|
|
Combining ability of new maize yellow inbred lines by using line x tester analysis.
|
|
Abstract: ABSTRACT: New eighteen yellow inbred lines of maize were top crossed with two testers, i.e. line Gz 649 and S.C 52 at Sakha during summer season of 2003. The 36 top crosses and two checks (S.C 3080 and T.W.C. 352) were evaluated at Sakha and Mallawy Agricultural Research Stations during summer season of 2004. Mean squares due to locations were significant for all studied traits except number of rows/ear. Mean squares due to crosses were also significant for all studied traits except ear diameter, while, those due to crosses x loc. interaction were significant for grain yield, plant height and ear height. Mean squares due to lines were significant for all studied traits; those due to testers were significant for grain yield, number of rows/ear, ear diameter, ear length and silking date and those due to lines x testers were significant for grain yield and silking date. On the other hand, mean squares due to (lines x loc) and (testers x loc) interactions were significant for some traits, while those due to (Lines x Testers x loc) interaction were significant for grain yield only. Both additive and non-additive gene action played important role in the inheritance of different studied traits. The inbred lines Sk-6015/23, Sk-6015/24 and Sk-6015/28 exhibited positive and significant GCA effects for grain yield and some of its components. The inbred lines Sk-6015/26 and Sk-6015/34 exhibited negative and desirable significant GCA effects for silking date (towards earliness), while ,the lines Sk-6022/45, Sk-6023/49, Sk-6026/50 and Sk-6026/52 showed negative and favorable significant GCA effects for plant and ear heights (towards shortness). The tester inbred line Gz-649 had desirable significant GCA effects for ear length, while, the tester S.C 52 had desirable significant GCA effects for earliness, ear diameter and number of rows/ear. Four top crosses: Gz-649 x Sk-6015/28 (43.49 ard./fed.), Gz-649 x Sk-6015/35 (42.43 ard/fad.), S.C 52 x Sk 6015/23 (43.34 ard/fad.) and S.C 52 x Sk 6015/28 (44.57 ard/fad) out yielded significantly the commercial hybrid S.C-3080 (36.08 ard/fad) for grain yield and some other traits. Also, six top crosses did not differ significantly form the check hybrid T.W.C. 352 (34.74 ard/fad) for grain yield and most of agronomic traits. These crosses would be prospective, more fruitful, resistant to late wilt disease and there for could be used in maize Breeding program.
Key words: Maize, Zea mays, Line x Tester, Combining ability, Gene action, Top crosses.
|
| Publication year |
2006
|
| Pages |
89-100
|
| Availability location |
معهد بحوث المحاصيل الحقلية - مركز البحوث الزراعية - ش الجامعه – الجيزة
|
| Availability number |
|
| Organization Name |
|
| serial title |
Egypt. J. Plant Breed. 10 (1): 89-100.
|
| Author(s) from ARC |
|
| Agris Categories |
Agricultural research
|
| Publication Type |
Journal
|