Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 4 de 4
Filter
Add more filters










Database
Language
Publication year range
1.
Front Plant Sci ; 14: 1152817, 2023.
Article in English | MEDLINE | ID: mdl-37496856

ABSTRACT

Inherently, ammonium (NH4 +) is critical for plant growth; however, its toxicity suppresses potassium (K+) uptake and vice-versa. Hence, attaining a nutritional balance between these two ions (NH4 + and K+) becomes imperative for the growth of tobacco seedlings. Therefore, we conducted a 15-day experimental study on tobacco seedlings exposed to different concentrations (47 treatments) of NH4 +/K+ at different corresponding 12 ratios simultaneously in a hydroponic system. Our study aimed at establishing the optimal NH4 +-K+ concentration and the corresponding ratio required for optimal growth of different tobacco plant organs during the seedling stage. The controls were the baseline for comparison in this study. Plants with low or excessive NH4 +-K+ concentration had leaf chlorosis or dark greenish colouration, stunted whole plant part biomass, and thin roots. We found that adequate K+ supply is a pragmatic way to mitigate NH4 +-induced toxicity in tobacco plants. The optimal growth for tobacco leaf and root was attained at NH4 +-K+ concentrations 2-2 mM (ratio 1:1), whereas stem growth was optimal at NH4 +-K+ 1-2 mM (1:2). The study provided an insight into the right combination of NH4 +/K+ that could mitigate or prevent NH4 + or K+ stress in the tobacco seedlings.

2.
Plant Cell Environ ; 46(10): 3012-3022, 2023 10.
Article in English | MEDLINE | ID: mdl-35822392

ABSTRACT

Plants have evolved to deal with different stresses during plant growth, relying on complex interactions or crosstalk between multiple signalling pathways in plant cells. In this sophisticated regulatory network, Ca2+ transients in the cytosol ([Ca2+ ]cyt ) act as major physiological signals to initiate appropriate responses. The CALCINEURIN B-LIKE PROTEIN (CBL)-CBL-INTERACTING PROTEIN KINASE (CIPK) network relays physiological signals characterised by [Ca2+ ]cyt transients during plant development and in response to environmental changes. Many studies are aimed at elucidating the role of the CBL-CIPK network in plant growth and stress responses. This review discusses the involvement of the CBL-CIPK pathways in two levels of crosstalk between plant development and stress adaptation: direct crosstalk through interaction with regulatory proteins, and indirect crosstalk through adaptation of correlated physiological processes that affect both plant development and stress responses. This review thus provides novel insights into the physiological roles of the CBL-CIPK network in plant growth and stress adaptation.


Subject(s)
Arabidopsis , Protein Kinases , Protein Kinases/metabolism , Plant Proteins/metabolism , Arabidopsis/metabolism , Calcium-Binding Proteins/metabolism , Plant Development
3.
Food Res Int ; 157: 111262, 2022 07.
Article in English | MEDLINE | ID: mdl-35761574

ABSTRACT

Green tea is popularly known for its pleasant flavor and health-care functions. Bitterness and astringency are the two important quality attributes of green tea that enrich tea flavor. Although many research works have focused on the flavor formation of green tea, the review articles about bitterness and astringency is limited. This review article summarizes the major components of bitter and astringent substances in green tea, their sensory perception mechanism, factors influencing the formation of these substances, and the evaluation methods of bitterness and astringency. This review will shed light on the subsequent studies in tea flavor, and provide deeper insight for the research of bitterness and astringency in other foods.


Subject(s)
Astringents , Tea , Astringents/pharmacology , Humans , Perception , Sensation , Taste
4.
Front Plant Sci ; 12: 740976, 2021.
Article in English | MEDLINE | ID: mdl-34603362

ABSTRACT

Many tobacco (Nicotiana tabacum) cultivars are salt-tolerant and thus are potential model plants to study the mechanisms of salt stress tolerance. The CALCINEURIN B-LIKE PROTEIN (CBL) is a vital family of plant calcium sensor proteins that can transmit Ca2+ signals triggered by environmental stimuli including salt stress. Therefore, assessing the potential of NtCBL for genetic improvement of salt stress is valuable. In our studies on NtCBL members, constitutive overexpression of NtCBL5A was found to cause salt supersensitivity with necrotic lesions on leaves. NtCBL5A-overexpressing (OE) leaves tended to curl and accumulated high levels of reactive oxygen species (ROS) under salt stress. The supersensitivity of NtCBL5A-OE leaves was specifically induced by Na+, but not by Cl-, osmotic stress, or drought stress. Ion content measurements indicated that NtCBL5A-OE leaves showed sensitivity to the Na+ accumulation levels that wild-type leaves could tolerate. Furthermore, transcriptome profiling showed that many immune response-related genes are significantly upregulated and photosynthetic machinery-related genes are significantly downregulated in salt-stressed NtCBL5A-OE leaves. In addition, the expression of several cation homeostasis-related genes was also affected in salt-stressed NtCBL5A-OE leaves. In conclusion, the constitutive overexpression of NtCBL5A interferes with the normal salt stress response of tobacco plants and leads to Na+-dependent leaf necrosis by enhancing the sensitivity of transgenic leaves to Na+. This Na+ sensitivity of NtCBL5A-OE leaves might result from the abnormal Na+ compartmentalization, plant photosynthesis, and plant immune response triggered by the constitutive overexpression of NtCBL5A. Identifying genes and pathways involved in this unusual salt stress response can provide new insights into the salt stress response of tobacco plants.

SELECTION OF CITATIONS
SEARCH DETAIL
...