Markers associated with a QTL for grain yield in wheat under drought |
| |
Authors: | F M Kirigwi M Van Ginkel G Brown-Guedira B S Gill G M Paulsen A K Fritz |
| |
Institution: | (1) Department of Agronomy, Kansas State University, Manhattan, KS 66502, USA;(2) Department of Primary industries (DPI), DX Number: 216515, Private Bag 260, Horsham, VIC, 3401, Australia;(3) USDA-ARS Eastern Regional Small Grains Genotyping Lab, 840 Main Campus Dr, Raleigh, NC 27606, USA;(4) Department of Plant Pathology, Kansas State University, Manhattan, KS 66502, USA |
| |
Abstract: | Drought is a major abiotic stress that adversely affects wheat production in many regions of the world. The objective of this
study was to identify quantitative trait loci (QTL) controlling grain yield and yield components under reduced moisture. A
cross between common wheat cultivars ‘Dharwar Dry’ (drought tolerant) and ‘Sitta’ was the source of one hundred twenty-seven
recombinant inbred lines evaluated for two-seasons in a field under differing soil moisture regimes in Ciudad Obregon, Sonora,
Mexico. An SSR/EST-STS marker map was constructed and a grain yield QTL on the proximal region of chromosome 4AL was found
to have a significant impact on performance under reduced moisture. This region was associated with QTL for grain yield, grain
fill rate, spike density, grains m−2, biomass production, biomass production rate, and drought susceptibility index (DSI). Molecular markers associated with these
traits explained 20, 33, 15, 23, 30, 26, and 41% of phenotypic variation, respectively on chromosome 4A. Microsatellite locus
Xwmc89 was associated with all significant QTL covering a 7.7 centiMorgans (cM) region and generally explained the greatest proportion
of phenotypic variation. The alleles associated with enhanced performance under drought stress were contributed by Dharwar
Dry. Microsatellite marker wmc89 may be useful for marker assisted selection to enhance drought tolerance. |
| |
Keywords: | Wheat Drought Markers QTL |
本文献已被 SpringerLink 等数据库收录! |
|