Phenotypic and genotypic variability, heritability and correlation estimates for agro-morphological characteristics of eggplant (Solanum melongena) in Côte d’Ivoire

Kouassi, A.B.; Kouassi, Koffi Brice Aymar; N'Nan, Oulo; Kouassi, Auguste; N’guetta, Assanvo Simon-Pierre

doi:10.20546/ijcrbp.2019.609.003

Cited by 1 publication

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“…In general, very weak to moderate positive or negative phenotypic and genotypic correlations were observed between drought tolerance scores of all the agromorphological characteristics. However, as we reported for phenotypic values of some agromorphological traits (Kouassi et al, 2019), strong positive genotypic correlations were observed between drought tolerance scores of branching index and leaf blade length, the number of stamens per flower and fruit pedicel length, and petiole diameter and plant height, respectively. These strong positive genotypic correlations suggest that drought tolerance abilities, regarding these characteristics, are controlled by genes in linkage disequilibrium and/or with pleiotropic effects (Falconer & Mackay, 1996;Wricke & Weber, 1986).…”

Section: Discussionsupporting

confidence: 79%

“…Kaushik, Prohens, Vilanova, Gramazio, and Plazas (2016), Kouassi et al. (2019), and Prohens et al. (2012) reported heterosis effects for traits related to vegetative growth traits in F 1 progenies of some accessions of eggplant and CWRs.…”

Section: Discussionmentioning

confidence: 98%

“…Thus, unlike cultivated species, wild species, which only benefit from rainfalls for their growth, have developed root systems more suitable for water extraction from the soil in cases of water deficit. Kaushik, Prohens, Vilanova, Gramazio, and Plazas (2016), Kouassi et al (2019), and Prohens et al (2012) reported heterosis effects for traits related to vegetative growth traits in F 1 progenies of some accessions of eggplant and CWRs. As previously reported by Plazas, Vilanova, et al (2016), vigorous vegetative growth of interspecific hybrids could explain the fact that, unlike their parents, the progenies MEL1 × INS2, MEL4 × INS3, MEL6 × ANG1, and MEL6 × DAS1 expressed drought tolerance abilities with regard to vegetative growth characteristics.…”

Section: Discussionmentioning

confidence: 99%

“…(Daunay & Hazra, 2012; Ranil et al., 2017; Vorontsova & Knapp, 2016). Thus, the use of interspecific hybridization has allowed the introgression of genes from wild species into the genetic background of eggplant (Kouassi et al., 2016; Kouassi, Kouassi, Alla‐N'nan, Kouassi, & N'guetta, 2019; Plazas, Vilanova, et al., 2016) and may lead to the widening of its genetic variability. However, the evaluation of drought tolerance of the new genotypes and their use in breeding programs require the definition of reliable phenotypic criteria, transmissible from parental accessions to progenies (Gaufichon et al., 2010).…”

Section: Introductionmentioning

confidence: 99%

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Genetic parameters of drought tolerance for agromorphological traits in eggplant, wild relatives, and interspecific hybrids

Kouassi

Sylla

et al. 2020

Crop Science

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Crop wild relatives (CWRs) have barely been used in eggplant (Solanum melongena) breeding. However, introgression breeding may help in coping with the challenges posed by climate change. During the rainy and dry seasons, we evaluated nine accessions of eggplant, nine accessions of seven related species (of which six are CWRs and one is a cultivated relative), and 12 interspecific hybrids. Drought tolerance scores, calculated as ratios of growing rates and ratios of mean values during the rainy and dry seasons, were obtained for vegetative growth and yield‐related traits. Considering the vegetative growth and yield‐related traits evaluated, the F1 hybrid progenies of eggplant with S. insanum MEL1 × INS2 and MEL4 × INS3, S. anguivi MEL6 × ANG1, and S. dasyphyllum MEL6 × DAS1, plus the S. sysimbriifolium accession SIS1, displayed drought tolerance. Small to large gaps were observed between phenotypic and genotypic CVs of drought tolerance scores, reflecting variable influence of environmental factors on drought tolerance of the traits evaluated. In addition, the narrow‐sense heritability was generally moderate, indicating that genes with dominance and/or epistasis effects may be involved in the expression of drought tolerance. High genotypic correlations for drought tolerance scores between pairs of traits such as branching index and leaf length, leaf petiole diameter and plant height, number of stamens per flower, and fruit pedicel length suggest that drought tolerance of these traits is controlled by genes that are in linkage disequilibrium and/or have pleiotropic effects. The results are relevant for the development of drought‐tolerant cultivars of eggplant.

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Section: Discussionsupporting

confidence: 79%