Exogenous γ-aminobutyric acid (GABA) provides a carbon skeleton to promote the accumulation of sugar and unsaturated fatty acids in vegetable soybean seeds

IF 4.5 2区 生物学 Q2 ENVIRONMENTAL SCIENCES
Fengqiong Chen , Yating Wang , Yiyang Liu , Qiusen Chen , Hanlin Liu , Jin Tian , Mengxue Wang , Chunyuan Ren , Qiang Zhao , Fengjun Yang , Jinpeng Wei , Gaobo Yu , Yuxian Zhang
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引用次数: 0

Abstract

γ-aminobutyric acid (GABA) influences various physiological processes in plants, particularly in carbon and nitrogen metabolism. However, the mechanism underlying carbon (sucrose and unsaturated fatty acid) metabolism in vegetable soybeans was still unknown. In this study, a foliar spray of GABA (10 mM) elevated the level of Ca2+ by up-regulating the expression of calmodulin (GmCaM), which increased glutamate decarboxylase (GAD) activity and boosted endogenous GABA content. This, in turn, enhanced the expression of coding genes of GABA transferase (GmGABA-T) and succinic semialdehyde dehydrogenase (GmSSADH), as well as the activity of GABA transferase (GABA-T), activated the GABA shunt to supply carbon to the tricarboxylic acid (TCA) cycle, thus improved carbon metabolism. The gene expression and activity of sucrose metabolism-related enzymes were also enhanced, leading to the increased accumulation of total soluble sugars, sucrose, glucose, etc. Additionally, exogenous GABA treatment elevated the level of unsaturated fatty acids, including omega-3 arachidonic acid, linoleic acid, alpha-linolenic acid, etc. However, these effects were attenuated by 3-mercaplopropionic acid (3-MP), an inhibitor of GABA synthesis. In summary, exogenous GABA provides a carbon skeleton that promotes the accumulation of sugar and unsaturated fatty acids in vegetable soybean seeds. This research provides a valuable theory for further improving the yield and quality of vegetable soybeans.
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来源期刊
Environmental and Experimental Botany
Environmental and Experimental Botany 环境科学-环境科学
CiteScore
9.30
自引率
5.30%
发文量
342
审稿时长
26 days
期刊介绍: Environmental and Experimental Botany (EEB) publishes research papers on the physical, chemical, biological, molecular mechanisms and processes involved in the responses of plants to their environment. In addition to research papers, the journal includes review articles. Submission is in agreement with the Editors-in-Chief. The Journal also publishes special issues which are built by invited guest editors and are related to the main themes of EEB. The areas covered by the Journal include: (1) Responses of plants to heavy metals and pollutants (2) Plant/water interactions (salinity, drought, flooding) (3) Responses of plants to radiations ranging from UV-B to infrared (4) Plant/atmosphere relations (ozone, CO2 , temperature) (5) Global change impacts on plant ecophysiology (6) Biotic interactions involving environmental factors.
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