The Han Bin research group of the Institute of Plant Physiology and Ecology, Chinese Academy of Sciences/National Research Center for Gene Research, discovered a new rice shriveling regulatory gene. The related results were recently published online in the international journal Plant Cell. The same issue also distributed editorial commentary. Articles, highly rated.

According to reports, the seeds of wild rice fall off automatically when they ripen, which is conducive to the spread and survival of the seeds. However, the “easy-falling graininess” will bring negative yields and other negative effects on cultivated rice varieties that target the harvest of mature rice. influences. Our ancestors began the process of domesticating rice early on from the point of view of the reduction in the number of falling grains. In fact, the seeds of modern cultivated rice differ significantly in their grain size, suggesting that shattering is a complex trait controlled by multiple genes. Therefore, it is of great agricultural significance to fully understand the regulation mechanism of rice falling grains and reduce the yield loss caused by falling grains.

Han Yan and Zhou Yan, Lü Danfeng, and other graduate students and other researchers have introduced the fourth gene of wild rice W1943 into the cultivated rice variety Guangluai 4 and constructed a shatter-resistant gene known as SH4 and qSH1. Shows a material SL4 that is very easy to shatter. Through γ-ray mutagenesis of SL4, they screened two mutants shhat1 and shat2 that were not completely shattered. Neither of these two mutants forms an aliquot, so the seeds need a lot of tension after they mature to separate the seeds from the branchlets.

Based on map-based cloning and genetic transformation, the SHAT1 gene was identified as an AP2 transcription factor with high homology to the APETALA2 gene in Arabidopsis thaliana and was highly expressed in the stratified layer. Shat2 was identified as a new allelic mutation in the SH4 gene. Unlike the previously reported single amino acid substitution mutation type of sh4 in rice, shat2 is a frameshift mutation and is therefore named sh4-2.

The researchers further elaborated the genetic relationship between the three genes SHAT1, SH4, and qSH1 through elaborate in situ hybridization analysis: SH4 promotes the expression of SHAT1 in stratified layers. In turn, SHA1 also plays a role in maintaining SH4 in stratified layers. The role of expression, both in the continuous expression of the separation from the layer is necessary for the correct formation of the layer. qSH1 acts downstream of SH4 and SHAT1 and promotes the formation of stratification by maintaining the constant expression of SHAT1 and SH4 in the stratified layer.

The study used a clever search for shattering suppressor mutants to discover new rice shriveling regulatory genes, and at the same time it was linked to known shrsp-regulated genes to open new horizons for rice shredding.

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