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1.
Sci Rep ; 8(1): 17346, 2018 11 26.
Article in English | MEDLINE | ID: mdl-30478395

ABSTRACT

Seeds exhibit wide variation in the fatty acid composition of their storage oil. However, the genetic basis of this variation is only partially understood. Here we have used a multi-parent advanced generation inter-cross (MAGIC) population to study the genetic control of fatty acid chain length in Arabidopsis thaliana seed oil. We mapped four quantitative trait loci (QTL) for the quantity of the major very long chain fatty acid species 11-eicosenoic acid (20:1), using multiple QTL modelling. Surprisingly, the main-effect QTL does not coincide with FATTY ACID ELONGASE 1 and a parallel genome wide association study suggested that LYSOPHOSPHATIDYLCHOLINE ACYLTRANSFERASE 2 (LPCAT2) is a candidate for this QTL. Regression analysis also suggested that LPCAT2 expression and 20:1 content in seeds of the 19 MAGIC founder accessions are related. LPCAT is a key component of the Lands cycle; an acyl editing pathway that enables acyl-exchange between the acyl-Coenzyme A and phosphatidylcholine precursor pools used for microsomal fatty acid elongation and desaturation, respectively. We Mendelianised the main-effect QTL using biparental chromosome segment substitution lines and carried out complementation tests to show that a single cis-acting polymorphism in the LPCAT2 promoter causes the variation in seed 20:1 content, by altering the LPCAT2 expression level and total LPCAT activity in developing siliques. Our work establishes that oilseed species exhibit natural variation in the enzymic capacity for acyl editing and this contributes to the genetic control of storage oil composition.


Subject(s)
Arabidopsis/genetics , Fatty Acids/metabolism , Plant Oils/metabolism , Seeds/genetics , 1-Acylglycerophosphocholine O-Acyltransferase/genetics , 1-Acylglycerophosphocholine O-Acyltransferase/metabolism , Arabidopsis/metabolism , Arabidopsis Proteins/genetics , Arabidopsis Proteins/metabolism , Chromosome Mapping , Fatty Acid Elongases/genetics , Fatty Acid Elongases/metabolism , Fatty Acids/chemistry , Fatty Acids/genetics , Fatty Acids, Monounsaturated/metabolism , Gene Expression Regulation, Plant , Genetic Complementation Test , Genome-Wide Association Study , Plant Oils/chemistry , Plants, Genetically Modified , Promoter Regions, Genetic , Quantitative Trait Loci , Seeds/metabolism
2.
Plant J ; 89(1): 3-14, 2017 01.
Article in English | MEDLINE | ID: mdl-27595588

ABSTRACT

Coordination of endomembrane biogenesis with cell cycle progression is considered to be important in maintaining cell function during growth and development. We previously showed that the disruption of PHOSPHATIDIC ACID PHOSPHOHYDROLASE (PAH) activity in Arabidopsis thaliana stimulates biosynthesis of the major phospholipid phosphatidylcholine (PC) and causes expansion of the endoplasmic reticulum. Here we show that PC biosynthesis is repressed by disruption of the core cell cycle regulator CYCLIN-DEPENDENT KINASE A;1 (CDKA;1) and that this repression is reliant on PAH. Furthermore, we show that cyclin-dependent kinases (CDKs) phosphorylate PAH1 at serine 162, which reduces both its activity and membrane association. Expression of a CDK-insensitive version of PAH1 with a serine 162 to alanine substitution represses PC biosynthesis and also reduces the rate of cell division in early leaf development. Together our findings reveal a physiologically important mechanism that couples the rate of phospholipid biosynthesis and endomembrane biogenesis to cell cycle progression in Arabidopsis.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/metabolism , Cyclin-Dependent Kinases/metabolism , Phosphatidate Phosphatase/metabolism , Phosphatidylcholines/biosynthesis , Amino Acid Sequence , Arabidopsis/genetics , Arabidopsis/growth & development , Arabidopsis Proteins/genetics , Cell Cycle/genetics , Cyclin-Dependent Kinases/genetics , Endoplasmic Reticulum/genetics , Endoplasmic Reticulum/metabolism , Isoenzymes/genetics , Isoenzymes/metabolism , Mutation , Phosphatidate Phosphatase/genetics , Phosphorylation , Plant Leaves/genetics , Plant Leaves/growth & development , Plant Leaves/metabolism , Plants, Genetically Modified
3.
Plant Signal Behav ; 10(10): e1065367, 2015.
Article in English | MEDLINE | ID: mdl-26225871

ABSTRACT

Coordination of membrane lipid biosynthesis is important for cell function during plant growth and development. Here we summarize our recent work on PHOSPHATIDIC ACID PHOSPHOHYDROLASE (PAH) which suggests that this enzyme is a key regulator of phosphaticylcholine (PC) biosynthesis in Arabidopsis thaliana. Disruption of PAH activity elevates phosphatidic acid (PA) levels and stimulates PC biosynthesis and biogenesis of the endoplasmic reticulum (ER). Furthermore, the activity of PHOSPHOCHOLINE CYTIDYLYLTRANSFERASE (CCT), which is the key enzyme controlling the rate of PC biosynthesis, is directly stimulated by PA and expression of a constitutively active version of CCT replicates the effects of PAH disruption. Hence PAH activity can control the abundance of PA, which in turn can modulate CCT activity to govern the rate of PC biosynthesis. Crucially it is not yet clear how PAH activity is regulated in Arabidopsis but there is evidence that PAH1 and PAH2 are both phosphorylated and further work will be required to investigate whether this is functionally significant.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/metabolism , Choline-Phosphate Cytidylyltransferase/metabolism , Endoplasmic Reticulum/metabolism , Phosphatidate Phosphatase/metabolism , Phosphatidylcholines/metabolism , Hydrolases/metabolism , Membrane Lipids/biosynthesis , Phosphatidic Acids/metabolism , Phosphorylation
4.
Plant Cell ; 27(4): 1251-64, 2015 Apr.
Article in English | MEDLINE | ID: mdl-25862304

ABSTRACT

Regulation of membrane lipid biosynthesis is critical for cell function. We previously reported that disruption of PHOSPHATIDIC ACID PHOSPHOHYDROLASE1 (PAH1) and PAH2 stimulates net phosphatidylcholine (PC) biosynthesis and proliferation of the endoplasmic reticulum (ER) in Arabidopsis thaliana. Here, we show that this response is caused specifically by a reduction in the catalytic activity of the protein and positively correlates with an accumulation of its substrate, phosphatidic acid (PA). The accumulation of PC in pah1 pah2 is suppressed by disruption of CTP:PHOSPHOCHOLINE CYTIDYLYLTRANSFERASE1 (CCT1), which encodes a key enzyme in the nucleotide pathway for PC biosynthesis. The activity of recombinant CCT1 is stimulated by lipid vesicles containing PA. Truncation of CCT1, to remove the predicted C-terminal amphipathic lipid binding domain, produced a constitutively active enzyme. Overexpression of native CCT1 in Arabidopsis has no significant effect on PC biosynthesis or ER morphology, but overexpression of the truncated constitutively active version largely replicates the pah1 pah2 phenotype. Our data establish that membrane homeostasis is regulated by lipid composition in Arabidopsis and reveal a mechanism through which the abundance of PA, mediated by PAH activity, modulates CCT activity to govern PC content.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/enzymology , Arabidopsis/metabolism , Choline-Phosphate Cytidylyltransferase/metabolism , Phosphatidate Phosphatase/metabolism , Phosphorylcholine/metabolism , Arabidopsis Proteins/genetics , Choline-Phosphate Cytidylyltransferase/genetics , Phosphatidate Phosphatase/genetics
5.
Nat Commun ; 6: 6659, 2015 Apr 10.
Article in English | MEDLINE | ID: mdl-25858700

ABSTRACT

Gluconeogenesis is a fundamental metabolic process that allows organisms to make sugars from non-carbohydrate stores such as lipids and protein. In eukaryotes only one gluconeogenic route has been described from organic acid intermediates and this relies on the enzyme phosphoenolpyruvate carboxykinase (PCK). Here we show that two routes exist in Arabidopsis, and that the second uses pyruvate, orthophosphate dikinase (PPDK). Gluconeogenesis is critical to fuel the transition from seed to seedling. Arabidopsis pck1 and ppdk mutants are compromised in seed-storage reserve mobilization and seedling establishment. Radiolabelling studies show that PCK predominantly allows sugars to be made from dicarboxylic acids, which are products of lipid breakdown. However, PPDK also allows sugars to be made from pyruvate, which is a major product of protein breakdown. We propose that both routes have been evolutionarily conserved in plants because, while PCK expends less energy, PPDK is twice as efficient at recovering carbon from pyruvate.


Subject(s)
Arabidopsis/metabolism , Gene Expression Regulation, Plant , Gluconeogenesis/genetics , Phosphoenolpyruvate Carboxylase/metabolism , Pyruvate, Orthophosphate Dikinase/metabolism , Seedlings/metabolism , Seeds/metabolism , Arabidopsis/genetics , Arabidopsis/growth & development , Carbohydrates/biosynthesis , Carbon/metabolism , Dicarboxylic Acids/metabolism , Lipid Metabolism/genetics , Mutation , Phosphoenolpyruvate Carboxylase/genetics , Pyruvate, Orthophosphate Dikinase/genetics , Pyruvic Acid/metabolism , Seedlings/genetics , Seedlings/growth & development , Seeds/genetics , Seeds/growth & development , Signal Transduction
6.
Plant Physiol ; 161(1): 72-80, 2013 Jan.
Article in English | MEDLINE | ID: mdl-23166353

ABSTRACT

Jojoba (Simmondsia chinensis) is the only plant species known to use liquid wax esters (WEs) as a primary seed storage reserve. Upon germination, WE hydrolysis releases very-long-chain fatty alcohols, which must be oxidized to fatty acids by the sequential action of a fatty alcohol oxidase (FAO) and a fatty aldehyde dehydrogenase (FADH) before they can be ß-oxidized. Here, we describe the cloning and characterization of genes for each of these two activities. Jojoba FAO and FADH are 52% and 68% identical to Arabidopsis (Arabidopsis thaliana) FAO3 and ALDH3H1, respectively. The genes are expressed most strongly in the cotyledons of jojoba seedlings following germination, but transcripts can also be detected in vegetative tissues. Proteomic analysis indicated that the FAO and FADH proteins can be detected on wax bodies, but they localized to the endoplasmic reticulum when they were expressed as amino-terminal green fluorescent protein fusions in tobacco (Nicotiana tabacum) leaves. Recombinant jojoba FAO and FADH proteins are active on very-long-chain fatty alcohol and fatty aldehyde substrates, respectively, and have biochemical properties consistent with those previously reported in jojoba cotyledons. Coexpression of jojoba FAO and FADH in Arabidopsis enhanced the in vivo rate of fatty alcohol oxidation more than 4-fold. Taken together, our data suggest that jojoba FAO and FADH constitute the very-long-chain fatty alcohol oxidation pathway that is likely to be necessary for efficient WE mobilization following seed germination.


Subject(s)
Fatty Alcohols/metabolism , Germination , Seeds/metabolism , Waxes/metabolism , Alcohol Oxidoreductases/genetics , Alcohol Oxidoreductases/metabolism , Aldehyde Oxidoreductases/metabolism , Arabidopsis/enzymology , Arabidopsis/genetics , Cloning, Molecular , Cotyledon/genetics , Cotyledon/metabolism , Endoplasmic Reticulum/metabolism , Enzyme Activation , Esters/metabolism , Gene Expression Regulation, Enzymologic , Gene Expression Regulation, Plant , Genes, Plant , Magnoliopsida/enzymology , Magnoliopsida/genetics , Oxidation-Reduction , Plant Leaves/enzymology , Plant Leaves/genetics , Plants, Genetically Modified/enzymology , Plants, Genetically Modified/genetics , Proteomics/methods , Recombinant Fusion Proteins/genetics , Recombinant Fusion Proteins/metabolism , Seeds/genetics , Nicotiana/enzymology , Nicotiana/genetics
7.
Front Plant Sci ; 3: 219, 2012.
Article in English | MEDLINE | ID: mdl-23060890

ABSTRACT

To take up proteins and other components required by the cell, cells internalize a portion of the plasma membrane (PM), which invaginates to form a closed vesicle within the cytoplasm in a process known as endocytosis. The major plant endocytic mechanism is mediated by clathrin, a protein that is necessary to generate a coated vesicle on the inner side of the PM. These vesicles bud away from the membrane generating a vesicle whose contents originated from outside of the cell and they can selectively concentrate or exclude compounds. The process is therefore of key importance to plant growth, development, signaling, polarity, and nutrient delivery. Rho family small GTPases are conserved molecular switches that function in many signaling events. Plants possess only a single Rho-like GTPase (ROP) family. ROPs are known to be involved in the control of cell polarity by regulating endocytosis. To contend with the high levels of regulation required for such processes, plants have evolved specific regulators, including the Rop-interactive CRIB motif-containing protein (RIC) effectors. Recent findings have demonstrated that ROP dynamics and the cytoskeleton (including actin microfilaments and microtubules) are interwoven. In this review, we summarize the current understanding of endocytosis in plants, with particular regard to the signaling pathways.

8.
Trends Cell Biol ; 22(9): 492-501, 2012 Sep.
Article in English | MEDLINE | ID: mdl-22795444

ABSTRACT

In animal and plant cells, a wide range of key cellular processes that require the establishment of cell polarity are governed by Rho-GTPases. In contrast to animals and yeast, however, plants possess a single Rho-GTPase subfamily called Rho-like GTPases from plants (ROPs). This raises the question of how plants achieve the high level of regulation required for polar cellular processes. It is becoming evident that plants have evolved specific regulators, including ROP-Guanine Exchange Factors (GEFs) and the Rop-interactive CRIB motif-containing protein (RIC) effectors. Recent research shows that the spatiotemporal dynamics of ROPs, the cytoskeleton, endocytosis, and exocytosis are intertwined. This review focuses on the proposed self-organizing nature of ROPs in plants and how ROP-mediated cellular mechanisms compare with those responsible for cell polarity in animals and yeast.


Subject(s)
GTP Phosphohydrolases/metabolism , Plants/metabolism , Signal Transduction , Animals , Humans , Protein Processing, Post-Translational , rho GTP-Binding Proteins/metabolism
9.
Plant J ; 71(5): 836-49, 2012 Sep.
Article in English | MEDLINE | ID: mdl-22540321

ABSTRACT

Pentatricopeptide repeat (PPR) proteins belong to a family of approximately 450 members in Arabidopsis, of which few have been characterized. We identified loss of function alleles of SLO2, defective in a PPR protein belonging to the E+ subclass of the P-L-S subfamily. slo2 mutants are characterized by retarded leaf emergence, restricted root growth, and late flowering. This phenotype is enhanced in the absence of sucrose, suggesting a defect in energy metabolism. The slo2 growth retardation phenotypes are largely suppressed by supplying sugars or increasing light dosage or the concentration of CO2. The SLO2 protein is localized in mitochondria. We identified four RNA editing defects and reduced editing at three sites in slo2 mutants. The resulting amino acid changes occur in four mitochondrial proteins belonging to complex I of the electron transport chain. Both the abundance and activity of complex I are highly reduced in the slo2 mutants, as well as the abundance of complexes III and IV. Moreover, ATP, NAD+, and sugar contents were much lower in the mutants. In contrast, the abundance of alternative oxidase was significantly enhanced. We propose that SLO2 is required for carbon energy balance in Arabidopsis by maintaining the abundance and/or activity of complexes I, III, and IV of the mitochondrial electron transport chain.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/metabolism , Electron Transport Complex I/metabolism , Energy Metabolism , Mitochondrial Proteins/metabolism , RNA Editing , Adenosine Triphosphate/metabolism , Amino Acid Substitution , Arabidopsis/genetics , Arabidopsis Proteins/genetics , Cloning, Molecular , Electron Transport Complex I/genetics , Gene Expression Regulation, Plant , Mitochondria/metabolism , Mitochondrial Proteins/genetics , NAD/metabolism , Phenotype , Sucrose/metabolism
10.
Plant Signal Behav ; 6(4): 526-7, 2011 Apr.
Article in English | MEDLINE | ID: mdl-21406976

ABSTRACT

Phospholipids make up the bulk of most eukaryotic cell membranes, but how their synthesis is regulated remains relatively poorly understood in plants. In our article1 we provide evidence that two Mg ( 2+) -dependent phosphatidic acid phosphatase enzymes, called PAH1 and PAH2, are capable of repressing phospholipid biosynthesis at the endoplasmic reticulum in Arabidopsis thaliana. The precise mechanism of repression remains unclear and it does appear to vary in several respects from that already described in Saccharomyces cerevisiae. ( 2,3).


Subject(s)
Arabidopsis/metabolism , Membrane Lipids/metabolism , Phosphatidate Phosphatase/metabolism , Arabidopsis/genetics , Endoplasmic Reticulum/metabolism , Mutation , Phosphatidate Phosphatase/genetics , Plants, Genetically Modified/genetics , Plants, Genetically Modified/metabolism
11.
Plant J ; 64(3): 411-8, 2010 Nov.
Article in English | MEDLINE | ID: mdl-20969742

ABSTRACT

Reticulons are integral endoplasmic reticulum (ER) membrane proteins that have the ability to shape the ER into tubules. It has been hypothesized that their unusually long conserved hydrophobic regions cause reticulons to assume a wedge-like topology that induces membrane curvature. Here we provide proof of this hypothesis. When over-expressed, an Arabidopsis thaliana reticulon (RTNLB13) localized to, and induced constrictions in, cortical ER tubules. Ectopic expression of RTNLB13 was sufficient to induce ER tubulation in an Arabidopsis mutant (pah1 pah2) whose ER membrane is mostly present in a sheet-like form. By sequential shortening of the four transmembrane domains (TMDs) of RTNLB13, we show that the length of the transmembrane regions is directly correlated with the ability of RTNLB13 to induce membrane tubulation and to form low-mobility complexes within the ER membrane. We also show that full-length TMDs are necessary for the ability of RTNLB13 to reside in the ER membrane.


Subject(s)
Arabidopsis Proteins/chemistry , Arabidopsis/chemistry , Endoplasmic Reticulum/metabolism , Membrane Proteins/chemistry , Microtubules/metabolism , Nicotiana/chemistry , Nicotiana/genetics
12.
Plant Cell ; 22(8): 2796-811, 2010 Aug.
Article in English | MEDLINE | ID: mdl-20699392

ABSTRACT

Phospholipid biosynthesis is essential for the construction of most eukaryotic cell membranes, but how this process is regulated in plants remains poorly understood. Here, we show that in Arabidopsis thaliana, two Mg(2+)-dependent phosphatidic acid phosphohydrolases called PAH1 and PAH2 act redundantly to repress phospholipid biosynthesis at the endoplasmic reticulum (ER). Leaves from pah1 pah2 double mutants contain ~1.8-fold more phospholipid than the wild type and exhibit gross changes in ER morphology, which are consistent with massive membrane overexpansion. The net rate of incorporation of [methyl-(14)C]choline into phosphatidylcholine (PC) is ~1.8-fold greater in the double mutant, and the transcript abundance of several key genes that encode enzymes involved in phospholipid synthesis is increased. In particular, we show that PHOSPHORYLETHANOLAMINE N-METHYLTRANSFERASE1 (PEAMT1) is upregulated at the level of transcription in pah1 pah2 leaves. PEAMT catalyzes the first committed step of choline synthesis in Arabidopsis and defines a variant pathway for PC synthesis not found in yeasts or mammals. Our data suggest that PAH1/2 play a regulatory role in phospholipid synthesis that is analogous to that described in Saccharomyces cerevisiae. However, the target enzymes differ, and key components of the signal transduction pathway do not appear to be conserved.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/enzymology , Endoplasmic Reticulum/enzymology , Phosphatidate Phosphatase/metabolism , Phospholipids/biosynthesis , Amino Acid Sequence , Arabidopsis/genetics , Arabidopsis Proteins/genetics , Cloning, Molecular , Molecular Sequence Data , Phosphatidate Phosphatase/genetics , RNA, Plant/genetics , Sequence Alignment
13.
Traffic ; 9(3): 408-16, 2008 Mar.
Article in English | MEDLINE | ID: mdl-18194392

ABSTRACT

The plant vacuolar sorting receptor (VSR) binds proteins carrying vacuolar sorting signals (VSS) of the 'sequence-specific' type (ssVSS) but not the C-terminal, hydrophobic sorting signals (ctVSS). Seeds of Arabidopsis mutants lacking the major VSR isoform, AtVSR1, secrete a proportion of the proteins destined to storage vacuoles. The sorting signals for these proteins are not well defined, but they do not seem to be of the ssVSS type. Here, we tested whether absence of VSR1 in seeds leads to secretion of reporter proteins carrying ssVSS but not ctVSS. Our results show that reporters carrying either ssVSS or ctVSS are equally secreted in the absence of VSR1. We discuss our findings in relation to the current model for vacuolar sorting.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/genetics , Arabidopsis/metabolism , Arabidopsis Proteins/genetics , Base Sequence , DNA, Plant/genetics , Genes, Plant , Genes, Reporter , Models, Biological , Mutation , Plant Proteins/genetics , Plant Proteins/metabolism , Plants, Genetically Modified , Seeds/metabolism , Solubility , Vacuoles/metabolism
14.
Traffic ; 9(1): 94-102, 2008 Jan.
Article in English | MEDLINE | ID: mdl-17980018

ABSTRACT

We have cloned a member of the reticulon (RTN) family of Arabidopsis thaliana (RTNLB13). When fused to yellow fluorescent protein (YFP) and expressed in tobacco leaf epidermal cells, RTNLB13 is localized in the endoplasmic reticulum (ER). Coexpression of a soluble ER luminal marker reveals that YFP-tagged, myc-tagged or untagged RTNLB13 induces severe morphological changes to the lumen of the ER. We show, using fluorescence recovery after photobleaching (FRAP) analysis, that RTNLB13 overexpression greatly reduces diffusion of soluble proteins within the ER lumen, possibly by introducing constrictions into the membrane. In spite of this severe phenotype, Golgi shape, number and dynamics appear unperturbed and secretion of a reporter protein remains unaffected.


Subject(s)
Arabidopsis Proteins/biosynthesis , Arabidopsis/metabolism , Endoplasmic Reticulum/metabolism , Arabidopsis/ultrastructure , Endoplasmic Reticulum/ultrastructure , Fluorescence Recovery After Photobleaching , Golgi Apparatus/metabolism , Golgi Apparatus/ultrastructure , Microscopy, Confocal , Phylogeny , Protein Transport , Recombinant Proteins/metabolism
15.
Plant Physiol ; 145(4): 1371-82, 2007 Dec.
Article in English | MEDLINE | ID: mdl-17905861

ABSTRACT

We generated fusions between three Arabidopsis (Arabidopsis thaliana) tonoplast intrinsic proteins (TIPs; alpha-, gamma-, and delta-TIP) and yellow fluorescent protein (YFP). We also produced soluble reporters consisting of the monomeric red fluorescent protein (RFP) and either the C-terminal vacuolar sorting signal of phaseolin or the sequence-specific sorting signal of proricin. In transgenic Arabidopsis leaves, mature roots, and root tips, all TIP fusions localized to the tonoplast of the central vacuole and both of the lumenal RFP reporters were found within TIP-delimited vacuoles. In embryos from developing, mature, and germinating seeds, all three TIPs localized to the tonoplast of protein storage vacuoles. To determine the temporal TIP expression patterns and to rule out mistargeting due to overexpression, we generated plants expressing YFP fused to the complete genomic sequences of the three TIP isoforms. In transgenic Arabidopsis, gamma-TIP expression was limited to vegetative tissues, but specifically excluded from root tips, whereas alpha-TIP was exclusively expressed during seed maturation. delta-TIP was expressed in vegetative tissues, but not root tips, at a later stage than gamma-TIP. Our findings indicate that, in the Arabidopsis tissues analyzed, two different vacuolar sorting signals target soluble proteins to a single vacuolar location. Moreover, TIP isoform distribution is tissue and development specific, rather than organelle specific.


Subject(s)
Arabidopsis/ultrastructure , Membrane Proteins/metabolism , Plant Proteins/metabolism , Vacuoles/ultrastructure , Arabidopsis/growth & development , Arabidopsis/metabolism , Biomarkers/metabolism , Gene Expression Regulation, Developmental , Genes, Reporter , Luminescent Proteins/metabolism , Plant Leaves/metabolism , Plant Roots/metabolism , Protein Engineering , Protein Isoforms/metabolism , Seeds/metabolism , Vacuoles/metabolism
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