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首页> 外文期刊>International Journal of Biosciences >Evaluation of phenotypic variability, genetic parameters, heritability and genetic gain in bread wheat genotypes under rainfed conditions
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Evaluation of phenotypic variability, genetic parameters, heritability and genetic gain in bread wheat genotypes under rainfed conditions

机译：雨育条件下面包小麦基因型的表型变异性，遗传参数，遗传力和遗传增益的评估

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The present investigation was carried out to estimate the genetic variability of agro - physiologicalcharacters using biometrical genetic techniques in bread wheat genotypes under rainfed condition. The results of variance analysis (ANOVA) showed significant differences for stress yield (Ys), relative water content (RWC), evapotranspiration efficiency (ETE) and water use efficiency (WUE) under rainfed conditions indicating the presence of a considerable genotypic variation and possible selection of drought to lerant genotypes under rainfed conditions. Comparison of means showed that the genotype D - 79 - 15 (G8) had the highest, WUE, relative chlorophyll content (RCC), stomatal conductance (SC), the ratio of chlrophyll a/ chlorophyll b (a/b) and Ys. Cluster anal ysis based on grain yield and physiological criteria classified the genotypes in three groups. Group 1 (drought tolerance) consisted of genotypes G3, G4 and G8, group 2 (semi - resistance) included genotypes G7 and group 3 (drought sensitive) discriminated genotypes G1, G2, G5 and G6. High heritability and genetic gain was observed for Ys, RWC, ETE, WUE and a/b. The results of phenotypic and genetic correlation coefficient (Table 4) displayed that RCC, ETE, SC and a/b contributed significantly towards Ys. Hi gh co - heritability was observed between relative water loss (RWL) and Ys (5.042), RWL and WUE (5.317). Positive coheritability estimate was observed between Ys and all other physiological traits suggesting that selection of either of the characters would s imultaneously affect the others positively.
机译：本研究利用生物特征遗传技术估计了雨育条件下面包小麦基因型的农业生理特性的遗传变异。方差分析（ANOVA）的结果表明，在雨养条件下，应力产量（Ys），相对水分含量（RWC），蒸散效率（ETE）和水分利用效率（WUE）存在显着差异，表明存在相当大的基因型变异，并且可能雨养条件下干旱对耐性基因型的选择。均值比较显示，基因型D-79-15（G8）具有最高的WUE，WUE，相对叶绿素含量（RCC），气孔导度（SC），叶绿素a /叶绿素b（a / b）和Ys的比率最高。根据谷物产量和生理标准进行的聚类分析将基因型分为三组。第1组（抗旱性）由基因型G3，G4和G8组成，第2组（半抗性）包括基因型G7和第3组（对干旱敏感）的基因型G1，G2，G5和G6。观察到Ys，RWC，ETE，WUE和a / b具有较高的遗传力和遗传增益。表型和遗传相关系数的结果（表4）显示RCC，ETE，SC和a / b对Ys的贡献很大。在相对失水量（RWL）与Ys（5.042），RWL和WUE（5.317）之间观察到了高gh遗传力。在Ys和所有其他生理性状之间观察到正相关性估计，这表明选择其中一个字符会同时对其他字符产生积极影响。

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