Showing 2 results for Karimzadeh Sureshjani
S. Moori, Y. Emam, H. Karimzadeh Sureshjani ,
Volume 2, Issue 4 (8-2012)
Abstract
To evaluate the response of wheat genotypes to terminal drought stress and to identify drought tolerant and sensitive genotypes, 20 wheat genotypes were compared in two stress and normal conditions, in a field experiment carried out at the Experimental Farm of College of Agriculture, Shiraz University, Shiraz, Iran, as a split-plot arrangement using complete randomized blocks design with four replications, during 2008-9 growing season. Main plot was irrigation (normal irrigation and cutting off irrigation at flowering stage) and sub plot was 20 wheat genotypes. The results of ANOVA showed that there was highly significant difference among genotypes for all measured traits, indicating genetic variation among genotypes, which allowed genotype selection for drought tolerance. Comparison of traits’ means showed that the highest grain yield was obtained from Derakhshan cultivar (894.7 g/m2) in irrigation treatment and in drought conditions from M-73-6 genotype (442.1 g/m2). However, the least grain yield in both stress and non-stress conditions was obtained from Souraplata cultivar (362.4 and 149.7 g/m2, respectively). Results also showed that chlorophyll concentration of flag leaf was increased under drought conditions with the highest percentage in Yavarous cultivar (65.02%). Relative water content (RWC) for flag leaf was decreased under drought stress conditions and the highest reduction was found in Shiraz cultivar (31.06%). While there was no significant correlation between chlorophyll concentration and grain yield, RWC of flag leaf showed a significant correlation with grain yield of genotypes. Therefore, RWC could be used as a suitable index for screening drought tolerant wheat genotypes.
Y. Emam, H. Karimzadeh Sureshjani, S. Moori , K. Maghsoudi,
Volume 3, Issue 8 (6-2013)
Abstract
Drought stress is the most important factor restricting both growth and crop yield formation under arid and semi-arid conditions. In a field experiment, the effects of foliar application of growth regulators of auxin at three levels (0, 20 and 40 mg/L) and cytokinin at three levels (0, 50 and 70 µmol) at pollination stage on yield and yield components of a bread wheat (Shiraz cultivar) and durum wheat (Yavaros cultivar) under drought conditions (normal irrigation and irrigation cut-off at flowering stage) were investigated. This experiment was carried out at college of Agriculture, Shiraz University, Shiraz, Iran, during 2010-2011 as split-split factorial using complete randomized blocks design with three replications. The results showed that drought stress reduced number of grains per spike (25% for Shiraz and Yavaros cv), 1000-grain weight (14 and 30% for Shiraz and Yavaros cv respectively), number of grains per unitarea (30% for Shiraz and Yavaros cv), grain yield (15 and 35% for Shiraz and Yavaros cv respectively), biological yield (13 and 35% for Shiraz and Yavaros cv respectively) and wheat harvest index (15 and 27% for Shiraz and Yavaros cv respectively). Foliar application of auxin and cytokinin under normal irrigation improved grain yield and yield components. Therefore, it was concluded from this research that application of 40 mg/L auxin for bread wheat (Shiraz cv.) and 70 µmol cytokinin for durum wheat (Yavaros cv.) improved grain yield only under normal irrigation conditions.
