相同遗传背景下7 8与17 18亚基对小麦理化品质的影响

为准确研究不同高分子量麦谷蛋白亚基（HMW-GS）对小麦品质的贡献，消除因取材不同对结果的影响，用甘春20号（1，7＋8，5＋10）和永良4号（1，17＋18，5＋10）分别进行正、反交，使其杂种后代间具有相同的遗传背景，在杂种F3代选择只有7＋8亚基和17＋18亚基差异的单株，对两种类型籽粒的理化品质进行了分析。结果表明，对于蛋白质含量、灰分含量、沉淀值、面筋含量和降落数值，7＋8亚基和17＋18亚基的贡献无明显差别，亚基效应为7＋8=17＋18；对于颗粒度和面筋指数，7＋8亚基的贡献明显大于17＋18亚基，差异达到极显著水平，亚基效应为7＋8〉17＋18；对于出粉率，17＋18亚基的贡献明显大于7＋8亚基，亚基效应为7＋8〈17＋18，差异也达到极显著水平。

Effect of HMW-GS 7 8 and 17 18 on Wheat Physical and Chemical Quality in the Same Genetic Background

The spring wheat variety Ganchun 20 and Yongliang 4 were planted widely in wheat growing region of Hexi corridor and along yellow river region in Gansu recent years.Ganchun 20 has HMW-GS of 1,7+8,5+10,and Yongliang 4 has HMW-GS of 1,17+18,5+10.The difference between Ganchun 20 and Yongliang 4 is the HMW-GS of 7+8 and 17+18,which all located on Glu-B1.But they have different quality to making food stuff.A pair of reciprocal cross combination between Ganchun 20 and Yongliang 4 was made in order to make the hybrid has the same genetic background,and to study the effects of HMW-GS 7+8 and 17+18 on physical and chemical quality in the F_2 population.The result indicated that there was no difference between HMW-GS 7+8 and 17+18 on the quality of protein content,ash content,sedimentation value,gluten content and falling number,the subunit effect of 7+8=17+18 was equal.But there was significant difference between HMW-GS 7+8 and 17+18,on granularity and gluten index,the subunit effect of 7+8 was gneaten than that of 17+18.In additional,there was significant difference between HMW-GS 7+8 and 17+18 on milling extraction,the subunit effect of 7+8 was weaker than that of 17+18.