This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: Researchers have discovered a system that helps seeds survive when there is too much salt in the soil. The system helps young germinating embryos keep the right balance of sodium and potassium as they begin to grow.
Understanding how it works could eventually help scientists develop crops that grow better in salty soils. For a seed, germinating in salty soil can be a serious challenge. Too much salt makes it harder for the seed to absorb water and can disrupt the mineral balance it needs to germinate.
The study, published in The Plant Journal, by Dr. Doron Shkolnik at the Hebrew University of Jerusalem has revealed more about how seeds deal with this problem. The researchers studied Arabidopsis thaliana, a small plant from the mustard family commonly used in plant research.
They focused on how seeds maintain vital levels of potassium—an essential nutrient—while preventing toxic sodium from displacing it. Plants need potassium to keep their cells working properly. Too much sodium, however, can interfere with normal cell functions.
In salty soil, keeping the right balance between the two can determine whether a seed successfully germinates. The researchers found that applying calcium under salt stress conditions helps seeds maintain this critical balance. This calcium-mediated mechanism involves three key proteins: CAMTA6, PP2C49 and HKT1;1.
CAMTA6 responds to calcium signals by acting as a genetic switch, controlling the expression of the other system components. Importantly, these genes are not equally expressed everywhere in the embryo. Some are active in the embryonic leaves (cotyledons), while others are active in the embryonic root (radicle).
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