Identifying Wheat Stress Tolerant Genotypes Among Some Bread Wheat Accessions Using Different Drought Tolerance Indices تحديد الطرز الوراثية المقاومة للإجهاد في بعض تراکيب قمح الخبز باستخدام مؤشرات تحمل الجفاف المختلفة

Abstract

Thirty-nine genotypes of bread wheat (Triticum aestivum L.) collected from different regions in Egypt and two commercial varieties were used in this study, to estimate the tolerance indices and to establish the drought tolerance in 41 genotypes. Significant genotypes mean squares were detected for all studied traits, except number of spikes per m 2 and grain per spike under water stress. Using stress susceptibility index (SSI), genotypes 4, 6, 1, 31, 19, and 24 were classified as highly drought tolerant. According to stress tolerance index (STI), twelve genotypes were the top performer under stressed conditions. Twenty-nine genotypes showed lowest STI values (< 0.10) which implies that these genotypes were highly susceptible to drought. The greater values of yield stability index (YSI) were observed in genotypes 8,39,17,22,28,12,26 and 37. Based on sensitivity drought index (SDI) the six genotypes 4,6,1,31,19 and 24 revealed the highest values and were identified as tolerant under stress conditions. According to drought index (DI). Grain yield under stressed conditions (YS) was significantly and positively correlated with STI and DI. Yield in non-stress condition (YP) was significantly and positively correlated with YS, SSI, STI, SDI, and DI and negatively correlated with YSI. The total variation expressed between the two components was 99.70%. The variable that has the highest PCA1 value and the lowest PC2 was found excellent in screening genotypes under stress and non-stress conditions. Also, genotypes 17 and 37 are the most tolerant genotypes under water stress.

SCoT, ISSR, and SDS-PAGE Investigation of Genetic Diversity in Several Egyptian Wheat Genotypes under Normal and Drought Conditions

“…Furthermore, the presence of significant differences between genotypes would suggest the presence of genotypic variance, which indicates the wide diversity between genotypes and water conditions. ese results agree with the study results of Arab et al [43].…”

Assessment of Variability, Heritability and Genetic Advance Toward some Bread Wheat Genotypes for Drought Tolerance Indices

“…The mean performance of 25 genotypes showed that the highest yield value was recorded for Giza 168 followed by Giza 171 under normal irrigation and water stress respectively. The results are similar to those obtained by Abdi et al, (2013) and Arab et al, (2021).…”

“…For MP, a significant correlation coefficient for STI was found to be (**0.94). These results are consistent with the findings of Naghavi et al, (2013), also, these findings are in consistence with the findings of Golabadi et al, (2006), Hooshmandi (2018) and Arab et al, (2021) in wheat. Data analysis of correlation coefficients between drought tolerance indices could be a good phenomenon for selection of genotypes having high stress tolerance by using the best selection indices.…”

Performance of some wheat (Triticum aestivum L.) genotypes and their drought tolerance indices under normal and water stress

“…Therefore, selection based on STI might lead to high-yielding tolerant genotypesMenezes et al (2014),(Abdelghany et. al (2016), Abd El-Kreem et al(2019).,Manal and Samah (2019) andArab et al (2021) reported a high STI rate for the genotype presents its high drought tolerance and its high yield Mevlut and Sait (2011). considered that, the genotypes with high STI have difference in yield under stress and non-stress environment that may be revealed small or minor yield reductions under drought condition.…”