水稻品种‘浙粳22’内稃突变体农艺性状和稻米品质特征

Agronomic traits and rice quality of a partial palea mutant induced from a japonica rice variety ‘Zhejing 22’

以‘浙粳22’内稃突变体为材料,采用与野生型品种相比较的方法,研究内稃突变体水稻的农艺性状、稻米品质等特征。结果表明:水稻内稃突变体植株的株高、穗长与野生型植株没有明显差异,而在单穗重、每穗实粒数、千粒重、二次枝梗上则差异明显,约为野生型植株的一半左右。与对照‘浙粳22’相比,籽粒粒长相近,粒宽明显减小,‘浙粳22’长宽比只有内稃突变体的2/3。籽粒垩白率和垩白度较好,糙米率、精米率和整精米率与对照相近。RVA谱特征值(最高粘度、热浆粘度、最终粘度、消碱值和回复值)降低,直链淀粉含量增加。

Agronomic traits and rice quality of a partial palea mutant induced by irradiation from a japonica rice variety ＇Zhejing 22＇ were studied.The results showed there was no difference in plant height and ear length in comparison to its wild type,but there were significant decreases in per panicle,filled grain number per panicle,1000-grain weight and second panicle branch,which were about half of the wild type.There was a clear decrease in grain width for mutants and little difference in grain length,and the length-width ratio of ＇Zhejing 22＇ was 2/3 of the mutant.Chalk percentage and chalkiness degree of the mutant were good,while brown rice rate,milled rice rate and head rice rate was little different from the wild type.The mutant also showed lower RVA profile characters of PKV（peak viscosity）,HPV（hot paste viscosity）,CPV（cool paste viscosity）,SB（setback）,and CS（consistency）than ＇Zhejing 22＇,meanwhile,the amylose content of the mutant increased.