Journal
JOURNAL OF PLANT PHYSIOLOGY
Volume 237, Issue -, Pages 72-79Publisher
ELSEVIER GMBH
DOI: 10.1016/j.jplph.2019.04.003
Keywords
Gibberellin metabolism; Gibberellin signaling; Leaf sheath; Rice; Shoot elongation; Strigolactone
Categories
Funding
- National Key Research and Development Program of China [2016YFD0300102]
- Natural Science Foundation of Hubei Province of China [2016CFB436]
- China Postdoctoral Science Foundation [2015M580652, 2016T90705]
- Fundamental Research Funds for the Central Universities [2662018PY076]
Ask authors/readers for more resources
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 GA(1) 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 GA(3) 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available