LIFE SCIENCE

Studies have revealed a new mechanism for regulating rice panicle extraction


The molecular modules composed of OsTPR075-OsFTIP1/9 mediate the transport of anthricultone, which in turn regulates the panicle extraction stage of rice. Courtesy of the Chinese Academy of Agricultural Sciences

Recently, the research of academician Hu Peisong of China Rice Research Institute revealed a new mechanism for osTPR075-OsFTIP1/9-RFT1/Hd3a molecular module to regulate the panicle extraction period of rice, which has important guiding significance for the genetic improvement of rice. The findings were published online in The Plant Cell.

The ear extraction stage (flowering stage) of rice is an important symbol of rice’s transition from vegetative growth to reproductive growth, an important agronomic trait that determines rice reproduction, and one of the main target traits selected by artificial selection. The regulation of the rice ear extraction stage is an extremely complex life process, determined by intrinsic genetic factors such as genes and external environmental factors such as light and temperature.

Since the early and late panicle extraction stages will affect the accumulation of photosynthetic products of rice, the enrichment process of grains at the filling stage of rice, and ultimately affect the yield and quality of rice. The rice panicle extraction period also determines the adaptability and yield of rice varieties in different regions. Therefore, the study of the molecular regulation mechanism of rice at the panicle extraction stage has important theoretical and practical significance for molecular breeding and agricultural production.

The study found that anthorphaly, Anthonym and RFT1 play an extremely important role in the process of rice panicle extraction. Hd3a and RFT1 are the main anthocyanins for short and long days, respectively, mainly transported by leaf synthesis to the apical meristem to promote rice panicle extraction, and if Hd3a and RFT1 are missing, rice cannot be pumped.

The anthocyanin transporter OsFTIP1 of rice was isolated and identified in the early stage, and it was found that OsFTIP1 affected the transport of RFT1 and affected the panicle extraction period of rice under long sunshine. The mutant Osftip1 exhibits a pronounced late spike-twitching phenotype in long-sunlight conditions, while no apparent phenotype in short daylight, suggesting that other proteins may be responsible for the transport of Hd3a in short daylight.

The study isolated and identified the Hd3a interaction protein OsFTIP9 through the protein interaction screening of Hd3a, and through gene editing technology, it was found that its mutant Osftip9 showed obvious phenotype of panicle extraction and late panicle under short daylight conditions, and the immune footprint imprinting and immunocolloidal gold tracing technology revealed that OsFTIP9 affected the transport of Hd3a from leaves to companion cells, which in turn affected the panicle extraction period of rice.

More interestingly, the researchers also isolated and identified a protein of the TPR family, OsTPR075, which has an unknown function, and found that it can interact with OsFTIP1 and OsFTIP9 at the same time, and affect the intensity of interaction between OsFTIP1-RFT1 and OsFTIP9-Hd3a, and then regulate the transport of anthocyanins.

The study revealed the mechanism of action of the OsTPR075-OsFTIP1/9-RFT1/Hd3a molecular module to regulate the flowering transition of rice under long and short sunshine conditions. The research has been funded by the National Natural Science Foundation of China and the Natural Science Foundation of Zhejiang Province. (Source: China Science Daily Li Chen)

Related paper information:https://doi.org/10.1093/plcell/koac190



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