Genotypic correlation and combining ability of some yellow maize inbred lines via line by tester analysis [electronic resource].

By: Contributor(s): Language: English Summary language: Arabic Description: p.161-177Other title:
  • الارتباط الوراثى والقدرة على التالف لبعض سلالات الذرة الشامية الصفراء من خلال تحليل السلالة x الكشاف.‪‪ [Added title page title]
Uniform titles:
  • Egyptian journal of plant breeding, 2011 v. 15 (1) [electronic resource].
Subject(s): Online resources: In: Egyptian Journal of Plant Breeding 2011.v.15(1)Summary: Twenty six inbred lines were top-crossed with two testers i.e. inbred lines Gm 1002 and Gm 1021 at Mallawy Agric Res. Station in 2009 season. The resulted 52 topcrosses along with two commercial check hybrids i.e. SC 162 and SC 166 were evaluated in replicated yield trails conducted at Sakha and Mallawy Agric. Res. Stations in 2010 season. Results showed highly significant differences between both locations. Mean squares due to lines, testers and lines x testers were significant or highly significant for all studied traits. Mean squares due to lines x locations, testers x locations and lines x testers x locations interactions were significant or highly significant for all studied traits, exceptfor days to 50% silking. Five and six inbred lines possessed positive and significant or highly significant general combining ability effects (GCA) for ears per 100 plant and ear length, respectively. Six inbred lines had positive and significant or highly significant GCA effects for grain yield. For specific combining ability effects (SCA) six, two and three topcrosses had positive and significant SCA effects for ears per 100 plants, ear length and grain yield, respectively.σ² GCAL-was higher than σ² GCA-T for all studied traits, except ears per 100 plants, which indicated that most of GCA variance was due to lines. The ratio of σ² GCA/σ²SCA-was more than unit for days to 50% silking and plant and ear height, indicating that additive gene action played an important role in the inheritance of these traits, while σ² GCA/SCA was less than unity for ears per 100 plants, ear length and grain yield, indicating that non-additive genetic variance was more important in the expression of the latter traits.. Positive and significant genotypic correlation was observed among grain yield and each of days to 50% silking, plant height and ear height The highest grain yield was obtained by two topcrosses i.e. L-8 x Gm 1011 and L-17 x Gm 1021, which significantly out yielded the check hybrid SC 162 by 12.56 and 12.33%, respectively. These two promising single crosses have to be evaluated in the advanced stage for release as new commercial hybrids in Maize Research Programmed.
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Twenty six inbred lines were top-crossed with two testers i.e. inbred lines Gm 1002 and Gm 1021 at Mallawy Agric Res. Station in 2009 season. The resulted 52 topcrosses along with two commercial check hybrids i.e. SC 162 and SC 166 were evaluated in replicated yield trails conducted at Sakha and Mallawy Agric. Res. Stations in 2010 season. Results showed highly significant differences between both locations. Mean squares due to lines, testers and lines x testers were significant or highly significant for all studied traits. Mean squares due to lines x locations, testers x locations and lines x testers x locations interactions were significant or highly significant for all studied traits, exceptfor days to 50% silking. Five and six inbred lines possessed positive and significant or highly significant general combining ability effects (GCA) for ears per 100 plant and ear length, respectively. Six inbred lines had positive and significant or highly significant GCA effects for grain yield. For specific combining ability effects (SCA) six, two and three topcrosses had positive and significant SCA effects for ears per 100 plants, ear length and grain yield, respectively.σ² GCAL-was higher than σ² GCA-T for all studied traits, except ears per 100 plants, which indicated that most of GCA variance was due to lines. The ratio of σ² GCA/σ²SCA-was more than unit for days to 50% silking and plant and ear height, indicating that additive gene action played an important role in the inheritance of these traits, while σ² GCA/SCA was less than unity for ears per 100 plants, ear length and grain yield, indicating that non-additive genetic variance was more important in the expression of the latter traits.. Positive and significant genotypic correlation was observed among grain yield and each of days to 50% silking, plant height and ear height The highest grain yield was obtained by two topcrosses i.e. L-8 x Gm 1011 and L-17 x Gm 1021, which significantly out yielded the check hybrid SC 162 by 12.56 and 12.33%, respectively. These two promising single crosses have to be evaluated in the advanced stage for release as new commercial hybrids in Maize Research Programmed.

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