caa a22 4500 445324759 CHVBK 20180317142716.0 cr unu---uuuuu 170323e20110701xx s 000 0 eng 10.1007/s10681-011-0349-6 doi (NATIONALLICENCE)springer-10.1007/s10681-011-0349-6 Genetic loci linking improved heat tolerance in wheat ( Triticum aestivum L.) to lower leaf and spike temperatures under controlled conditions [Elektronische Daten] [R. Esten Mason, Suchismita Mondal, Francis Beecher, Dirk Hays] Heat stress adversely affects wheat production in many regions of the world and is particularly detrimental during reproductive development. The objective of this study was to identify novel quantitative trait loci (QTL) associated with improved heat tolerance in wheat (Triticum aestivum L.) and to confirm previous QTL results. To accomplish this, a recombinant inbred line (RIL) population was subjected to a three-day 38°C daytime heat stress treatment during early grain-filling. At maturity, a heat susceptibility index (HSI) was calculated from the reduction of three main spike yield components; kernel number, total kernel weight, and single kernel weight. The HSI, as well as temperature depression (TD) of the main spike and main flag leaf during heat stress were used as phenotypic measures of heat tolerance. QTL analysis identified 14 QTL for HSI, with individual QTL explaining from 4.5 to 19.3% of the phenotypic variance. Seven of these QTL co-localized for both TD and HSI. At all seven loci, the allele for a cooler flag leaf or spike temperature (up to 0.81°C) was associated with greater heat tolerance, indicated by a lower HSI. In a comparison to previous QTL results in a RIL population utilizing the same source of heat tolerance, seven genome regions for heat tolerance were consistently detected across populations. The genetic effect of combining three of these QTL, located on chromosomes 1B, 5A, and 6D, demonstrate the potential benefit of selecting for multiple heat tolerance alleles simultaneously. The genome regions identified in this study serve as potential target regions for fine-mapping and development of molecular markers for more rapid development of heat tolerant germplasm. Springer Science+Business Media B.V., 2011 Wheat nationallicence Heat stress nationallicence Abiotic stress nationallicence QTL nationallicence Mapping nationallicence Climate change nationallicence Molecular markers nationallicence Mas nationallicence Esten Mason R. Department of Crop Soil and Environmental Sciences, University of Arkansas, 115 Plant Sciences Building, 72701, Fayetteville, AR, USA aut Mondal Suchismita Department of Soil and Crop Sciences, Texas A&M University, 2474 TAMU, 77843, College Station, TX, USA aut Beecher Francis Department of Soil and Crop Sciences, Texas A&M University, 2474 TAMU, 77843, College Station, TX, USA aut Hays Dirk Department of Soil and Crop Sciences, Texas A&M University, 2474 TAMU, 77843, College Station, TX, USA aut Euphytica Springer Netherlands 180/2(2011-07-01), 181-194 0014-2336 180:2<181 2011 180 10681 https://doi.org/10.1007/s10681-011-0349-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10681-011-0349-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Esten Mason R. Department of Crop Soil and Environmental Sciences, University of Arkansas, 115 Plant Sciences Building, 72701, Fayetteville, AR, USA aut NATIONALLICENCE 700 1- Mondal Suchismita Department of Soil and Crop Sciences, Texas A&M University, 2474 TAMU, 77843, College Station, TX, USA aut NATIONALLICENCE 700 1- Beecher Francis Department of Soil and Crop Sciences, Texas A&M University, 2474 TAMU, 77843, College Station, TX, USA aut NATIONALLICENCE 700 1- Hays Dirk Department of Soil and Crop Sciences, Texas A&M University, 2474 TAMU, 77843, College Station, TX, USA aut NATIONALLICENCE 773 0- Euphytica Springer Netherlands 180/2(2011-07-01), 181-194 0014-2336 180:2<181 2011 180 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer