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Study of water deficit tolerance of corn parents and hybrids under normal and deficit irrigation conditions basis agrphysiological traits
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Somaye Zallaghi   , Zahra Khodarahmpour * , Aziz Afarinesh , Mohammad Motamedi , Seyed Keyvan Marashi |
| Associate Professor, Department of Production Engineering and Plant Genetics, Sho.C., Islamic Azad University, Shoushtar, Iran. |
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Abstract: (372 Views) |
| Khuzestan, as one of the most important corn producing provinces in the country, lacks improved varieties adapted to very hot and dry conditions. Morphological examination of germplasm is the first step in describing and grouping genotypes. In this experiment, six lines and their one-way hybrids with the SC704 control were evaluated under two conditions of normal and deficit irrigation in a randomized complete block design with three replications in the summer of 2019 at the Safiabad Agricultural Research and Education Center of Dezful. The results showed considerable variation among lines and hybrids. The results showed a significant variation among lines and hybrids in terms of all phenological, morphological and physiological traits studied. In factor analysis, considering eigenvalues greater than one, in normal irrigation conditions the first two factors and in deficit irrigation conditions the first three factors explained 69.4 and 80.1 percent of the variance between traits, respectively. The results of cluster analysis for grouping genotypes in both conditions and cutting the resulting dendrogram by Ward's method using standard data and Euclidean distance resulted in the creation of three groups. Based on multivariate analyses and the best stress tolerance indices (MP, GMP, STI and HA) in this study, lines C4-95-2, C4-95-6 and C4-95-23 were among the 6 lines studied and hybrids C4-95-2× C4-95-23, C4-95-2× C5-95-6 and C4-95-6×C4-95-23 were the best genotypes in both conditions and increased growth rate, higher yield and tolerance to water deficit. 3 lines C5-95-4, C5-95-12 and C6-95-5 performed poorly in both conditions and were sensitive to water deficit. The selected lines are suitable bases for crossing and hybridization, and the best hybrids are also suitable for cultivation under the conditions this study. |
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| Keywords: Biplot, Cluster analysis, Principal components analysis, Tolerance index |
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Full-Text [PDF 703 kb]
(128 Downloads)
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Type of Study: Research |
Subject:
Abiotic Stresses
Received: 2025/07/29 | Accepted: 2025/09/1 | Published: 2025/09/1
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