中国农业科学（英文版）2006，Vol.5Issue(10)：736-744,9.
QTLs for Sugar Content of Stalk in Sweet Sorghum (Sorghum bicolor L.Moench)
QTLs for Sugar Content of Stalk in Sweet Sorghum (Sorghum bicolor L.Moench)
BIAN Yun-long 1Yazaki Seiji 2Inoue Maiko 2CAI Hong-wei2
作者信息
- 1. Jiangsu Provincial Key Laboratory of Crop Genetics and Physiology/Department of Agronomy, Yangzhou University, Yangzhou 225009, P.R. China
- 2. Forage Crop Research Institute, Japan Grassland Agriculture and Forage Seed Association 388-5, Higashiakata, Nasushiobara, Tochigi 329-2742, Japan
- 折叠
摘要
Abstract
High sugar content of sorghum stalk is an important factor in the sorghum silage production. To identify the genomic regions controlling sugar content and to develop molecular markers linked to sugar content in sweet sorghum, we used an Early Folger, and a normal inbred line, N32B, for genetic linkage mapping and quantitative trait locus (QTL) analysis. We constructed a genetic linkage map spanning 983.5 cM based on a total of 327 markers comprising 31 restriction fragment length polymorphism (RFLP) markers, 254 amplified fragment length polymorphism (AFLP) markers, and 42 simple sequence repeat (SSR) markers. In the 20 linkage groups detected, 98.2% of markers aligned to the 10 linkage groups of sorghum.Variations in sugar content at different growth stages and among internodes suggested that the sugar content of middle internodes is stable and suitable for measuring at early dough stage. The broad sense heritability (hB2) of sugar content was 0.64 and 0.62 estimated from the data of F3 families and each parent in 2003 and 2004. We identified one and two QTLs accounting for 22.2 to 25.0% of phenotypic variance using simple interval mapping method in 2003 and 2004, respectively.These two QTLs showed a negative additive effect, and over-dominance effect. A QTL on LG-D was detected in both two years. Above results will be help us to understand the genetic mechanism of sugar content in sorghum and the QTL detected in this study might be useful in the improvement of sugar content by marker-assisted selection.关键词
sugar content/molecular marker/QTL/sorghumKey words
sugar content/molecular marker/QTL/sorghum分类
农业科技引用本文复制引用
BIAN Yun-long,Yazaki Seiji,Inoue Maiko,CAI Hong-wei..QTLs for Sugar Content of Stalk in Sweet Sorghum (Sorghum bicolor L.Moench)[J].中国农业科学（英文版）,2006,5(10):736-744,9.
