Evaluation of relationships between grain yield and agro-physiological traits of bread wheat genotypes under rainfed conditions

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Soleymani Fard A.; NASERI R.

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Journal: Environmental Stresses in Crop Sciences Year:2020 | Volume:13 | Issue:3 Page(s): 701-714

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Title

Evaluation of relationships between grain yield and agro-physiological traits of bread wheat genotypes under rainfed conditions

Author(s)

Soleymani Fard A. | NASERI R. | Issue Writer Certificate

Keywords

Drought stressQ2

Harvest indexQ2

Path analysisQ2

Step-wise regressionQ2

Yield biomassQ1

Abstract

In order to investigate the relationships between agro-physiological traits and grain yield in bread wheat, 14 genotypes under rainfed conditions a field experiment was conducted as in a randomized complete block design with three replications in the research farm of Payame Noor University of Ilam with three replications in the 2016-2017 cropping season. The results of this study showed that the studied genotypes, except for peduncle length and Harvest index, were significantly different from each other in terms of other studied traits. The studied genotypes showed good diversity for most traits. The results of descriptive statistics showed that the highest coefficients of phenotypic and genotypic changes were related to grain yield. Examination of correlation coefficients of traits showed that the highest positive and significant correlation coefficient was between grain yield and biomass (r = 0. 85**). The results of stepwise regression analysis in which grain yield was considered as a dependent variable against other studied traits as independent variables, showed that the three traits of biomass, Harvest index and 1000-grain weight accounted for 98% of the model changes. They justified the relevant regression. By removing biomass traits and Harvest index from independent variables, stepwise regression analysis was performed for grain yield in rainfed conditions. The three traits of proline content, number of spikes per square meter and number of days to maturity in the model explained about 62% of the changes in grain yield in rainfed conditions. The results of Path analysis showed that the most direct positive effects were related to biomass yield, number of spikes per square meter and Harvest index. The results indicate that there is a high genetic diversity among the bread wheat genotypes studied in dryland conditions. Biomass, Harvest index, proline content, number of spikes per square meter and early maturity can be introduced as selection criteria for improving grain yield in dryland conditions.

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APA: Copy

Soleymani Fard, A., & NASERI, R.. (2020). Evaluation of relationships between grain yield and agro-physiological traits of bread wheat genotypes under rainfed conditions. ENVIRONMENTAL STRESSES IN CROP SCIENCES, 13(3 ), 701-714. SID. https://sid.ir/paper/387535/en

Vancouver: Copy

Soleymani Fard A., NASERI R.. Evaluation of relationships between grain yield and agro-physiological traits of bread wheat genotypes under rainfed conditions. ENVIRONMENTAL STRESSES IN CROP SCIENCES[Internet]. 2020;13(3 ):701-714. Available from: https://sid.ir/paper/387535/en

IEEE: Copy

A. Soleymani Fard, and R. NASERI, “Evaluation of relationships between grain yield and agro-physiological traits of bread wheat genotypes under rainfed conditions,” ENVIRONMENTAL STRESSES IN CROP SCIENCES, vol. 13, no. 3 , pp. 701–714, 2020, [Online]. Available: https://sid.ir/paper/387535/en

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