Heterosis and Combining Ability in a Diallel Cross of Eight Faba Bean (Vicia faba L.) Genotypes
Titel:
Heterosis and Combining Ability in a Diallel Cross of Eight Faba Bean (Vicia faba L.) Genotypes
Auteur:
Salem S. Alghamdi
Verschenen in:
Asian journal of crop science
Paginering:
Jaargang 1 (2009) nr. 2 pagina's 66-76
Jaar:
2009
Inhoud:
The present investigation was carried out under insect-free cages during the three successive seasons 2004-2006. A diallel cross excluding reciprocals among eight faba bean genotypes was used to estimate the heterotic effects of F1 crosses and F2 populations relative to their respective mid and better parents and combining ability analysis for yield and some of its variables. Highly significant differences among the tested entries were detected for different traits, indicating wide genetic variability for all traits. Heterosis percentages relative to mid-parents were significantly positive in several crosses with a range of 15.6-19.7, 38.0-59.8, 85.0-131.4, 74.3-79.4, 54.4-127.2 and 69.8-142.0% for plant height, number of branches per plant, number of pods per plant, number of pods per main stem, number of seeds per plant and seed yield per plant, respectively. However, heterosis percentages relative to better parent were significantly positive in some crosses and recorded a range of 19.0-19.0, 54.2-73.7, 62.9-97.7 and 47.6-129.9% for plant height, number of pods per plant, number of seeds per plant and seed yield per plant, in the same order. Some crosses exhibited significantly negative heterosis compared to respective mid-parent for days to flowering (from -9.0-23.5%). The ratios of <img src="../xml/ajcs/2009/images/img1-2k9-2058.gif" width="47" height="18" align="absmiddle"> exceeded the unity for number of pods per plant, number of pods per main stem and 100-seed weight indicating that the genetic variation among these traits appeared to be additive. However, low <img src="../xml/ajcs/2009/images/img1-2k9-2058.gif" width="47" height="18" align="absmiddle"> (less than unity), revealed the predominance of non-additive gene action for days to flowering, plant height, number of branches per plant, number of seeds per plant and seed yield per plant. The three parental genotypes: Aquadulce, Luz and Giza 716 were found to be a good combiners for 100-seed weight. Moreover, the parental genotype Geizera 2 was a good combiner for both number of pods and seed yield per plant. Three parents Geizera 2, Giza 402 and Triple white were good combiners for earliness. Five crosses Geizera 2xGiza 716, Geizera 2xSakha 1, Geizera 2xGiza 402, Giza 716xSakha 1 and Giza 716xGiza 402 had significant Specific Combining Ability (SCA) for most studied traits.
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