杂交水稻穗上不同粒位籽粒品质性状的差异

以两系杂交稻两优培九、扬两优6号和103S/郑粳2号及三系杂交稻丰优香占和汕优63为材料,研究稻米整精米率、垩白度和胶稠度在穗上不同部位和不同粒位间的差异及其分布特点。结果表明:整精米率和胶稠度由高到低依次为穗上部、中部、下部枝梗籽粒以及一次枝梗、二次枝梗籽粒;而垩白度则相反。一次枝梗不同粒位籽粒,整精米率和垩白度由小到大依次为第1、第6及第2、3、4、5粒;二次枝梗不同粒位籽粒,整精米率和垩白度由小到大依次为第1、第5及第2、3、4粒;而胶稠度则相反。不同杂交组合粒位间整精米率最大极差变幅为9.57%~14.93%,垩白度为2.71%~9.90%,胶稠度为9.92%~23.47%。

Difference in quality characters of the grains at different positions within a hybrid rice panicle

Twoline or threeline system rice hybrids of Liangyoupeijiu,Yangliangyou 6,103S/Zhenjing 2,Fengyouxianzhan and Shanyou 63 were used as materials.All primary branches on a panicle were evenly divided into three parts of the upper,middle and basal.The grains were numbered as 1 to 6 on a primary branch and 1 to 5 on a secondary branch from the top to base.The difference and distribution characters of head rice(HR),chalkiness degree (CD) and gel consistence(GC) among the grains at different positions within a rice panicle were investigated.The results showed that grains on the branches at the upper parts of a panicle exhibited the greatest HR and GC,followed by those at the middle part,and those at the basal part the least.For the grains on a primary branch were greater than those on a secondary branch at the same part of a panicle.The results were reversed to CD.The order of HR and CD of grain on a primary branch was the grain(1<)the grain 6