Comparison between two types of testers for evaluating new white inbred lines of maize [electronic resource].

By: Language: English Summary language: Arabic Description: p.475-487Other title:
  • المقارنة بين اثنين من الكشافات لتقييم سلالات بيضاء جديدة من الذرة الشامية [Added title page title]
Uniform titles:
  • Annals of agricultural science, Moshtohor, 2004 v.42 (2) [electronic resource].
Subject(s): Online resources: In: Annals of Agricultural Science, Moshtohor 2004.v.42(2)Summary: New white twenty-seven inbred lines of maize were top crossed to the two testers i.e. homozygous inbred line Gm-4 and heterozygous promising single cross Sakha-1 during the 2002 season at Sakha Experimental Station. The resulting 54 top crosses and the two checks SC10 and TWC 324 were evaluated during the 2003 season at two locations, Sakha and Mallawy. The studied traits were silking date, plant and ear heights. grain yield, ear length. ear diameter. number of rows/ear, number of kernels/row and 100 kernel weight. Combining ability analysis was computed via line x tester procedure as proposed by Kempthorne (1957). The results of the present study combined over two locations could be summarized as follows:. The mean squares of locations were highly significant for all traits except number of rows/ear. Significant mean squares due to lines. testers and lines x testers interaction were detected for all studied traits except testers for number of kernels/row. A lines x locations interaction was significant for all traits except number of rows/ear and 100 kernel weight. While testers x locations and lines x testers x locations interactions were not significant for most traits. The non-additive type of gene action were important in controlling the behavior of silking date. plant height. grain yield. ear length, number of kernels/row and 100 kernel weight. While the additive type of gene action played the major contribution in the inheritance of ear height, ear diameter and number of rows/ear. The non-additive types of gene action were more sensitive to environmental differences than additive types of gene action for most traits. Top crosses involving heterozygous SC Sk-1 as a common. tester showed the highest means for all traits and the widest range for all traits except plant height compared with top crosses involving homozygous inbred line Gm-4 as a common tester. Consequently, the heterozygous SC Sk-1 was the best tester for evaluating the inbred lines in top crosses.
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New white twenty-seven inbred lines of maize were top crossed to the two testers i.e. homozygous inbred line Gm-4 and heterozygous promising single cross Sakha-1 during the 2002 season at Sakha Experimental Station. The resulting 54 top crosses and the two checks SC10 and TWC 324 were evaluated during the 2003 season at two locations, Sakha and Mallawy. The studied traits were silking date, plant and ear heights. grain yield, ear length. ear diameter. number of rows/ear, number of kernels/row and 100 kernel weight. Combining ability analysis was computed via line x tester procedure as proposed by Kempthorne (1957). The results of the present study combined over two locations could be summarized as follows:. The mean squares of locations were highly significant for all traits except number of rows/ear. Significant mean squares due to lines. testers and lines x testers interaction were detected for all studied traits except testers for number of kernels/row. A lines x locations interaction was significant for all traits except number of rows/ear and 100 kernel weight. While testers x locations and lines x testers x locations interactions were not significant for most traits. The non-additive type of gene action were important in controlling the behavior of silking date. plant height. grain yield. ear length, number of kernels/row and 100 kernel weight. While the additive type of gene action played the major contribution in the inheritance of ear height, ear diameter and number of rows/ear. The non-additive types of gene action were more sensitive to environmental differences than additive types of gene action for most traits. Top crosses involving heterozygous SC Sk-1 as a common. tester showed the highest means for all traits and the widest range for all traits except plant height compared with top crosses involving homozygous inbred line Gm-4 as a common tester. Consequently, the heterozygous SC Sk-1 was the best tester for evaluating the inbred lines in top crosses.

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