Abscisic acid biosynthesis is necessary for full auxin effects on hypocotyl elongation

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Authors

EMENECKER Ryan J CAMMARATA Joseph YUAN Irene HOWARD Caroline EBRAHIMI NAGHANI Shekoufeh ROBERT BOISIVON Helene NAMBARA Eiji STRADER Lucia C

Year of publication 2023
Type Article in Periodical
Magazine / Source Development
MU Faculty or unit

Central European Institute of Technology

Citation
Web https://journals.biologists.com/dev/article-abstract/doi/10.1242/dev.202106/333522/Abscisic-acid-biosynthesis-is-necessary-for-full
Doi http://dx.doi.org/10.1242/dev.202106
Keywords Auxin; abscisic acid; phytohormone; plant development; phytohormone interactions
Description In concert with other phytohormones, auxin regulates plant growth and development. However, how auxin and other phytohormones coordinately regulate distinct processes is not fully understood. In this work, we uncover an auxin - abscisic acid (ABA) interaction module that is specific to coordinating activities of these hormones in the hypocotyl. From our forward genetics screen, we determine that ABA biosynthesis is required for the full effects of auxin on hypocotyl elongation. Our data also suggest that ABA biosynthesis is not required for the inhibitory effects of auxin treatment on root elongation. Our transcriptome analysis identified distinct auxin-responsive genes in root and shoot tissues, consistent with differential regulation of the growth in these tissues. Further, our data suggests that many gene targets repressed upon auxin treatment require an intact ABA pathway for full repression. Our results support a model in which auxin stimulates ABA biosynthesis to fully regulate hypocotyl elongation.
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