Abstract Detail

Agronomy

Tefera, Abeya Temesgen [1], Sarial, Ashok Kumar [2], Aga, Amsalu Ayana [3].

Reciprocal cross effects due to maternal gene on common bean (Phaseolus vulgaris L).

Hybridization of 4 x 4 complete diallel including reciprocal crosses and evaluation of parental genotypes and F₁ hybrids of common bean (Phaseolus vulgaris L.) were undertaken at Bako Agricultural Research Center in Ethiopia. The objective of this study was to investigate the reciprocal cross effects caused by maternal or cytoplasmic genes on common bean hybrids. The overall results indicated that reciprocal cross effects were not significant (P ≤ 0.05) for days to flowering, days to maturity, number of pods per plant, number of seeds per pod, number of seeds per plant, pod length, pod diameter, plant height, total seed protein and seed yield in common bean. However, at the first filla generation, Gobe Rasha x Roba and Dimitu x Gobe Rasha crosses showed significant and negative reciprocal cross effects for seed size. This effect is important as it directs the plant breeders in the choice of male and female parents during the course of hybrid development. In addition, the F₁ crosses obtained by the combination of Roba-1, Gobe Rasha and Attendaba varieties with EMP-236 genotype produced unique seed color as compared to their parents. This finding could be explained in terms of modified gene action, the concept which was not considered by Mendel. Further analysis was undertaken in the second filla generation to investigate the persistence of this difference into the F₂ hybrids, which indicate the effects are due to maternal or cytoplasmic genes. Nevertheless, there was no significant difference observed for seed size at second filla generation. This clearly showed that reciprocal effects due cytoplasmic genes were not evident in our crosses, suggesting that nuclear genes were responsible for the inheritance of the traits in common bean (Phaseolus vulgaris L.).

1 - Bako Agricultural Research Center, Breeding and Genetics, West Shoa, P.O.Box 3, Bako, Oromia, Ethiopia
2 - Addis Ababa University, Biology , P.O.Box 1176, Addis Ababa, Addis Ababa, Ethiopia
3 - Oromia Agricultural Research Institute , Crop Research , P.O.Box 8126, Addis Ababa, Addis Ababa, Ethiopia

Keywords:
Maternal effect
nuclear gene
reciprocal cross.

Presentation Type: Oral Paper:Papers for Topics
Session: 37
Location: Salon 2/The Shaw Conference Centre
Date: Tuesday, July 28th, 2015
Time: 11:00 AM
Number: 37011
Abstract ID:106
Candidate for Awards:Margaret Menzel Award