Genetic Parameters, Multivariate Analysis and Tolerance Indices of Rice Genotypes under Normal and Drought Stress Environments

Abstract

In order to evaluate genetic parameters and drought tolerance indices using multivariate analysis, seventeen genotypes of rice were evaluated under normal and drought conditions. The combined analysis of variance indicated highly significant effects of genotype on all studied traits under normal and drought conditions. Most studied genotypes were better than the grand mean during normal and drought conditions. Drought stress reduced the studied traits while other was tolerant to drought, suggesting genetic variability in these genotypes for drought tolerance. The environmental and genetic variances and heritability showed highly significant for all studied traits under normal and drought conditions. The maximum values of genetic variance were found for all studied traits followed by the environmental and genotypes × season variances at normal and drought conditions. High heritability coupled with high genetic advance as percent of the mean was observed for most studied traits under normal and drought conditions. The differences between phenotypic coefficients of variation (PCV%) were higher than the values of genotypic coefficients of variation (GCV%) for all

Determination of Drought Tolerance Indices as Selection Criteria of Rice Genotypes under Water Deficit Conditions in Egypt

“…According to combined ANOVA analysis of nonstress (Yp) and stress (Ys) conditions as well as drought tolerance indices (Table 5), grain yield (Yp and Ys) and all drought tolerance indices exhibited highly significant between genotypes (G). El-Hashash and EL-Agoury [37] had previously found similar findings. The findings demonstrated that almost all indices showed a significant genetic variation and could distinguish between genotypes under stress and non-stress conditions.…”

“…Therefore, those drought tolerance indices were not influenced mainly by year effect. El-Hashash and EL-Agoury [37] reported that a highly significant variation was observed in grain yield and tolerance indices among the studied rice genotypes, while, there were no significant differences between the two study years in terms of grain yield and tolerance indices. Saad et al [39] mentioned that significant differences were observed between years and genotypes for most studied drought indices.…”

“…The findings demonstrated that almost all indices showed a significant genetic variation and could distinguish between genotypes under stress and non-stress conditions. Also, these findings showed that genotypes varied for the genes influencing yield and drought tolerance indices [37]. However, the efficient indices should also be able to select genotypes that combine high yield with drought tolerance [38].…”

Characterization of some Agronomic Traits and Salinity Tolerance Indices Under Normal and Saline Soil Conditions in Rice

“…In general, the grain yield ranged between 6.34 and 9.55 t ha -1 , the promising lines RGA-13 and RGA-14 had the highest grain yield, 9.31 and 9.55 t ha -1 . This conclusion supported the use of a stress tolerance index to reflect genotypes behavior under stress and normal conditions (Benmahammed et al, 2010;El-Hashash et al, 2018). Selection based on just yield is ineffective, whereas selection based on yield and its components is more efficient.…”

Cluster Analysis and SSR (Simple Sequence Repeats) Primers Selection for Aluminium Tolerance on Hot Pepper

“…Variabel yang diamati meliputi tinggi tanaman, diameter batang, panjang akar, volume akar, bobot segar akar, bobot kering akar, bobot segar tanaman, bobot kering tanaman. Penentuan ITC dilakukan menggunakan rumus sebagaimana dalam penelitian El-Hashash et al (2018).…”