Screening Wheat Genotypes for Specific Genes Linked to Drought Tolerance

Area of Science:

• Agricultural Science
• Plant Breeding
• Genetics

Background:

• Drought stress is a major threat to wheat production, significantly impacting growth and grain yield.
• Developing drought-tolerant wheat cultivars with high yield potential is a key objective for wheat breeders globally.

Purpose of the Study:

• To screen drought-tolerant wheat genotypes for specific drought tolerance genes.
• To evaluate the impact of drought stress on key spike traits in wheat.
• To identify superior genotypes for breeding programs aimed at enhancing drought tolerance.

Main Methods:

• Screening of seven drought-tolerant wheat genotypes for 19 specific drought tolerance genes.
• Evaluation of spike traits (spike length, grain number per spike, number of spikelets per spike, grain yield per spike) under normal and drought conditions over two seasons.
• Analysis of variance (ANOVA) and drought tolerance indices to assess genetic variation and tolerance levels.

Main Results:

• Drought stress significantly reduced all four measured spike traits, with grain number per spike and grain yield per spike showing the largest decreases.
• High genetic variation was observed among genotypes for all traits under both conditions.
• Omara 007 exhibited the highest drought tolerance, while Giza-36 genotypes showed the lowest.
• Eleven of the 19 genes screened were polymorphic; Omara 007 and Omara 002 possessed the most drought tolerance genes (nine).

Conclusions:

• The study identified specific drought tolerance genes and superior genotypes, like Omara 007, for breeding programs.
• Genetic variation among genotypes provides a basis for selecting parents for crosses to improve drought tolerance.
• Findings support the use of genetic screening and trait evaluation for developing climate-resilient wheat varieties.