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J Plant Physiol. 2019 Jun;237:72-79. doi: 10.1016/j.jplph.2019.04.003. Epub 2019 Apr 18.

Strigolactones regulate shoot elongation by mediating gibberellin metabolism and signaling in rice (Oryza sativa L.).

Author information

1
MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: zouxiao@webmail.hzau.edu.cn.
2
MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: wqi@webmail.hzau.edu.cn.
3
MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: peisaichen@163.com.
4
MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science and Technology, Huazhong Agricultural University, Wuhan 430070, China; National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: yinchangxi@mail.hzau.edu.cn.
5
National Key Laboratory of Crop Genetic Improvement and National Centre of Plant Gene Research, Huazhong Agricultural University, Wuhan 430070, China. Electronic address: yongjunlin@mail.hzau.edu.cn.

Abstract

Strigolactones (SLs) are plant hormones that regulate diverse physiological processes including shoot elongation. However, little is known about the regulatory mechanism of SLs in rice shoot elongation. Our results demonstrate that defects in SL biosynthesis or signaling led to dwarfism, and the dwarf statures of SL-deficient mutant (d17) and SL-insensitive mutant (d14) were restored to wild-type (WT) by gibberellin (GA) treatment, indicating that their dwarfism was associated with decreased GA content or weakened GA sensitivity. Our results indicate that the bioactive GA1 contents in d17 and d14 were lower than those in WT, due to the downregulated transcription of GA biosynthesis genes and upregulated transcription of GA inactivation genes. Moreover, d17 and d14 exhibited weakened GA-responsive sensitivity compared with WT. Although the transcription levels of cell division- and cell elongation-related genes were upregulated by GA3 treatment, the increase in transcription of d17 and d14 was lower than that in WT. These results suggest that SL is required for rice shoot elongation by mediating GA metabolism and signaling. Therefore, a deficiency in SL biosynthesis or signaling leads to decreased GA content and weakened GA response, which in turn reduces shoot length by downregulating transcription levels of cell division- and cell elongation-related genes.

KEYWORDS:

Gibberellin metabolism; Gibberellin signaling; Leaf sheath; Rice; Shoot elongation; Strigolactone

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