Heritability, combining ability and inheritance of storage root dry matter in yam beans

Agaba, Rolland; Tukamuhabwa, Phinehas; Rubaihayo, Patrick; Mwanga, R.O.M.; Ssenyonjo, A; Ndirigwe, J.; Tumwegamire, Silver; Grüneberg, Wolfgang J.

doi:10.4314/acsj.v25i1.6

Cited by 6 publications

(12 citation statements)

References 22 publications

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“…P. ahipa 9 P. tuberosus 'Ashipa' yielded non-functional seeds (Grum 1990;Sørensen 1991;Grüneberg et al 2003;Agaba et al 2017). From the breeder's perspective, the species form one primary genepool.…”

Section: Introductionmentioning

confidence: 99%

Genetic diversity in cultivated yam bean (Pachyrhizus spp.) evaluated through multivariate analysis of morphological and agronomic traits

Zanklan

Becker

Sørensen³

et al. 2017

Genet Resour Crop Evol

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Yam bean [Pachyrhizus DC.] is a legume genus of the subtribe Glycininae with three root crop species [P. erosus (L.) Urban, P. tuberosus (Lam.) Spreng., and P. ahipa (Wedd.) Parodi]. Two of the four cultivar groups found in P. tuberosus were studied: the roots of 'Ashipa' cultivars with low root dry matter (DM) content similar to P. erosus and P. ahipa are traditionally consumed raw as fruits, whereas 'Chuin' cultivars with high root DM content are cooked and consumed like manioc roots. Interspecific hybrids between yam bean species are generally completely fertile. This study examines the genetic diversity of the three crop species, their potentials for breeding and the identification of useful traits to differentiate among yam bean genotypes and accessions. In total, 34 entries (genotypes and accessions) were grown during 2000-2001 at two locations in Benin, West Africa, and 75 morphological and agronomical traits, encompassing 50 quantitative and 25 qualitative characters were measured. Diversity between entries was analyzed using principal component analysis, cluster analysis, multivariate analysis of variance and discriminant function analysis. Furthermore, phenotypic variation within and among species was investigated. Intraand interspecific phenotypic diversity was quantified using the Shannon-Weaver diversity index. A character discard was tested by variance component estimations and multiple regression analysis. Quantitative trait variation ranged from 0.81 (for total harvest index) to 49.35% (for no. of storage roots per plant). Interspecific phenotypic variation was higher than intraspecific for quantitative traits in contrast to qualitative characters. Phenotypic variation was higher in overall for quantitative than qualitative traits. In general, intraspecific phenotypic variation ranged from 0.00 to 82.61%, and from 0.00 to 80.03% for quantitative and qualitative traits, respectively. Interspecific phenotypic variation ranged from 0.00 to 95.02%, and 0.00-81.58% for the two trait types, respectively. The Shannon-Weaver diversity index (H′) was in general high and over 0.80 for most of the trait. Diversity within P. tuberosus was higher than within P. erosus and P. ahipa. Across the 50 quantitative and 25 qualitative traits, the ShannonWeaver diversity index of intra-and interspecific variation was around 0.83 and 0.51, respectively and was lower for qualitative than for quantitative traits. Monomorphism was observed in eight qualitative traits and one quantitative character. The first, second and third principal components explained, respectively, 39.1, 21.3 and 8.3% of the total variation in all traits. Pachyrhizus erosus, P. ahipa, and P. tuberosus ('Chuin' and 'Ashipa') were clearly separated from each other by these analyses. Multivariate analysis of variance indicates significant differences between Pachyrhizus species for all individual or grouped traits. Discriminant function analysis revealed that the first two discriminant functions were almost significant. Biases due to unbalanc...

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Section: Introductionmentioning

confidence: 99%

Genetic diversity in cultivated yam bean (Pachyrhizus spp.) evaluated through multivariate analysis of morphological and agronomic traits

Zanklan

Becker

Sørensen³

et al. 2017

Genet Resour Crop Evol

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“…High dry matter yam bean cultivars have been proposed as the most important goal for future improvement programs in Africa (Agaba et al 2017). Recent research by Zanklan et al 2018 stated that breeding is aiming to combine the wide adaptation of P. erosus, the storage root quality of the chuin cultivar of P. tuberosus and the bushy-erect growth type, early maturity and day length insensitivity of P. ahipa so as to improve the agronomy, yields and quality traits of the yam beans.…”

Section: Introductionmentioning

confidence: 99%

“…Against this background, Agaba et al (2017), investigated inheritance of storage root dry matter and revealed significant GCA and SCA effects and high heritability for dry matter content and associated traits in interspecies yam bean breeding populations. The findings suggested that expression of root dry matter is controlled by additive gene effects with potential for quick responses to early generation selection.…”

Section: Introductionmentioning

confidence: 99%

“…Even with research for nearly two decades in Africa, the yam bean is yet to be widely adopted or prioritized by research institutions, farmers and agroindustries mainly because the storage roots are low in dry matter content (\ 25%) (Agaba et al 2017). The popular root crops such as cassava, sweetpotato, and yams are preferred given they have high dry matter content for consumption and industrial applications (Tumwegamire et al 2011).…”

Section: Introductionmentioning

confidence: 99%

“…Yam beans should be popularised not as a competition to existing root crops but as a source of protein and micronutrients to root crop dependent communities. Nevertheless, a high dry matter yam bean would be easy to promote for adoption among small holder farmers (Agaba et al 2017).…”

Section: Introductionmentioning

confidence: 99%

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Genetic variation and response to selection for storage root dry matter and associated traits in a population of yam bean (Pachyrhizus spp.) interspecies crosses

et al. 2021

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The goal of yam bean improvement in Africa is to develop superior high yielding and high dry matter cultivars that are preferred for adoption. In this study, the estimates of variance components, heritability and response to selection were studied in F3 yam bean families selected from interspecies crosses targeting improvement of storage root dry matter and associated traits. Breeding populations were generated using North Carolina II (NC II) mating design involving high dry matter P. tuberosus chuin cultivar, low dry matter P. ahipa and the high yielding P. erosus yam beans. The progenies were advanced through selfing from F1 to F2 population and then exposed to selection at 10% selection intensity to obtain 83 high dry matter lines. The selected lines were evaluated in an F3 trial using a randomized complete block design (RCBD) with three replications at the National Crops Resources Research Institute (NaCRRI) Namulonge, in Central Uganda. The results revealed significant (P < 0.001) genetic variation for storage root dry matter (RDM), storage root fresh yield (RFY), storage root dry yield (RDY), vine yield (VNY), fresh biomass yield (FBY), harvest index (HI), starch (STA) and protein (PRO) content. High genotypic coefficient of variation (GCV) and phenotypic coefficient of variation (PCV) were obtained for VNY, RDY, FBY, RFY, RDM and STA. Narrow sense heritability was higher than 0.5 and response to selection was 15.5 to 33.1 for RDM, RFY, RDY, VNY, FBY and STA, indicating rapid genetic progress is achievable and early generation selection would be effective to improve these traits. Significant (P < 0.01) positive genetic correlations were observed between RDM, RDY, RFY, VNY, FBY and STA ranging from 0.422 to 0.963 implying that simultaneous improvement of these traits is possible in the current yam bean populations.

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Combining ability and gene action for agronomic traits and Fusarium wilt resistance in pigeonpea

Yohane

Shimelis

Laing

et al. 2022

Journal of Crop Improvement

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Heritability, combining ability and inheritance of storage root dry matter in yam beans

Cited by 6 publications

References 22 publications

Genetic diversity in cultivated yam bean (Pachyrhizus spp.) evaluated through multivariate analysis of morphological and agronomic traits

Genetic diversity in cultivated yam bean (Pachyrhizus spp.) evaluated through multivariate analysis of morphological and agronomic traits

Genetic variation and response to selection for storage root dry matter and associated traits in a population of yam bean (Pachyrhizus spp.) interspecies crosses

Combining ability and gene action for agronomic traits and Fusarium wilt resistance in pigeonpea

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