Genetic mapping of commercially significant starch characteristics in wheat crosses

文献类型： 外文期刊

第一作者： Batey, IL

作者： Batey, IL;Hayden, MJ;Cai, S;Sharp, PJ;Cornish, GB;Morell, MK;Appels, R

作者机构：

关键词： viscosity;gelatinisation;granule size;genetics;quantitative traits

期刊名称：AUSTRALIAN JOURNAL OF AGRICULTURAL RESEARCH （ 影响因子：1.328； 五年影响因子：1.781 ）

ISSN： 0004-9409

年卷期： 2001 年 52 卷 11-12 期

页码：

收录情况： SCI

摘要： Starch properties were measured on the doubled haploid progeny of 2 crosses, one between Cranbrook and Halberd and the other between CD87 and Katepwa. Properties studied included starch peak and final viscosity measured by Rapid Visco Analyser, starch granule size distribution measured by laser light scattering, starch gelatinisation temperature by differential scanning calorimetry, and flour swelling volume. In the Cranbrook x Halberd cross (samples from 2 environments), a highly significant quantitative trait locus (QTL) was located on chromosome 4A for both starch peak viscosity and starch/flour swelling volume, centred around the Wx-B1 locus. In previous studies, this locus has been found to be linked to Japanese noodle quality. The increases in starch peak viscosity and flour swelling volume are derived from the Halberd parent, consistent with the fact that Halberd is null for the Wx-B1 locus on chromosome 4A and is missing the respective granule-bound starch synthase protein, whereas Cranbrook is a wheat line carrying the normal 3 Wx loci. The final starch viscosity also showed an association with the Wx-B1 locus. In the CD87 x Katepwa cross, the progeny showed an association between peak viscosity and a marker on chromosome 7A. This appeared to be near the Wx-A1 locus. In some experiments, flour viscosity showed a highly significant QTL on chromosome 7B, apparently at the same locus as the late maturity amylase derived from the Cranbrook parent. Starch gelatinisation onset temperature indicated a significant QTL on chromosomes 2B and 7A (LOD=2.58 and 3.66, respectively, in interval analyses). Starch gelatinisation peak temperatures indicated a QTL on chromosome 7A, which, although not in the significant (P=0.05) class based on regression analyses, indicated a LOD score of 3.06 in interval analyses. Heat of gelatinisation (DeltaH) indicated a suggestive QTL (LRS=14.5 with a threshold of 14.7 for P<0.05, LOD=2.65 for interval analysis), on chromosome 4A, at the Wx-B1 locus with an increased effect coming from the Halberd parent. The A:B granule ratio analysis indicated a significant QTL on chromosome 4B, but this was not observed in all environments and may be due to the fact that the QTL corresponded to the position of a major QTL controlling plant growth.

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