The Arabidopsis F-box protein FOF2 regulates ABA-mediated seed germination and drought tolerance.

Plant Science : an International Journal of Experimental Plant Biology
Lina QuXiaoying Zhao

Abstract

The phytohormone abscisic acid (ABA) plays a crucial role at various plant developmental stages, including seed germination and seedling development, and regulates stomatal aperture in response to drought. However, the underlying mechanisms are not well understood. Here, we showed that F-BOX OF FLOWERING 2 (FOF2) is induced by ABA and drought stress. Overexpression of FOF2 led to reduced ABA sensitivity during seed germination and early seedling development, whereas the fof2 mutant exhibited increased sensitivity to ABA. Molecular and genetic analyses revealed that FOF2 negatively affected ABA-mediated seed germination and early seedling development partially by repressing the expression of the ABA-signaling genes ABI3 and ABI5. Additionally, we found that FOF2-overexpressing plants exhibited increased ABA contents, enhanced ABA sensitivity during stomatal closure, and decreased water loss, thereby improving tolerance to drought stress, in contrast to the fof2 mutant. Consistent with a higher ABA content and enhanced drought tolerance, the expression of ABA- and drought-induced genes and the ABA-biosynthesis gene NCED3 was upregulated in the FOF2-overexpressing plants but downregulated in fof2 mutant in response to drought stre...Continue Reading

Citations

May 1, 2021·International Journal of Molecular Sciences·Agnieszka SirkoMarzena Sieńko
Jul 29, 2021·Plant Science : an International Journal of Experimental Plant Biology·Xinmei LiXiaoying Zhao

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