Arabidopsis VQ18 and VQ26 proteins interact with ABI5 transcription factor to negatively modulate ABA response during seed germination

The Plant Journal : for Cell and Molecular Biology
Jinjing PanDiqiu Yu

Abstract

Seed germination and early seedling establishment, critical developmental stages in the life cycle of seed plants, are modulated by diverse endogenous hormones and the surrounding environment. Arabidopsis ABSCISIC ACID-INSENSITIVE5 (ABI5) is a central transcription factor of abscisic acid (ABA) signaling that represses those processes. ABI5 is precisely modulated at post-translational level; however, whether it interacts with other crucial transcriptional regulators remains to be investigated. In this study, VQ18 and VQ26, two members of the recently-identified VQ family, were found to interact with ABI5 in vitro and in vivo. Phenotypic analysis showed that VQ18 and VQ26 are responsive to ABA and negatively mediate ABA signaling redundantly during seed germination. Simultaneously decreasing VQ18 and VQ26 expression levels enhanced ABA signaling to suppress seed germination, whereas overexpressing these two VQ genes resulted in the germinated seeds being less ABA-sensitive. Consistently, the expression levels of several ABI5 targets were modulated by VQ18 and VQ26. The increased ABA signaling of plants in which VQ18 and VQ26 were simultaneously suppressed required ABI5. Additionally, VQ18 and VQ26 acted as negative interactors o...Continue Reading

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Citations

Jun 5, 2020·Plants·Gerardo Carrera-CastañoLuis Oñate-Sánchez
Dec 15, 2020·Plant Physiology and Biochemistry : PPB·Guibo YuanHaidong Ding
Feb 20, 2021·Frontiers in Plant Science·José LeónMari-Cruz Castillo
May 12, 2021·Plant Cell Reports·Ya-Jing LiuChun-Xiang You

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