Phenotype/genotype associations for yield and salt tolerance in a barley mapping population segregating for two dwarfing genes

作者：Roger Pearson Ellis, Brian Peter Forster, DENNIS C. GORDON, Linda L. Handley, Richard Keith, Patricia Lawrence, Rhonda Christiane Meyer, Wayne Powell, David Conal Robinson, Charlie M. Scrimgeour, George R. Young, William T. B. Thomas · 发表于：Journal of Experimental Botany · 年份：2002 · DOI：10.1093/jexbot/53.371.1163 · 被引用次数：130 · 研究领域：Wheat and Barley Genetics and Pathology、Plant Stress Responses and Tolerance、Genetics and Plant Breeding

Barley traits related to salt tolerance are mapped in a population segregating for a dwarfing gene associated with salt tolerance. Twelve quantitative trait loci (QTLs) were detected for seven seedling traits in doubled haploids from the spring barley cross Derkado x B83-12/21/5 when given saline treatment in hydroponics. The location of QTLs for seedling growth stage (leaf appearance rate), stem weight prior to elongation, and tiller number are reported for the first time. In addition, four QTLs were found for the mature plant traits grain nitrogen and plot yield. In total, seven QTLs are co-located with the dwarfing genes sdw1, on chromosome 3H, and ari-e.GP, on chromosome 5H, including seedling leaf response (SGa) to gibberellic acid (GA(3)). QTLs controlling the growth of leaves (GS2) on chromosomes 2H and 3H and emergence of tillers (TN2) and grain yield were independent of the dwarfing genes. Field trials were grown in eastern Scotland and England to estimate yield and grain composition. A genetic map was used to compare the positions of QTLs for seedling traits with the location of QTLs for the mature plant traits. The results are discussed in relation to the study of barley physiology and the location of genes for dwarf habit and responses to GA.