Evaluation of grain yield indices in hexaploid wheat genotypes in response to drought stress

Abstract

Drought stress limits crop production in the world. Therefore, employing high-yielding cultivars tolerant to drought is an effective approach to reduce its detrimental effects. To identify drought tolerant genotypes, 36 wheat genotypes were evaluated during the 2010-2011 and 2011-2012 growth seasons. A field experiment was conducted in a split plot design with two irrigation treatments (100% field capacity until harvest and no irrigation after anthesis) as main plots in three replications and genotypes as subplots. Grain yield, its components and drought tolerance indices were measured. Results showed a significant reduction in yield and its components under drought conditions. Grain yield had significant positive correlations with stress tolerance index (STI), mean productivity index (MP) and geometric mean productivity (GMP) while it was negatively correlated with stress susceptibility index (SSI) and tolerance index (TOL) under stress condition. These results indicated that superior genotypes could be selected based on high values of STI, MP and A c c e p t e d M a n u s c r i p t Downloaded by [University of Arizona] at 04:19 05 July 2014 GMP and low value of SSI. The results were validated by principal component analysis (PCA) as it showed genotypes with high PC1 and low PC2 were more desirable. Based on the results, genotypes number 8, 11, 17, 30, 34 and 35 were recognized as suitable for both conditions.

Relationship Among Agro-Morphological Traits in Bread Wheat (Triticum aestivum) Genotypes Under Irrigated and Rainfed Conditions

“…Warrington et al (1977) explained that drought stress at anthesis may lead to yield loss by reducing TKW and if accompanied with high temperatures after anthesis, accelerates whole plant senescence and reduces biological yield and HI. Bayoumi et al (2008) and Dorostkar et al (2015) observed that grain yield, biological yield, HI and TKW decreased under stress condition.…”

Effects of supplemental irrigation based on soil moisture levels on photosynthesis, dry matter accumulation, and remobilization in winter wheat (Triticum aestivum L.) cultivars

“…Grain number and single grain weight are reduced under drought stress or waterlogging stress in grain filling stage (de San Celedonio et al, 2014;Zhang et al, 2014), which results in significant reduction in yield (Dorostkar et al, 2015). Irrigation can increase the duration of grain filling by prolonging the functional period of leaves, which can in turn increase grain weight (Verma et al, 2004).…”

Rank based stability measures to select stable and adapted dual purpose barley (Hordeum vulgare L) genotypes

“…Researchers have highlighted the importance of changes in cultivars rank in multi environments trials as evident from literature (Dorostkara et al, 2015). Non parametric measures were based on ranks and stable genotypes possess relatively constant rank across environments (Asghar et al, 2008;Delić et al, 2009).…”