Yu Diqiu Research Group of Xishuangbanna Tropical Botanical Garden of Chinese Academy of Sciences is dedicated to researching important functional genes and their signaling molecules for improving crop stress resistance to exogenous stress factors. The latest research found that the plant hormone jasmonic acid can enhance the antifreeze reaction of Arabidopsis thaliana, and use Agilent expression profile chip to extract jasmonic acid to improve the freeze-resistance response of plants through multiple signaling pathways. The results were published in the top magazine The Plant Cell.
Research Background:
Cold stress is one of the important environmental factors affecting plant distribution and crop yield. It reveals how the plant adapts to the molecular mechanism of low temperature stress and has a profound impact on agricultural production. The plant hormone Jasmonate is an important type of growth regulation. Hormones, widely involved in the regulation of various physiological processes of plants, such as elongation of roots, accumulation of anthocyanins, development of epidermal hair, plant senescence and disease resistance, etc., but whether jasmonic acid is involved in the regulation of low temperature resistance of plants and The corresponding molecular mechanisms remain to be revealed.
Cold stress is one of the important environmental factors affecting plant distribution and crop yield. It reveals how the plant adapts to the molecular mechanism of low temperature stress and has a profound impact on agricultural production. The plant hormone Jasmonate is an important type of growth regulation. Hormones, widely involved in the regulation of various physiological processes of plants, such as elongation of roots, accumulation of anthocyanins, development of epidermal hair, plant senescence and disease resistance, etc., but whether jasmonic acid is involved in the regulation of low temperature resistance of plants and The corresponding molecular mechanisms remain to be revealed.
Research ideas:
The researchers found that exogenous application of jasmonic acid significantly increased the antifreeze ability of plants; blocking the synthesis and signal transduction of endogenous jasmonic acid in plants caused plants to be sensitive to freezing damage, indicating that jasmonic acid can promote low temperature resistance of plants. Further studies revealed that JAZ, a jasmonic acid signaling pathway inhibitor, interacts with the key signaling factors ICE1 and ICE2 of the cold signaling pathway ICE–CBF/DREB1, and inhibits the expression of CBF/DREB1 and its downstream low-temperature response genes. The jasmonic acid receptor Coi1-1 can degrade JAZ, thereby activating the transcriptional activity of ICE1 and promoting the expression of CBF/DREB1 and its downstream low-temperature response genes.
In addition to the ICE–CBF/DREB1 signaling pathway, does jasmonate regulate plant chilling resistance through other pathways? Using Agilent expression profiling chips to detect expression profiles of Coi1-1 mutant and wild-type Arabidopsis thaliana under low temperature conditions, the Coi1-1 mutation resulted in down-regulation of many low-temperature response genes, including the ICE–CBF/DREB1 signaling pathway gene and others. Signal pathway genes and secondary metabolite synthetase genes. Therefore, jasmonic acid enhances plant low temperature resistance by regulating the ICE–CBF/DREB1 signaling pathway and other signaling pathways.
Significance:
This study found a new plant anti-cold damage molecule, jasmonic acid, for systematically studying the molecular biological mechanism and signal pathway of plant resistance to abiotic stress, revealing the molecular biological network of plant stress response, and mining can effectively It is of great significance to improve the important functional genes and signal molecules of crops against exogenous stress factors. The clarification of their functions and functional mechanisms is of great value in coping with environmental changes, especially the impact of low temperature freezing damage on agricultural production.
This study found a new plant anti-cold damage molecule, jasmonic acid, for systematically studying the molecular biological mechanism and signal pathway of plant resistance to abiotic stress, revealing the molecular biological network of plant stress response, and mining can effectively It is of great significance to improve the important functional genes and signal molecules of crops against exogenous stress factors. The clarification of their functions and functional mechanisms is of great value in coping with environmental changes, especially the impact of low temperature freezing damage on agricultural production.
Original source:
Jasmonate Regulates the INDUCER OF CBF EXPRESSION–C-REPEAT BINDING FACTOR/DRE BINDING FACTOR1 Cascade and Freezing Tolerance in Arabidopsis. The Plant Cell. 2013.
Jasmonate Regulates the INDUCER OF CBF EXPRESSION–C-REPEAT BINDING FACTOR/DRE BINDING FACTOR1 Cascade and Freezing Tolerance in Arabidopsis. The Plant Cell. 2013.
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