Association of biochemical traits with grain yield in triticale genotypes under normal irrigation and drought stress conditions

Abstract

Effectiveness of selection of high-yield genotypes under drought stress environments can be improved by using biochemical traits as indirect selection indicators. The objective of this study was to determine the extent to which biochemical traits are associated with triticale grain yield under normal irrigation and drought stress conditions. This field study was conducted to evaluate grain yield and various biochemical traits of 58 triticale genotypes during three consecutive growing seasons (2013-2016). Normal irrigation was applied when 40% of available soil water capacity was depleted. Drought stress was imposed by withholding irrigation for about 40 days from early heading stage to harvest time. In addition to grain yield, proline, malondialdehyde (MDH), hydrogen peroxide (H 2 O 2), protein content, carotenoid, chlorophyll a (Chl a), chlorophyll b (Chl b) and total chlorophyll along with antioxidant enzymes including superoxide dismutase (SOD), peroxidase (POD), ascorbic peroxidase (APX), and catalase (CAT) were measured. The contents of proline, H 2 O 2 , MDH and protein as well as activities of the antioxidant enzymes significantly increased in response to drought stress. Statistical analyses including correlation coefficients, principal component analysis (PCA), stepwise regression and path coefficients revealed that selection of triticale genotypes with low MDH, proline contents and SOD activity as well as high amounts of Chl a and total chlorophyll may improve grain yield under normal irrigation condition. PCA showed negative association between grain yield and antioxidant enzymes under drought stress condition. The results also suggested that low H 2 O 2 and malondialdehyde contents along with high activity of SOD were the selection indicators with significant contributions to triticale grain yield under drought stress condition.

Superoxide dismutase (SOD) as a selection criterion for triticale grain yield under drought stress: a comprehensive study on genomics and expression profiling, bioinformatics, heritability, and phenotypic variability

“…Consequently, our results showed the efficiency of heatmap analysis in screening and breeding programs and also showing a combination of relationships within features, genotypes, and cross relationships between features and genotypes. In accordance with our results regarding the importance of SOD activity, the relationship of biochemical features and grain yield of triticale was modeled in the study of Saed-Moucheshi [ 45 ], without estimation of their heritability and other genotypic parameters, and it showed that showed that MDH, proline contents and SOD were the important features with significant impacts on triticale grin yield. Similarly, Riasat et al [ 43 ] nominated SOD activity as the most appropriate trait to obtain higher tolerant triticale genotypes.…”

“…The obtained data related to field experiments were subjected to combined analysis of variance (combined ANOVA) and descriptive statistic’s, such as mean and standard error. After that, the mean squares (MS) obtained from combined ANOVA for each of normal irrigation and drought stressed trials were used for estimating the residual (res) variance, variance of block (blk) within year (yr), genotype (gn) by year variance, genotypic variance, environmental variance, phenotypic variance, broad sense (general) heritability, genotypic coefficient of variation (GCV), and phenotypic coefficient of variation (PCV) based on the following formulas [ 18 , 45 ]. Mean comparison based on LSD test ( p = 0.05) was carried out using MEANS statement in PROC GLM of SAS software.…”

State of antioxidant and osmoprotective systems in etiolated winter wheat seedlings of different cultivars due to their drought tolerance

“…However, in our experiment, we failed to find a relationship between the proline content in seedling shoots and their drought resistance under stress conditions. A negative correlation between the proline content and drought tolerance was also shown for triticale (Saed-Moucheshi et al, 2019). Despite the importance of proline as a multifunctional protector, a lower increase in its content under moderate stress may indicate a greater resistance of plants (Kuznetsov, Shevyakova, 1999).…”

Role of Compatible Solutes in Alleviating Effect of Abiotic Stress in Plants

“…These environmental strains cause enormous crop damage by decreasing yield by maximum 50% in various plant crops recognized to the increased reactive oxygen species (ROS) that induce oxidative stress in plants (Shafi et al, 2009). Environmental stresses decrease plant growth and development by affecting various physio organic mechanisms for example, hormonal indicating, antioxidant systems and photosynthesis (Jabeen et al, 2019;Saed-Moucheshi;. These abiotic stresses induce [ 142 ] compound responses in crop to inhibit growth and enhanced their survivability under drought stress situations.…”