ارزيابي شاخصهاي فيزيولوژيكي مقاومت به خشكي در آگروپيرون با استفاده از شاخص انتخاب چندگانه

An Evaluation of Physiological Indices of Drought Tolerance in Agropyron Using Multiple Selection Index

Drought stress as the most important abiotic stress plays an important role in the yield reduction of crop plants worldwide. Considering physiological indicators as well as wild species to improve drought resistance is of paramount importance. In order to evaluate chromozomal location of physiological indicators of drought tolerance in the wild species of Agropyron a complete series of disomic addittion lines of Agropyron, donor parent (Agropyron elongatum) and recipient (Triticam aestivum L.cv. Chinese Spring) were investigated under field, green house and laboratory conditions. Disomic addition lines indicated significant differences for relative water content (RWC), relative water loss (RWL), water use efficiency (WUE), chlorophyll flourescence (CHF) and stomata] resistance (SR), indicating genetic variation and possibility of selection for improving drought tolerance in disomic addition lines. Physiological indices of chlorophyll fluorescence, relative water loss and water use efficiency played an important role in the regression equation of yield under stress. Based on the physiological multiple selection index (MSI) most of the loci (QTLs) controlling physiological characters of drought tolerance were located on chromosomes 3E, 5E and 7E. Assessment of disomic addition lines based on stress tolerance index (STI) and germination stress index (GSI) indicated that most of the QTLs controlling drought tolerance are located on chromosomes 3E, 5E and 7E.