Application of Physiological Traits Related to Plant Water Status for Predicting Yield Stability in Wheat under Drought Stress Condition

Abstract

The objective of the present study was to model the relationship between yield stability index (YSI) and some physiological traits related to plant water status. Fifteen bread wheat (Triticum aestivum L.) genotypes with wide range of sensitivity to drought were used in a randomized complete block design with three replications under two different environments (irrigated and rainfed) in 2012-2013 at the experimental farm of College of Agriculture, Razi University, Kermanshah, Iran. The results showed that YSI had positive and significant relationship with relative water protection (RWP, r = 0.858**), relative water content (RWC, r = 0.594*), canopy temperature depression (CTD, r = 0.669**), stomata resistance (SR, r = 0.643**) and evapotranspiration efficiency (ETE, r = 0.818**), and negative significant correlation with relative water loss (RWL, r = -0.822**) and excised leaf water loss (ELWL, r = -0.543*) under drought stress condition. Also ETE (0.46*) and RWP (0.806) had the highest direct and indirect effects on YSI, respectively. Multiple linear regression analysis indicated that the predicting model for YSI explained 97.9% of the total variation within the measured traits. The residual plots analysis indicated no problem in the model with selected variables. On the other hand, t-test showed that some of the variables are not important to be present in this model. The results of path and stepwise multiple linear

Enhanced stress tolerance in transformed Ajuga bracteosa Wall. ex Benth. regenerants by upregulated gene expression of metabolic pathways

“…Relative water content is an important variable used to evaluate the metabolic activity, physiological water status, and survival of plants under water deficit (Hasheminasab et al, 2014). In the present study, transgenic leaves had significantly higher (P < 0.001) RWC compared to the wild leaves under drought (Figure 5c).…”

Assessment of durum wheat (Triticum durum Desf.) genotypes based on their agro-physiological characteristics and stress tolerance indices

“…Stress tolerance (STI), yield stability (YSI) and superiority genotypic (Pi) indices were, among several other indices, proposed as potential tools to identify high yielding, stable and/or stress tolerant genotypes Binns, 1988, Farshadfar et al, 2018). Stress-induced cell membrane injury, relative water contain, rate of excised flag leaf water loss, canopy temperature, and leaf chlorophyll contain were rated as promising screening tools in the search of stress tolerance (Hura et al, 2007;Hasheminasab et al, 2014;Saed-Moucheshi et al, 2016). In this context, Awan et al (2015) reported that grain yield was closely linked to relative water content, cell membrane stability and specific flag leaf area.…”

Attitude toward organic agribusiness: an approach to developing sustainable business

“…If the values of VIF are higher than 10 and the tolerance index is close to zero, it shows a multicollinearity between the research variables. However, the closer these two statistics are 1, show that the non-collinearity between the predictor variables and the appropriateness of the regression model (Hasheminasab et al, 2013). Based on the results presented in Table 4, it can be seen that the statistics of VIF and tolerance index have ideal values; therefore, the regression model of this study has a good fit.…”