Identification and expression analysis of the YABBY gene family in strawberry / 生物工程学报

YABBY proteins are important transcription factors that regulate morphogenesis and organ development in plants. In order to study the YABBY of strawberry, bioinformatic technique were used to identify the YABBY gene families in Fragaria vesca (diploid) and Fragaria×ananassa (octoploid), and then analyze the sequence characters, phylogeny and collinearity of the family members. The RNA-seq data and the quantitative reverse transcription-polymerase chain reaction (qRT-PCR) technique were used to assay the expression patterns of the family members. A green fluorescent protein (GFP) was fused with FvYABBYs and transiently expressed in tobacco leaf cells for the subcellular localization. As the results, six FvYABBY genes and 26 FxaYABBY genes were identified from F. vesca and F.×ananassa, respectively. The FvYABBY genes were grouped into five clades, and five family members were orthologous with AtYABBY genes of Arabidopsis. In F. vesca, all of the FvYABBYs were basically not expressed not expressed in root and receptacle, while FvYABBY1, FvYABBY2, FvYABBY5 and FvYABBY6 were highly expressed in leaf, shoot, flower and achene. In F.×ananassa, FxaYABBY1, FxaYABBY2, FxaYABBY5 and FxaYABBY6 were expressed in achene, and all FxaYABBY were poorly or not expressed in receptacle. Additionally, under the abiotic stresses of low temperature, high salt and drought, the expression of FvYABBY1, FvYABBY3, FvYABBY4 and FvYABBY6 were down-regulated, FvYABBY5 was up-regulated, and FvYABBY2 was up-regulated and then down-regulated. In tobacco leaf cells, the subcellular localization of FvYABBY proteins were in the nucleus. These results provides a foundation for the functional researches of YABBY gene in strawberry.

Genome-wide identification of SUN gene family in Fragaria vesca and stresses-response analysis / 生物工程学报

SUN gene is a group of key genes regulating plant growth and development. Here, SUN gene families of strawberry were identified from the genome of the diploid Fragaria vesca, and their physicochemical properties, genes structure, evolution and genes expression were also analyzed. Our results showed that there were thirty-one FvSUN genes in F. vesca and the FvSUNs encoded proteins were classified into seven groups, and the members in the same group showed high similarity in gene structures and conservative motifs. The electronic subcellular localization of FvSUNs was mainly in the nucleus. Collinearity analysis showed that the members of FvSUN gene family were mainly expanded by segmental duplication in F. vesca, and Arabidopsis and F. vesca shared twenty-three pairs of orthologous SUN genes. According to the expression pattern in different tissues shown by the transcriptome data of F. vesca, the FvSUNs gene can be divided into three types: (1) expressed in nearly all tissues, (2) hardly expressed in any tissues, and (3) expressed in special tissues. The gene expression pattern of FvSUNs was further verified by quantitative real-time polymerase chain reaction (qRT-PCR). Additionally, the seedlings of F. vesca were treated by different abiotic stresses, and the expression level of 31 FvSUNs genes were assayed by qRT-PCR. The expression of most of the tested genes was induced by cold, high salt or drought stress. Our studies may facilitate revealing the biological function and molecular mechanism of SUN genes in strawberry.

[Epigenetic variation and its application in crop improvement].

Heritable variations in natural populations, including genetic variation and epigenetic variation, are the motivation for adaptation and evolution of plant species. Germplasm can be transferred stably from generation to generation by mitosis and/or meiosis without alteration in DNA sequence and protein expression. Here, two important sources of epigenetic variation, distant hybridization and polyploidy, and various biotic and abiotic stresses, are introduced. The application of epigenetic variation in crop improvement and its limitation, as well as optional solutions, are also summarized.

RAPD analysis of genetic polymorphism and molecular identification of Citrus medica cv. sarcodactylis from Jinhua / 中草药

Object To analyse genetic polymorphism in DNA level of three species and determine them in molecular level by using of the optimization of Citrus medica cv. sarcodactylis (Noot.) Swingle RAPD reaction.Methods RAPD reactions were performed under the following conditions:template DNA 10～100 ng/?L, 3.0～5.0 mmol/L MgCl 2, 200 ?mol/L dNTP,0.2 ?mol/L 10 mer Primer, lunit Taq Polymerase/25 ?L reaction volume.Results Twelve efficient and stable primers were selected from 38 primers. Phenograms were constructed by using genetic distance UPGMA method. Based on the results of the RAPD analysis and on a review of morphological characterisitic, C. medica cv. sarcodactylis species BAIHUAQINGPI could be used as BAIHUABAIPI in three species, there were some special amplified bands in every RAPD reactions from different species. Conclusion This method could serve as an easy and highly efficient method for C. medica cv. sarcodactylis genetic polymorphism and molecular identification of species.