Identification of QTLs involved in physiological and agronomic indicators of drought tolerance in rye using a multiple selection index.

Book Title: NA
Year Published: 2003
Month Published: NA
Author: Farshadfar, E. ; Mohammadi, R. ; Aghaee, M. ; Sutka, J.
Book Group Author: NA

Water deficiency is a major constraint in wheat production and the most important contributor to yield reduction in the semiarid regions of the world. Species related to wheat are valuable genetic sources for different traits including resistance/tolerance to biotic and abiotic stresses. To locate the genes controlling the physiological and agronomic criteria of drought tolerance, disomic addition lines of Secale cereale cv. Imperial (donor) into the genetic background of Triticum aestivum cv. Chinese Spring (recipient) were tested under field (in Hungary), greenhouse and laboratory conditions. Disomic addition lines exhibited significant differences for relative water content (RWC), relative water loss (RWL), water use efficiency (WUE) and stomatal resistance (SR), indicating the presence of genetic variation and the possibility of selection for improving drought tolerance. Three physiological variables, RWL, WUE and SR, with high correlation with the stress tolerance index (STI) and germination stress index (GSI), contributed 69.7% to the variability of yield under stress (Ys) in the regression equation. Based on the physiological multiple selection index (MSI) most of the quantitative trait loci (QTLs) controlling physiological indices of drought tolerance were located on chromosomes 3R, 5R and 7R. The contribution of addition line 7R to the MSI was 47%. The evaluation of disomic addition lines for STI and GSI revealed that most of the QTLs involved in these quantitative criteria of drought tolerance are located on 3R and 7R. Cluster analysis and three dimensional plots of Ys, yield potential and MSI indicated that 3R and 7R are the most important chromosomes carrying useful genes for improving drought tolerance.

Pages: 419 - 428
Volume: 51
Number: 4
Journal: Acta Agronomica Hungarica
Journal ISO: NA
Organization: NA
Publisher: NA
ISSN: 0238-0161

addition lines, chromosomes, cluster analysis, crop yield,drought resistance, genes, genetic variation, plant water relations,quantitative trait loci, rye, seed germination, stomatal resistance,water content, water use efficiency, Hungary, Secale cereale, Secale,Poaceae, Cyperales, monocotyledons, angiosperms, Spermatophyta, plants,eukaryotes, Central Europe, Europe, Developed Countries, OECD Countries,drought tolerance, genetic variability, genotypic variability, genotypicvariation, Field Crops (FF005) (New March 2000), Plant Breeding andGenetics (FF020), Plant Water Relations (FF062), Plant Production(FF100), Environmental Tolerance of Plants (FF900)

Source: EBSCO
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