YUCCAauxin biosynthetic genes are required for Arabidopsis shade avoidance

Author:

Müller-Moulé Patricia1,Nozue Kazunari1,Pytlak Melissa L.12,Palmer Christine M.13,Covington Michael F.14,Wallace Andreah D.15,Harmer Stacey L.1,Maloof Julin N.1

Affiliation:

1. Department of Plant Biology, University of California, Davis, CA, United States

2. PASCO Scientific, Roseville, CA, United State of America

3. Natural Sciences Department, Castleton University, Castleton, VT, United States

4. Amaryllis Nucleics, Berkeley, CA, United States

5. Clontech Laboratories, Mountain View, CA, United States

Abstract

Plants respond to neighbor shade by increasing stem and petiole elongation. Shade, sensed by phytochrome photoreceptors, causes stabilization ofPHYTOCHROME INTERACTING FACTORproteins and subsequent induction ofYUCCAauxin biosynthetic genes. To investigate the role ofYUCCAgenes in phytochrome-mediated elongation, we examined auxin signaling kinetics after an end-of-day far-red (EOD-FR) light treatment, and found that an auxin responsive reporter is rapidly induced within 2 hours of far-red exposure.YUCCA2, 5, 8,and9are all induced with similar kinetics suggesting that theycould act redundantly to control shade-mediated elongation. To test this hypothesis we constructed ayucca2, 5, 8, 9quadruple mutant and found that the hypocotyl and petiole EOD-FR and shade avoidance responses are completely disrupted. This work shows thatYUCCAauxin biosynthetic genes are essential for detectable shade avoidance and thatYUCCAgenes are important for petiole shade avoidance.

Funder

National Science Foundation (NSF)

UC Davis

United States Department of Agriculture NIFA project

USDA National Research Initiative

NIH

NSF

Publisher

PeerJ

Subject

General Agricultural and Biological Sciences,General Biochemistry, Genetics and Molecular Biology,General Medicine,General Neuroscience

Reference52 articles.

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