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首页> 外文期刊>Bulletin of the National Research Centre >Evaluation of 32 F5 Families Derived from Two Interspecific Cotton Crosses for late Planting
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Evaluation of 32 F5 Families Derived from Two Interspecific Cotton Crosses for late Planting

机译：对来自两个种间棉花杂交的32个F5家族进行后期种植的评估

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32 F5 families derived from two interspecific cotton crosses, three parental lines and two check varieties were evaluated in season 2003 under three planting dates March 24, April 22 and May 20 at the Experimental Farm of the National Research Centre at Shalakan, Kalubia Governorate , Egypt. This was done in an attempt to ; select short season cotton genotypes suitable for late cultivation after winter crops (such as bean or wheat) in Southern Delta and Upper Egypt and, to study the association between all studied traits and to identify the superior genotypes using classical selection index. Results obtained indicated that planting dates mean squares were found to be highly significant for all traits studied except position of first fruiting node. Genotypes mean squares were found to be highly significant for all traits evaluated under the three sowing dates and combined data . Combined analysis over three planting dates revealed highly significant genotypes x environment interactions for all traits except position of the first fruiting node . The average number of days to first flower for all populations studied were significantly decreased as planting date was delayed . Correlation coefficients between all possible pairs of traits studied were different in magnitudes from one planting date to another, also, the genotypic correlations were mostly higher in magnitudes than the phenotypic correlations . Path analysis revealed that boll number/plant had the highest direct effect on seed cotton yield followed by boll weight at the three sowing dates. Estimated value of selection index indicated that the ranking of cotton genotypes are not identical in the three sowing dates. It could be concluded that four lines (1, 7, 14 and 27) selected in the late planting date may be exploited in breeding early cotton genotypes which tolerate heat stress in squaring, flowering and boll formation periods.
机译：在2003年第3季（3月24日，4月22日和5月20日）的三个播种日期下，在埃及Kalubia省Shalakan的国家研究中心的试验农场中，对32个F5家族进行了评估，这些家族来自两个种间棉杂交，三个亲本品系和两个检查品种。 。这样做是为了试图;在南部三角洲和上埃及，选择适合于冬季作物（例如豆类或小麦）之后晚耕的短季棉花基因型，研究所有研究性状之间的联系，并使用经典选择指数确定优良的基因型。获得的结果表明，对于所有研究的性状，除了第一个结节的位置，播种期均方均具有很高的意义。基因型均方被认为在三个播期和联合数据下评估的所有性状均具有很高的意义。对三种播种期的联合分析显示，除第一个结实部位的位置以外，所有性状的基因型x环境相互作用都很高。由于推迟播种日期，所有研究种群的第一朵花的平均天数明显减少。从一个种植日期到另一个种植日期，所研究的所有可能性状对之间的相关系数在大小上都不同，而且，基因型相关在幅度上大多高于表型相关。通径分析表明，在三个播种期，铃株数/植物对籽棉产量的直接影响最高，其次是铃铃重。选择指数的估计值表明，在三个播种日期，棉花基因型的排名并不相同。可以得出的结论是，在播种后期选择的四个品系（1、7、14和27）可用于育种可耐受在平方，开花和铃形成期受热胁迫的早期棉花基因型。

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