期刊
NEW PHYTOLOGIST
卷 236, 期 4, 页码 1512-1528出版社
WILEY
DOI: 10.1111/nph.18445
关键词
compound leaf; indeterminacy of primordia; Medicago truncatula; MtNOOTs; SGL1; stipule
资金
- National Natural Science Foundation of China [31871459, 31900172]
- National Natural Science Foundation of Shandong Province [ZR2019MC013, ZR2020KC018]
- project for Scientific Research Innovation Team of Young Scholar in Colleges and Universities of Shandong Province [2019KJE008]
- project for Innovation and Entrepreneurship Leader of Qingdao [19-3-2-3-zhc]
- National Science Foundation, USA [DBI-0703285, IOS-1127155]
Stipule morphology is an important feature for plant identification, but its molecular regulation is not well understood. This study identifies a gene involved in stipule identity and investigates its interactions with other genes. The findings propose a genetic regulatory model for stipule development, explaining the two phases of stipule development.
Stipule morphology is a classical botanical key character used in plant identification. Stipules are considerably diverse in size, function and architecture, such as leaf-like stipules, spines or tendrils. However, the molecular mechanism that regulates stipule identity remains largely unknown. We isolated mutants with abnormal stipules. The mutated gene encodes the NODULE ROOT1 (MtNOOT1), which is the ortholog of BLADE-ON-PETIOLE (BOP) in Medicago truncatula. We also obtained mutants of MtNOOT2, the homolog of MtNOOT1, but they do not show obvious defects in stipules. The mtnoot1 mtnoot2 double mutant shows a higher proportion of transformation from stipules to leaflet-like stipules than the single mutants, suggesting that they redundantly determine stipule identity. Further investigations show that MtNOOTs control stipule initiation together with SINGLE LEAFLET1 (SGL1), which functions in development of lateral leaflets. Increasing SGL1 activity in mtnoot1 mtnoot2 is sufficient for the transformation of stipules to leaves. Moreover, MtNOOTs inhibit SGL1 expression during stipule development, which is probably conserved in legume species. Our study proposes a genetic regulatory model for stipule development, specifically with regard to the MtNOOTs-SGL1 module, which functions in two phases of stipule development, first in the control of stipule initiation and second in stipule patterning.
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