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Plants have developed mechanisms to adapt to the potassium deficient conditions over the years. In  Arabidopsis thaliana , expression of a potassium transporter HAK5 is induced in low potassium conditions as an adaptive response to nutrient deficiency. In order to understand the mechanism in which  HAK5  is regulated, the full-length cDNA overexpressor gene hunting system was employed as a screening method. Of 40 genes recovered, At4g18280 was found to be dramatically induced in response to potassium-deficiency and salt stress. Plants overexpressing this gene showed higher  HAK5  expression and enhanced growth. These plants were also less sensitive to potassium-deficiency in terms of primary root growth. Taken together, these data suggest that this novel component, At4g18280, contributes to regulation of  HAK5  and, consequently, tolerance to potassium-deficiency in plants.

Overexpression of a Novel Component Induces HAK5 and Enhances Growth in Arabidopsis