Assessment of stress tolerance in barley (Hordeum vulgare L.) advanced breeding lines under semi arid conditions of the eastern high plateaus of Algeria

Abstract

The yield of 186 F 4 barley breeding lines, under stress and non-stress conditions, utilizing four stress indices: S (stress susceptibility index); P (yield deviation between genotype and best genotype in given environment); b (regression coefficient) and PCA (principal component analysis) scores, was investigated in an experiment carried out at the Agricultural Research Station of the Field Crop Institute of Sétif (Algeria). The results indicated significant differences between lines, with a grain yield mean ranging from 127.3 to 1246.6 g m -2 over the four cropping seasons and a genotype 9 environment variance component 1.83 higher than the genotypic variance component. S index identified divergent plant material under stressed and unstressed environments. Yield differential between lines with high and low S index was large, limiting the use of the S index to compromise between high yield and adaptability. Lines with low S values are high yielding under stress but are less responsive when growing conditions improve. Low P index identified lines with high yield in the unstressed environment and poor yield under stress conditions, while high P identified lines performing poorly in both environments, suggesting that P index was able to integrate both yield potential and yield stability. Lines with a slope b \ 1 showed similar grain yield as those with high P or low S values. Lines with of slope b = 1 have average yield, and as such combine average yield, adaptability and stress resistance. Because of their close mutual relationships, the indices were represented by the first principal component of the PCA, suggesting that PC (principal component) scores would be more appropriate to integrate yield potential and adaptation to variable environments.

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

“…The ranking of genotypes according to grain yield in each year was different indicating different responses of genotypes to different levels of drought. This finding justified the utilization of stress tolerance index to describe the behavior of genotypes under stress and normal conditions [34]. Selection based on just yield cannot be effective but selection through yield and its components has more efficiency.…”

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.…”

A maximin-minimax approach for identifying drought tolerant genotypes based on yield potential and loss in durum wheat

“…The year effect on grain yield was highly significant due to the high year-to-year climatic variation. However, yearly variation in climatic conditions had a large impact on the degree of stress experienced by crops and hence test environments (Benmahammed et al 2010;Mohammadi 2016). There were significant differences among the years in the amount and distribution of rainfall.…”