Evaluation of drought tolerance of winter bread wheat genotypes underdrip irrigation and rain-fed conditions

Abstract

To evaluate the genetic diversity in 48 winter bread wheat genotypes originating from different countries, an experiment based on randomized complete block design with 4 replications was carried out in drip irrigation and rain-fed conditions at the field station of the Transitional Zone Agricultural Research Institute, Eskişehir, Turkey in 2011 and 2012. Based on grain yield under rain-fed and irrigated conditions, drought tolerance indices, i.e. stress susceptibility index (SSI), stress tolerance index (STI), tolerance index (TOL), mean productivity (MP), and geometric mean productivity (GMP), were calculated to identify genotypes with better yield and drought tolerance. Analysis of variance indicated that there were highly significant differences among the genotypes with regard to all the traits under the two experimental conditions. The correlation coefficients showed that STI, MP, and GMP were the most desirable selection criteria for high yielding and drought tolerant genotypes. Based on principle component analysis and biplot, genotypes numbered as 6, 11, 26, 41, 45, and 47 were susceptible genotypes. The genotypes numbered as 4, 12, 17, 24, 27, 28, 34, 35, 36, 38, and 42 were more stable under rain-fed conditions, while genotypes numbered as 9, 29, 31, and 44 were highly adapted to the irrigated conditions. Cluster analysis classified the genotypes into 3 groups: resistant, susceptible, and tolerant to drought conditions. In conclusion, this study showed that drought stress reduced the yield of some genotypes, while others were tolerant to drought, suggesting genetic variability of drought tolerance in this material. Therefore, breeders can select stress-resistant wheat genotypes based on the MP, GMP, and STI indices.

Evaluation of agronomic traits and assessment of genetic variability in some popular wheat genotypes cultivated in Saudi Arabia

“…genotypic and phenotypic coefficient of variation, heritability and genetic advance, can help the breeders to improve the success and efficiency of the selection (Paul et al, 2006). Conventional analysis of variance and statistical parameters like phenotypic (PCV) and genotypic (GCV) coefficients of variability, heritability and genetic advance have been used to assess the nature and magnitude of variation in wheat breeding material (Shankarrao et al, 2010;Afridi et al, 2014;Farshadfar et al, 2013;Farshadfar and Estehghari 2014;Mehari et al, 2015;Mursalova et al, 2015;Ur Rehman et al, 2015;Kamrani et al, 2016 ;Kaya, and Turkoz, 2016). PCV was higher than the corresponding GCV (Amin et al, 2011;Aharizad et al, 2012).…”

Drought Tolerance Indices of Selected Landraces and Bread Wheat (Triticum Aestivum L.) Genotypes Derived From Synthetic Wheats

“…According to average of two years, plant height was reduced 13.8 cm (12.1%) compare to irrigated condition ( Table 4). The less plant height reduction is indirect indicator of tolerance for drought (Mursalova et al, 2015). Plant height were positively correlated with grain yield in rain-fed condition (r = 0.67*) and grain yield in irrigated condition (r = 0.50ns) ( Table 7).…”

“…Two landrace genotypes G1 (Aşure), G5 (Karakılçık) showed poor performance in both irrigated and rainfall conditions, while the other two landrace genotypes G11 (Sorık) and G12 (Bejireş) had a appreciate grain yield in both conditions. Aynehband et al (2011) indicated that modern bread wheat genotypes are more adapted to favorable conditions, while landrace have poor yield in favorable conditions because of their lodging problem and lower response to nitrogen, even their yield under drought stress is appreciate On the other hand, wheat genotypes which carry dwarf genes provide lodging resistance, high nitrogen efficiency and more grain yield in the last decades (Mursalova et al, 2015).…”

“…The present study was performed to determine performance of selected four synthetic derived bread wheat genotypes, four bread wheat landraces and four modern wheat genotypes under rain-fed and supplemented irrigation experiments based on randomized complete block design with four replications at GAP International Agricultural Research and Training Center, Diyarbakır, Turkey in 2013-2014-2015 growing seasons. According to results of pairwise correlation and biplot analysis, significant and positive correlation was observed between grain yield in stress condition (Ys) and stress tolerant index (STI), geometric mean productivity (GMP), mean productivity (MP), harmonic productivity (HM), yield stability index (YSI), yield index (YI), drought resistance index (DI) and stress non-stress production index (SNPI) indicating these indices can be used as parameters for evaluating drought tolerant genotypes.…”

Evaluation of Crop Coefficient, Cumulative and Dynamic Evapo-Transpiration of Winter Wheat under Deficit Irrigation Treatments in Weighing Lysimeter in Beijing, China

“…Water is a key driver of agricultural production in the world and provides more than a quarter of the total world cereal output (Shekari et al, 2015;Mursalova et al, 2015). In the past four decades, annual cereal production increased 3.8-fold from 100 million tones in 1961 to 410 million tones in 2004 (FAO, 2005).…”