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Combining ability of new white maize inbred lines using top crosses [electronic resource].

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Ibrahim, M. H. A

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Language: English Summary language: Arabic Description: p.1-19Other title:

القدرة على الائتلاف لسلالات جديدة من الذرة الشامية البيضاء باستخدام الهجن القمية [Added title page title]

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Egyptian journal of agricultural research, 2010 v. 88 (1), Special issue [electronic resource]:

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In: Egyptian Journal of Agricultural Research 2010.v.88(1)SPSummary: Twenty seven white maize inbred lines were topcrossed to each of two testers i.e. Gm18 and Sd 34 at Sids Agric. Res. Stn. during 2008 growing season. 56 entries (54 topcrosses + 2 checks, SC 10 and SC 129) were evaluated at Sakha and Sids Agric. Res. Stn. ARC. in 2009 growing season . The obtained results indicated that mean squares of locations, lines (L), testers (T) and L x T were highly significant for all studied traits, except resistance to late wilt and number of ears/plant. The interaction between crosses x locations and their partitions was significant for all studied traits except, days to 50% silking and number of ears/plant. Additive effects were higher than non-additive effects for all the studied traits, except number of earslplant, while the magnitude of SCA x loc. was higher than GCA x foe., indicating that the non-additive gene action was more sensitive to locations comparing to the additive gene action for most of the studied traits. Three inbred lines (L 183, L 193 and L 262) exhibited significant and desirable GCA effects for grain yield under the two locations and their combined while the inbred lines L 173, L 178 and L 200 for earliness, the inbred lines L 262. L 275 and L 287 exhibited significant and desirable GCA effects for plant height and ear position. On the other hand, the tester inbred line Gm18 has desirable significant GCA effects for plant height and number of ears/plant. Tester inbred fine Sd 34 had desirable significant GCA effects for earliness and grain yield. The three top crosses (L 183 x Sd 34), (L 188 x Sd34) and (L 262 x Sd 34) gave high values of grain yield at the two locations and their combined (40.5. 30.1 and 35.3 ard/fed) , (35.9. 33.9 and 34.9 ard/fed) and (38.3, 30.9 and 34.6 ard/fed), respectively and out-yielded the highest check SC 129 (35.9, 26.9 and 31.8 ard/fed.) These crosses would be prospective and more efficient to be used in maize breeding programs.

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Twenty seven white maize inbred lines were topcrossed to each of two testers i.e. Gm18 and Sd 34 at Sids Agric. Res. Stn. during 2008 growing season. 56 entries (54 topcrosses + 2 checks, SC 10 and SC 129) were evaluated at Sakha and Sids Agric. Res. Stn. ARC. in 2009 growing season . The obtained results indicated that mean squares of locations, lines (L), testers (T) and L x T were highly significant for all studied traits, except resistance to late wilt and number of ears/plant. The interaction between crosses x locations and their partitions was significant for all studied traits except, days to 50% silking and number of ears/plant. Additive effects were higher than non-additive effects for all the studied traits, except number of earslplant, while the magnitude of SCA x loc. was higher than GCA x foe., indicating that the non-additive gene action was more sensitive to locations comparing to the additive gene action for most of the studied traits. Three inbred lines (L 183, L 193 and L 262) exhibited significant and desirable GCA effects for grain yield under the two locations and their combined while the inbred lines L 173, L 178 and L 200 for earliness, the inbred lines L 262. L 275 and L 287 exhibited significant and desirable GCA effects for plant height and ear position. On the other hand, the tester inbred line Gm18 has desirable significant GCA effects for plant height and number of ears/plant. Tester inbred fine Sd 34 had desirable significant GCA effects for earliness and grain yield. The three top crosses (L 183 x Sd 34), (L 188 x Sd34) and (L 262 x Sd 34) gave high values of grain yield at the two locations and their combined (40.5. 30.1 and 35.3 ard/fed) , (35.9. 33.9 and 34.9 ard/fed) and (38.3, 30.9 and 34.6 ard/fed), respectively and out-yielded the highest check SC 129 (35.9, 26.9 and 31.8 ard/fed.) These crosses would be prospective and more efficient to be used in maize breeding programs.

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