Pdf effects of drought stress on wheat triticum aestivum l. Drought is a major environmental stress threatening wheat productivity worldwide. Although drought impedes wheat performance at all growth stages, it is more critical during the flowering and grainfilling phases terminal drought and results in. Wheat can adapt to most agricultural conditions across temperate regions. Materials and methods line development and phenotypic measurements. Improving abiotic stress tolerance in wheat requires large scale screening of yield components such as seed weight, seed number and single seed weight, all of which is very laborious, and a detailed analysis of seed morphology is timeconsuming and visually often impossible. The effects of drought stress on yield, yield components, and yield.
Improvement of productivity of wheat cultivars under drought conditions is one of the important breeding objectives in wheat. Pdf drought is one of the most important phenomena which limit crops production and yield. Markers associated with a qtl for grain yield in wheat. Pdf wheat is a staple grain food throughout the globe, in oman it is grown on small scale due to prolonged aridity.
The progress made in understanding drought tolerance is due to advances in three main research areas. Drought and heat stress tolerance screening in wheat using. Yield stability and canopy temperature of wheat genotypes under droughtstress. A comprehensive understanding of the impact of terminal drought is critical for improving drought resistance in wheat, with markerassisted. Abiotic stress conditions are the main limiting factors for crop cultivation around the world.
Drought affects morphology, growth, and metabolism of plants, and limits grain yield in most plants. Computed tomography offers the opportunity for much faster and more accurate assessment of yield components. However, the biggest challenge for this kind of examinations is nor. The occurrence of water stress during wheat growth is more frequent due to. Quantitative pcr qpcr is one of the most common and accurate methods of gene expression analysis. Pdf plants face various kinds of stresses in the changing environment. Among cereal crops, wheat crop status is imperative because of its nutritional value and high. The genes for drought tolerance are regulated at once under drought conditions and produced the respected products that response to signal transduction, stress response and help the plant to withstand under drought stress zhou et al. Among the environmental stresses, drought is one of the most.
Effects of drought stress on wheat triticum aestivum l. Yield losses at vegetative growth stages under drought in wheat. Crops demonstrate various morphological, physiological. Global climate models predict changed precipitation patterns with frequent episodes of drought. This success is the result of phenotypic plasticity conferred by a large and complex genome composed of three homoeologous genomes a, b, and d. Pdf drought stress in wheat during flowering and grainfilling. Major effects of high temperature include the reduction in the crop cycle. Identification of stable reference genes for qpcr studies. In the present study we aimed to improve wheat growth under drought stress conditions through priming with beneficial bacteria considered as plantgrowth promoting bacteria pgpb. Two bacterial strains, bacillus amyloliquefaciens 51 and azospirillum brasilense no40, were used to prime the wheat cv. Drought stress in wheat during flowering and grainfilling.
Selection criteria for droughttolerant bread wheat. The greater intensification of drought stress for maize than wheat with the same gcms and rcps largely reflects that wheat is sown in the autumn with cooler. Improving drought stress tolerance is a very challenging task for wheat and barley researchers and more research is needed to better understand this stress. Does cyclic water stress damage wheat yield more than a. The objective of this work was to identify qtl associated with yield and other agronomic traits under reduced soil moisture.
Markers associated with a qtl for grain yield in wheat under drought. Hotspots in the genomic architecture of field drought. Drought stress is also detrimental to wheat growth some of major. Diverging importance of drought stress for maize and. Although drought is a major cause of yield and quality loss in wheat, the adaptive mechanisms and gene networks underlying drought responses in the field remain largely unknown. Effects of preanthesis drought, heat and their combination on the. The effect of water stress on the yield and yield components of durum wheat.1024 1188 717 1003 1173 897 588 1484 196 488 1069 1026 1457 97 1293 1160 673 389 1376 1411 554 830 599 899 1369 1305 540 517 620 1114 579 649 1085 139