期刊
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
卷 21, 期 11, 页码 -出版社
MDPI
DOI: 10.3390/ijms21114060
关键词
ALOG family; COCHLEATA; IN asymmetry; LSH3; SYMMETRIC PETALS 1; Pisum sativum
资金
- National Key R&D Program of China [2018YFD1000706, 2018YFD1000700]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515011216]
- Fundamental Research Funds for the Central Universities [19lgpy196]
In contrast to typical radially symmetrical flowers, zygomorphic flowers, such as those produced by pea (Pisum sativum L.), have bilateral symmetry, manifesting dorsoventral (DV) and organ internal (IN) asymmetry. However, the molecular mechanism controlling IN asymmetry remains largely unclear. Here, we used a comparative mapping approach to clone SYMMETRIC PETALS 1 (SYP1), which encodes a key regulator of floral organ internal asymmetry. Phylogenetic analysis showed that SYP1 is an ortholog of Arabidopsis thaliana LIGHT-DEPENDENT SHORT HYPOCOTYL 3 (LSH3), an ALOG (Arabidopsis LSH1 and Oryza G1) family transcription factor. Genetic analysis and physical interaction assays showed that COCHLEATA (COCH, Arabidopsis BLADE-ON-PETIOLE ortholog), a known regulator of compound leaf and nodule identity in pea, is involved in organ internal asymmetry and interacts with SYP1. COCH and SYP1 had similar expression patterns and COCH and SYP1 target to the nucleus. Furthermore, our results suggested that COCH represses the 26S proteasome-mediated degradation of SYP1 and regulates its abundance. Our study suggested that the COCH-SYP1 module plays a pivotal role in floral organ internal asymmetry development in legumes.
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