Famous scholar Zhu Health Professor PNAS published new results
Abscisic acid (ABA) is one of the most important hormones in plants. It has a close relationship with seed dormancy, root development, leaf withering, drought resistance and other physiological processes. Recently, the research team of the Shanghai Institute of Life Sciences of the Chinese Academy of Sciences and Purdue University revealed a negative regulation mechanism of abscisic acid signaling. This result was recently published in the Proceedings of the National Academy of Sciences PNAS. The author of the article is the Shanghai Plant Adversity of the Chinese Academy of Sciences. Professor Jian-Kang Zhu of the Center for Biological Research. Abscisic acid plays an important role in the adaptation of plants to environmental stress. Drought stress induces the accumulation of abscisic acid in plants, and then abscisic acid rapidly activates the protein kinase OST1/SnRK2.6, which phosphorylates a large number of proteins in guard cells, thereby closing the pores and reducing the water loss of transpiration. The researchers found that abscisic acid can cause guard cells to produce nitric oxide (NO), which causes S-nitrosylation of a cysteine ​​residue near the catalytic site of SnRK2.6 kinase, thereby blocking SnRK2.6. Kinase activity. Studies have shown that S-nitrosoglutathione reductase (GSNO reductase) dysfunction, leading to the accumulation of excessive GSNO in guard cells, SnRK2.6 sustained S-nitrosylation, the result is stomatal regulation of abscisic acid The signal is not sensitive. The article pointed out that several protein kinases in yeast and humans also have similar cysteine ​​residues, and these residues can be S-nitrosylated, indicating that S-nitrosylation may be an evolutionarily conservative Protein kinase regulatory machinery.
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