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QTL analysis for some quantitative traits in bread wheat

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2007年第11期8卷 807-814页

作者： PUSHPENDRA Kumar Gupta HARINDRA Singh Balyan PAWAN Laxminarayan Kulwal NEERAJ Kumar AJAY Kumar REYAZUL Rouf Mir AMITA Mohan JITENDRA Kumar Molecular Biology Laboratory Department of Genetics and Plant BreedingChaudhary Charan Singh UniversityMeerut 250 004India

Quantitative trait loci (QTL) analysis was conducted in bread wheat for 14 important traits utilizing data from four different mapping populations involving different approaches of QTL analysis. Analysis for grain protein content (GPC) sug- gested that the major part of genetic variation for this trait is due to environmental interactions. In contrast, pre-harvest sprouting tolerance (PHST) was controlled mainly by main effect QTL (M-QTL) with very little genetic variation due to environmental interactions; a major QTL for PHST was detected on chromosome arm 3AL. For grain weight, one QTL each was detected on chromosome arms 1AS, 2BS and 7AS. QTL for 4 growth related traits taken together detected by different methods ranged from 37 to 40; nine QTL that were detected by single-locus as well as two-locus analyses were all M-QTL. Similarly, single-locus and two-locus QTL analyses for seven yield and yield contributing traits in two populations respectively allowed detection of 25 and 50 QTL by composite interval mapping (CIM), 16 and 25 QTL by multiple-trait composite interval mapping (MCIM) and 38 and 37 QTL by two-locus analyses. These studies should prove useful in QTL cloning and wheat improvement through marker aided selection.

关键词： Quantitative trait loci (QTL) analysis grain quality traits grain protein content Pre-harvest sprouting tolerance(PHST) grain weight Mapping populations Bread wheat

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Comparison of grain quality Characteristics Between F_1 Hybrids and Their Parents in Indica Hybrid Rice

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Rice science 2003年第1期10卷 16-22页

作者： LIAO Fu-ming, ZHOU Kun-lu, YANG He-hua, Xu Qiu-sheng (China National Hybrid Rice Research and Developmental Center, Changsha 410125, China) China National Hybrid Rice Research and Developmental Center Changsha 410125 China

Sixteen widespread elite indica parents including seven CMS lines and nine restorer lines, and their 63 F_1 hybrids were chosen to compare the eleven traits of grain quality. Overall results showed that the frequency of negative over-dominance, dominance and partial dominance was much higher than that of positive ones and heterosis, indicating that the values of F_1 hybrids were generally lower than the means of their parents in quality characteristics. There existed apparent disparity in grain quality performance among F_1 hybrids varied with the traits. The characteristics of chalky area percentage, chalky grain percentage, gel consistency and head rice recovery had a great variation in all kinds of tested heterosis indices including the mid-parent heterosis index, over high-value parent heterosis index and over low-value parent heterosis index, which suggested that special attention should be paid to the selection of F_1 hybrids in these traits in breeding. The mean values of F_1 hybrids were significantly lower than those of their higher parents in all the traits but close to or significantly lower than those of their mid-parent values except for kernel length and amylose content; and significantly higher than those of their lower parents except for brown rice recovery, milled rice recovery and gel consistency.

关键词： hybrid rice indiea rice grain quality traits relative heterosis heterosis index

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