Scientists Find Hormone That Allows Seeds To Germinate In Low Water Conditions

Slashdot reader StellarThoughts shares an announcement from the University of California, Riverside. (Alternate URL):
Plants have the ability to perceive drought. When they do, they emit a hormone that helps them hold on to water. This same hormone, ABA, sends a message to seeds that it isn't a good time to germinate, leading to lower crop yields and less food in places where it's hot — an increasingly long list as a result of climate change.

'If you block ABA, you mess with the chemical pathway that plants use to prevent seed germination,' said Aditya Vaidya, UC Riverside project scientist and study author. 'Our new chemical, Antabactin, does exactly this. If we apply it, we have shown that dormant seeds will sprout.'

Demonstrations of Antabactin's effectiveness are described in a new paper published in the Proceedings of the National Academy of Sciences. This work builds on the same team's creation of a chemical that mimics the effects of the ABA hormone, produced by plants in response to drought stress. That chemical, Opabactin, slows a plant's growth so it conserves water and doesn't wilt. It works by inducing plants to close tiny pores in their leaves and stems, which prevents water from escaping. Next, the team wanted to find a molecule that would have the opposite effect, opening the pores, encouraging germination and increasing plant growth. Though seed dormancy has largely been removed through breeding, it is still a problem in some crops like lettuce. Sean Cutler, a UC Riverside plant cell biology professor and study co-author, said accelerating and slowing plant growth are important tools for farmers. 'Our research is all about managing both of these needs,' he said...

In their paper, the team members showed that applying Antabactin to barley and tomato seeds accelerated germination. Conceivably, both Antabactin and Opabactin could work together to help crops flourish in a world becoming drier and hotter. Once Antabactin has helped seeds sprout into healthy plants, a farmer might start saving water early in the growing season by spraying Opabactin. This way, enough water is 'banked' for when the plants start flowering.

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