Nitric Oxide Represses the Arabidopsis Floral Transition

Author:

He Yikun12345,Tang Ru-Hang12345,Hao Yi12345,Stevens Robert D.12345,Cook Charles W.12345,Ahn Sun M.12345,Jing Liufang12345,Yang Zhongguang12345,Chen Longen12345,Guo Fangqing12345,Fiorani Fabio12345,Jackson Robert B.12345,Crawford Nigel M.12345,Pei Zhen-Ming12345

Affiliation:

1. Department of Biology, Duke University, Durham, NC 27708, USA.

2. Department of Biology, Capital Normal University, Beijing 100037, China.

3. Mass Spectrometry Laboratory, Duke University Medical Center, Research Triangle Park, NC 27709, USA.

4. Orthopaedic Research Laboratory, Duke University Medical Center, Durham, NC 27710, USA.

5. Division of Biological Sciences, University of California, San Diego, La Jolla, CA 92093, USA.

Abstract

The correct timing of flowering is essential for plants to maximize reproductive success and is controlled by environmental and endogenous signals. We report that nitric oxide (NO) repressed the floral transition in Arabidopsis thaliana . Plants treated with NO, as well as a mutant overproducing NO ( nox1 ), flowered late, whereas a mutant producing less NO ( nos1 ) flowered early. NO suppressed CONSTANS and GIGANTEA gene expression and enhanced FLOWERING LOCUS C expression, which indicated that NO regulates the photoperiod and autonomous pathways. Because NO is induced by environmental stimuli and constitutively produced, it may integrate both external and internal cues into the floral decision.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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