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• W3047871946 endingPage "104228" @default.
• W3047871946 startingPage "104228" @default.
• W3047871946 abstract "Cold stress inhibits plant growth and ultimately affects yield formation. Exogenous 5- aminolevulinic acid (ALA) can improve tomato cold tolerance and promote plant growth. It significantly up-regulated glutamate decarboxylase gene (SlGAD4) expression, which was involved in gamma-aminobutyric acid (GABA) synthesis. Whether the GABA was involved in ALA-regulated tomato cold tolerance and plant growth was unclear. Thus, this study aimed to explore the effects of exogenous ALA and GABA on endogenous ALA and GABA synthesis. The roles of ALA and GABA on regulating the antioxidation and cell morphological changes related to plant growth in tomato leaves were further explored. And the internal relationship between ALA and GABA in increasing tomato cold tolerance was also determined. Results showed that cold stress increased the glutamate (Glu) and GABA contents and reduced the ALA content. The exogenous ALA- or GABA-treated plants demonstrated decreased Glu content and increased GABA or ALA contents. Exogenous ALA or GABA treatment promoted the expansion of upper epidermal (UEP) and palisade parenchymal (PA) cells and up-regulated the xyloglucan endotransglucosylase/hydrolases gene (SlXTH23) expression in tomato leaves. Exogenous ALA or GABA significantly alleviated cold-induced tomato membrane lipid peroxidation and enhanced C-repeat binding factors gene (SlCBF2) expression and superoxide dismutase (SOD), catalase (CAT), APX and GR activities. Inhibiting endogenous GABA with 3-mercaptopropionic (3-mp) dramatically decreased the size of UEP and PA cells and reduced SOD and CAT activities. It also aggravated the membrane peroxidation damage, which notably weakened the alleviated effects of exogenous ALA. Inhibiting endogenous ALA with gabaculine (gaba) partly inhibited the alleviated effects of exogenous GABA. These findings indicated that spray with exogenous ALA or GABA could increase endogenous ALA and GABA levels in tomato leaves. In addition, endogenous GABA and ALA could be mutually converted through Glu. Exogenous ALA and GABA promoted cell expansion, stimulated the antioxidant system and might enhance tomato cold tolerance via endogenous GABA signal and the C-repeat binding factor regulation pathway, thereby alleviating cold inhibited plant growth. In conclusion, GABA crosstalk with ALA improved tomato cold stress tolerance and promoted plant growth by regulating antioxidants and cell expansion." @default.
• W3047871946 created "2020-08-13" @default.
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• W3047871946 date "2020-12-01" @default.
• W3047871946 modified "2023-09-27" @default.
• W3047871946 title "Crosstalk between GABA and ALA to improve antioxidation and cell expansion of tomato seedling under cold stress" @default.
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• W3047871946 doi "https://doi.org/10.1016/j.envexpbot.2020.104228" @default.
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