首页|期刊导航|中国农业科学（英文版）|The Effects of Dwarfing Genes (Rht-B1b,Rht-D1b,and Rht8) with Different Sensitivity to GA3 on the Coleoptile Length and Plant Height of Wheat
中国农业科学（英文版）2009，Vol.8Issue(9)：1028-1038,11.DOI:10.1016/S1671-2927(08)60310-7
The Effects of Dwarfing Genes (Rht-B1b,Rht-D1b,and Rht8) with Different Sensitivity to GA3 on the Coleoptile Length and Plant Height of Wheat
The Effects of Dwarfing Genes (Rht-B1b,Rht-D1b,and Rht8) with Different Sensitivity to GA3 on the Coleoptile Length and Plant Height of Wheat
摘要
Abstract
Understanding the effects of wheat dwarfing genes on the coleoptile length and plant height is crucial for the proper utilization of dwarfing genes in the improvement of wheat yield.Molecular marker analysis combined with pedigree information were used to classify wheat cultivars widely planted in major wheat growing regions in China into different categories based on the dwarfing genes they carried.The effects of the dwarfing genes with different sensitivity to gibberellins (GA3) on the coleoptile length and plant height were analyzed.Screening of 129 cultivars by molecular marker analysis revealed that 58 genotypes of wheat contained the dwarfing gene Rht-B1b,24 genotypes of wheat contained Rht-D1b gene and 73 genotypes of wheat possessed Rht8 gene.In addition,among these 129 cultivars,35 genotypes of wheat cultivars contained both Rht-B1b and Rht8 genes and 16 genotypes of wheat cultivars contained both Rht-D1b and Rht8 genes.Wheat cultivars with the dwarfing genes Rht-B1b or Rht-D1b were insensitive to GA3,while the cultivars with the dwarfing gene Rht8 were sensitive to GA3.Most of the wheat genotypes containing combination of Rht8 gene with either Rht-B1b or Rht-Dlb gene were insensitive to GA3.The plant height was reduced by 24.6,30.4,28.2,and 32.2%,respectively,for the wheat cultivars containing Rht-B1b,Rht-D1b,Rht-B1b+Rht8,and Rht-D1b+Rht8 genes.The plant height was reduced by 14.3% for the wheat cultivar containing GA3-sensitive gene Rht8.The coleoptile length was shortened by 25.4,31.3,28.4 and 31.3%,respectively,in the wheat cultivars containing Rht-B1b,Rht-D1b,Rht-B1b+Rht8 and Rht-D1b+Rht8 genes,while the coleoptile length was shortened only by 6.2% for the wheat cultivar containing Rht8 gene.We conclude that GA3-insensitive dwarfing genes (Rht-B1b and Rht-D1b)are not suitable for the wheat improvement in dryland because these two genes have eflfect on reducing both plant height and coleoptile length.In contrast,GA3-sensitive dwarfing gene (Rht8) is a relatively ideal candidate for the wheat improvement since it significantly reduces the plant height of wheat,but has less effect on the coleoptile length.关键词
bread wheat/dwarfing genes/Rht-B1b/Rht-D1b/Rht8/coleoptile length/plant heightKey words
bread wheat/dwarfing genes/Rht-B1b/Rht-D1b/Rht8/coleoptile length/plant height引用本文复制引用
TANG Na,JIANG Ying,HE Bei-ru,HU Yin-gang..The Effects of Dwarfing Genes (Rht-B1b,Rht-D1b,and Rht8) with Different Sensitivity to GA3 on the Coleoptile Length and Plant Height of Wheat[J].中国农业科学（英文版）,2009,8(9):1028-1038,11.基金项目
This research was supported by the National High-Tech R&D Program of China (863 Program,2006AA100201,2006AA100223),the National Basic Research Program of China (973 Program,2006CB708208),the 111 Program of Introducing Talents of Discipline to Universities of China (111-2-16),and the ACIAR Program of Australia (CIM/2005/111). （863 Program,2006AA100201,2006AA100223）
