Rice is one of the most important grains in the world.Rice yield and quality are the two most important comprehensive characters in rice research.Grain shape directly affects the yield and quality of rice,which is an important target trait for yield and quality improvement.In the aspect of grain yield,the characters of grain length,grain width and grain thickness are positively correlated with the index of 1000-grain weight.At the same time,grain shape affects the quality traits of rice,which is closely related to appearance quality,chalkiness,head milled rice rate and cooking and eating quality.Rice grain-shape genes are quantitative traits controlled by multiple genes.Researchers have cloned a number of grain-shape major genes from different rice materials,which distribute on multiple chromosomes and regulate different grain-shape traits,the cloning of some grain shape genes provides a good basis for genetic improvement and grain shape regulation in rice.
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