The hormone abscisic acid in plants can help plants fight against drought and other harsh living conditions, but the scientific community knows very little about the specific mechanism of action of such plant hormones. Researchers in Spain and other countries have discovered the specific mechanism of abscisic acid to help plants resist drought, which has opened up new ideas for effectively improving plants' ability to resist drought.
Previous studies have found that under normal circumstances, a protein called PP2C in plants can prevent abscisic acid from functioning. When the plant is under extremely dry conditions, this blocking effect will disappear, and the abscisic acid in plant cells The content rises, which helps the plant resist drought. The study also believes that PP2C protein does not directly act on abscisic acid, but acts indirectly through another group of proteins. How these "intermediate proteins" coordinate the relationship between the two has always been the interest of researchers.
Researchers from the Spanish National Research Council and the European Molecular Biology Laboratory in France reported in the latest issue of the British journal Nature that they conducted a three-dimensional structural analysis of a protein called PYR1 among these "intermediate proteins" It was found that this protein is like a hand. When the amount of abscisic acid in the plant is low, the "hand" is in an open state, allowing the PP2C protein to prevent the abscisic acid from functioning. When a plant produces a large amount of abscisic acid due to environmental stimulation, this "hand" will close, hold the abscisic acid tightly, block the PP2C protein, and prevent it from affecting the role of abscisic acid.
The researchers point out that their research confirmed once again that the aforementioned "intermediate protein" is an important class of receptors for natural abscisic acid. Understanding the specific mechanism of its interaction with abscisic acid can more effectively help plants have stronger drought resistance.
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