Combining ability of new maize inbred lines by line x tester analysis.
Abstract: ABSTRACT: Fourteen inbred lines were top-crossed to three testers, i.e. SK-7001/8, SCSK-17 and Gz-2 at Sakha in 2002 season. The top-crosses were evaluated in 2003 at Sakha and Gemmeiza locations. Significant differences were detected between two locations for all the studied traits. Mean squares of crosses and their partitioning into lines and testers were significant for all studied traits except for ear diameter for lines and testers. Moreover, mean squares due to lines × testers interaction were highly significant for grain yield, plant height. While, it was significant for ear length, ear height and weight of 100-grains. The best desirable GCA effects for grain and most yield components were obtained by inbred lines SK-63-32 and SK-58-30. Also, the inbred lines SK-62-11, SK-62-12 and Sk-62-13 showed the best GCA effects for silking date, plant and ear height towards earliness and short plants, respectively. The inbred tester SK-7001/8 showed the best desirable GCA effects for number of rows/ear. Moreover, the tester SCSK-17 was the best combiner for grain yield and number of kernels/row. While, the tester Gz-2 was the best general combiner for earliness and short plants. Two top crosses, SK-63-32 × SK-7001/8 and SK-63-32 × SCSK-17 did not differ significantly from the check variety SC10. Moreover, fourteen top crosses exhibited significant differences than check variety TWC310. Also, most of the remainder top crosses did not differ significantly from the last check (TWC 310). These crosses can be used in maize breeding program. The additive genetic variance was more important for grain yield, weight of 100-grain, plant height and ear height. While, non-additive genetic variance was an important for number of kernels/row, ear diameter and silking date. Moreover, non-additive genetic variance was more affected interacted by locations than additive genetic variance for all studied traits except number of kernels/row and ear diameter.
Key words: Maize, Zea mays L., Line × tester, Combining ability, Top crosses.
Publication year 2004
Pages 4349-4356
Availability location معهد بحوث المحاصيل الحقلية - مركز البحوث الزراعية - ش الجامعه – الجيزة
Availability number
Organization Name
serial title J. Agric. Sci. Mansoura univ., 29(8): 4349-4356.
Author(s) from ARC
Agris Categories Agricultural research
Publication Type Journal
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