Institute of Phytoecology found rice transcription factor MADS29
Recently, "Plant Cell" published the latest research results of the Xue Hongwei Research Group of the State Key Laboratory of Molecular Genetics of the Institute of Phytobiology, Shanghai Institute of Biological Sciences. The transcription factor MADS29 regulates maternal tissue degradation during seed development in rice (Lin -Lin Yin and Hong-Wei Xue, Plant Cell, 2012. 10.1105/tpc.111.094854).
Rice seeds are an important food source for humans. Their development involves a complex regulatory network, in which transcription factors play a key role. MADS transcription factor family members are important regulators of flower organ development. Previous studies have shown that almost all rice MADS genes are expressed in seeds, but the results of MADS family members involved in the regulation of rice seed development are still relatively small.
In this study, based on previous research on expression profiling, the research team analyzed a transcription factor MADS29 that was preferentially expressed during rice reproductive development. Detailed analysis showed that MADS29 was expressed in anthers, ovules and seeds, and the expression of maternal tissue was highest after fertilization. Antisense transgenic plants of MADS29 showed phenotypes such as seed shrinkage, abnormal morphological changes of starch grains, and reduced filling rate. Through anatomical sections, terminal transferase labeling experiments, and genome-wide expression profiling microarray analysis, it was demonstrated that MADS29 promotes the degradation of nucellar cells and nucellus protrusions through the regulation of programmed death (PCD). Further in vitro gel retardation experiments showed that MADS29 can regulate expression of the death-associated gene by directly binding to the promoter region, thereby affecting the endosperm development. These results identified a regulatory factor involved in the degradation of nucellar cells and nucellus protrusions, confirming that degradation of these two tissues is a prerequisite for normal rice grain filling, and suggesting that auxin (IAA) signaling is degraded in maternal tissue and endosperm development The role of the medium helps to further understand the molecular mechanisms of rice seed development, especially the regulation of endosperm development.
This work received financial support from the Ministry of Science and Technology, the Ministry of Agriculture, and the Chinese Academy of Sciences.
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