Dissecting the Genetic Basis of Grain Shape and Chalkiness Traits in Hybrid Rice Using Multiple Collaborative Populations
Dear Editor,Through the efficient use of heterosis,hybrid rice varieties generally have higher grain yield potential than inbred varieties.With the significant advantage in grain yield,over the past 30 years approximately half of China”s total rice-growing area is planted with rice hybrids.However,grain quality has now become one of the most important targets in hybrid rice breeding for meeting consumer demands.Grain shape and chalkiness are two important components of rice grain quality,in which slender grains (typically,grain length-to-width ratio ＞3) with low chalkiness are preferred by most consumers of hybrid rice.Especially,grain chalkiness not only brings down the grain appearance but also has a negative influence on milling and cooking properties.Previous studies have characterized several important genes controlling grain shape traits,e.g.,GS3 (Fan et al.,2006) affecting grain length,qSW5/GW5/GSE5 (Shomura et al.,2008;Duan et al.,2017;Liu et al.,2017) affecting grain width,GL7/GW7 (Wang et al.,2015a,2015b) shaping both grain length and grain width.By contrast,only a few quantitative trait locus (QTLs) responsible for grain chalkiness have been finely mapped and functionally characterized.Chalk5,which encodes a vacuolar H+-translocating pyrophosphatase,is the first cloned and functionally characterized gene that controls rice grain chalkiness (Li et al.,2014).However,the genetic architecture of the two traits,grain shape and grain chalkiness,in hybrid rice remains unclear.
Hybrid Rice、hybrid rice breeding、grain shape、grain quality、quantitative trait locus、grain yield、rice grain、yield potential
10
S51;S5
This work was funded by the National Natural Science Foundation of China91635302 and 91535202;the Ministry of Science and Technology of China2013CBA01404,2016YFD0100902 and 2016YFD0101801;the Chinese Academy of SciencesXDA08020101;Central Public-interest Scientific Institution Basal Research FundY2017JC08
2018-01-03（万方平台首次上网日期，不代表论文的发表时间）
共4页
1353-1356
