期刊
MOLECULAR PLANT
卷 13, 期 12, 页码 1784-1801出版社
CELL PRESS
DOI: 10.1016/j.molp.2020.10.001
关键词
rice (Oryza sativa L.); tillering; zeta-carotene isomerase; carotenoid; strigolactones; abscisic acid
资金
- Chinese Ministry of Science and Technology [2016YFD0100901]
- Ministry of Agriculture of China [2016ZX08011001]
- CAS President's International Fellowship Initiative [2018VBA0025]
- Youth Innovation Promotion Association CAS [2019099]
- CAS [XDB27010100]
Rice tillering is an important agronomic trait affecting grain yield. Here, we identified a high-tillering mutant tillering20 (t20), which could be restored to the wild type by treatment with the strigolactone (SL) analog racGR24. T20 encodes a chloroplast zeta-carotene isomerase (Z-ISO), which is involved in the biosynthesis of carotenoids and their metabolites, SL and abscisic acid (ABA). The t20 mutant has reduced SL and ABA, raising the question of how SL and ABA biosynthesis is coordinated, and whether they have overlapping functions in tillering. We discovered that rac-GR24 stimulated T20 expression and enhanced all-trans-beta-carotene biosynthesis. Importantly, rac-GR24 also stimulated expression of Oryza sativa 9-CIS-EPDXY-CAROTENOID DIOXYGENASE 1 (OsNCED1) through induction of Oryza sativa HOMEOBOX12 (OsHOX12), promoting ABA biosynthesis in shoot base. On the other hand, ABA treatment significantly repressed SL biosynthesis and the ABA biosynthetic mutants displayed elevated SL biosynthesis. ABA treatment reduced the number of basal tillers in both t20 and wild-type plants. Furthermore, while ABA-deficient mutants aba1 and aba2 had the same number of basal tillers as wild type, they had more unproductive upper tillers at maturity. This work demonstrates complex interactions in the biosynthesis of carotenoid, SLs and ABA, and reveals a role for ABA in the regulation of rice tillering.
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