基于纤维性状的棉种质遗传变异评价

IF 4.3 3区 材料科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC
Manivannan Alagarsamy
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引用次数: 0

摘要

barbadense棉在长度,强度和细度方面具有特定的纤维,被称为超长短纤(ELS)棉,海岛棉或埃及棉。barbadense的遗传基础狭窄,遗传变异较小。因此,本研究旨在评价108份巴贝多种质资源的遗传变异,并根据纤维性状鉴定出优良的基因型。结果我们对108个材料进行了5个纤维质量性状和3个增强块设计检查。所有纤维性状在基因型间差异显著,表明存在遗传改良潜力。纤维强度和马克隆(MIC)表现出较高的表型和基因型变异系数。在纤维长度、强度和马克隆值方面,记录了高遗传率和高遗传进步(GAM)。纤维强度与纤维长度呈极显著相关,与马克隆呈负相关。主成分分析和双图分析表明,均匀性指数对所有基因型的判别能力较高,而纤维长度和强度的判别能力中等。双图显示,基因型DB 16、EC959191、GSB 39、ARBB 20、5746U、EA 203和EA 201具有遗传多样性。基于UPGMA算法的分层聚类分析将基因型分为4个聚类,每个聚类分别包含4个、18个、48个和38个基因型。结论纤维长度基因型34个;35 mm), 18为纤维强度(>40.4 g·tex−1)和66 g·micronaire (3.7-4.2, A级)是具有优势的候选品种。本研究鉴定的优良纤维基因型是ELS棉花育种计划的潜在品系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing genetic variation in Gossypium barbadense L. germplasm based on fibre characters
Abstract Background Gossypium barbadense L. has specific fibre in terms of its length, strength, and fineness, and known as extra-long staple (ELS) cotton, Sea–Island cotton, or Egyptian cotton. Narrow genetic base with less genetic variability is observed in G. barbadense germplasm. Hence, this study was aimed to evaluate the genetic variability present in 108 germplasm accessions of G. barbadense and to identify the superior genotypes based on the fibre traits. Results We evaluated 108 accessions for five fibre quality traits along with three checks in augmented block design. All fibre traits showed significant differences among genotypes, indicating that there is genetic potential for improvement. Fibre strength and micronaire (MIC) showed high phenotypic and genotypic coefficients of variation. High heritability combined with high genetic advance as percentage of mean (GAM) was recorded for fibre length, strength, and micronaire. Fibre strength and fibre length were significantly correlated with each other, while both showed negative correlation with micronaire. Principal component analysis and Biplot analysis showed that uniformity index discriminated all the genotypes in higher level, while fibre length and strength were medium in discrimination power. Biplot revealed genotypes DB 16, EC959191, GSB 39, ARBB 20, 5746U, EA 203, and EA 201 were genetically diverse. Hierarchal cluster analysis based on unweighted paired group method using arithmetic average (UPGMA) grouped the genotypes into four clusters, with each cluster consisting of 4, 18, 48, and 38 genotypes, respectively. Conclusion Among the genotypes, 34 for fibre length (> 35 mm), 18 for fibre strength (> 40.4 g·tex −1 ) and 66 for micronaire (3.7-4.2, A grade) were identified as potential accessions based on their superiority. The superior fibre genotypes identified in this study are potential lines for the ELS cotton breeding program.
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来源期刊
CiteScore
7.20
自引率
4.30%
发文量
567
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