不同品质类型春小麦HMW-GS形成时间和积累强度及与品质的关系

供试材料籽粒形成过程中 ,麦谷蛋白低分子量亚基部分首先出现。随籽粒发育 ,麦谷蛋白亚基类型逐渐增多。HMW- GS各个亚基在开花后 10天内没有形成 ,开花 15天左右 ,出现 Glu- 1位点上编码的高分子量 X型亚基。 2 5天时 ,所具有的 HMW- GS全部形成。随灌浆成熟 ,HMW- GS各亚基积累呈递增趋势 ,积累高峰出现在开花 2 0天至成熟。 5 10亚基与具有该亚基供试品种的优良品质之间存在密切关系 ,但具有 2 12亚基的东农 774 2的亚基形成早 ,2与 12亚基的高积累量及 1和 7 8亚基的高积累使其同样具有优质特性。Glu- 1品质评分与沉淀值之间呈显著正相关 ,能够反映小麦品质 ,但并不绝对。小麦高分子量麦谷蛋白亚基总积累与沉淀值呈显著正相关。各高分子量亚基与沉淀值之间的相关未达显著水平 ,但亚基 2与 12的积累量与沉淀值的相关性强 ,尤其是 12亚基的积累。

The Relationship between Formation Time and Accumulation Intensity of HMW-GS and It's Quality of Spring Wheat with Different Quality

During grain formation, a part of low molecular weight glutenin subunits (LMW GS) appeared firstly and then more types follow gradually along with the grain development. None of any high molecular weight subunits (HMW GS) could be found within ten days after anthesis. The first HMW GS that appeared around 15 th day after anthesis was the X type subunit coded on Glu 1 loci; 25 days post anthesis all HMW GS appeared. Individual HMW GS accumulation increased gradually and the accumulative peak during the period from 20 days after anthesis to mature. Closed relationships between good quality and subunit 5 10 was established and in the study. However, the positive correlation between good quality and subunit 2 12 was also found in the study when the subunit 1, 7 8 and 2 12 appeared early and accumulated strongly. The relationship between Glu 1 grading in quality and sendimentation value is positive significantly, and can reflect the quality in certain degree. The results indicated that the correlation between total HMW GS accumulated rate and sendimentation is positive significantly. Positive relationship between individual HMW GS and sendimentation value was found between individual HMW GS and sendimentation value, but not marked statistically except subunits 2 and 12, especially the accumulative rate in subunit 12.