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Evaluation of vegetative growth, yield and quality related traits in taro (Colocasia esculenta [L.] Schott)

Soulard Laurent, Letourmy Philippe, Cao Tuong-Vi, Lawac Floriane, Chaïr Hâna, Lebot Vincent. 2016. Evaluation of vegetative growth, yield and quality related traits in taro (Colocasia esculenta [L.] Schott). Crop Science, 56 (3) : pp. 976-989.

Journal article ; Article de recherche ; Article de revue à facteur d'impact
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Quartile : Q2, Sujet : AGRONOMY

Abstract : Taro (Colocasia esculenta [L.] Schott) breeders apply heavy selection pressure on yield during the seminal (F1) and first clonal generations (C1). However, the genetic gain achieved with this practice has never been evaluated and prior accurate assessment of the genetic control of the traits under selection is required. The present study aimed at evaluating broad-sense heritability, between-trait and between-generation correlations, and genetic gain for traits related to vegetative growth, yield, and corm quality. A fully randomized-block trial consisting of 13 full-sib families (1890 genotypes) was set up and measured in F1and C1 generations. ANOVAs were performed with mixed models, considering spatial autocorrelations when necessary. Chi-square tests revealed the stability of the presence or absence of stolons, suckers, and inflorescences between F1 and C1, suggesting strong genetic control for such organs. Highly fitted models resulted in particularly accurate predicted genetic values. Heritability and genetic gain computations assumed unbalanced data and gave rather high values. The number of stolons, the number of suckers, fresh corm weight, and dry matter content were found to be the most heritable traits. Mass and family selection strategies were tested and revealed moderate to high genetic gain for most heritable traits in both generations. Selection indexes such as the vegetative growth index and future breeding strategies are discussed. Results could be of interest for breeding in other aroid crops. (Résumé d'auteur)

Mots-clés Agrovoc : Colocasia esculenta, Amélioration des plantes, Gain génétique, Rendement des cultures, Croissance, Qualité, Héritabilité, Caractère agronomique, Collection de matériel génétique, Anatomie végétale, Sélection

Mots-clés géographiques Agrovoc : Vanuatu, Asie du Sud-Est, Océanie

Mots-clés libres : Taro, Colocasia esculenta, Génétique, Amélioration, Caractères morphologiques, Héritabilités

Classification Agris : F30 - Plant genetics and breeding
F62 - Plant physiology - Growth and development
F50 - Plant structure
F01 - Crop husbandry

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

Auteurs et affiliations

  • Soulard Laurent, CIRAD-BIOS-UMR AGAP (FRA)
  • Letourmy Philippe, CIRAD-PERSYST-UPR AIDA (FRA) ORCID: 0000-0003-1040-0860
  • Cao Tuong-Vi, CIRAD-BIOS-UMR AGAP (FRA)
  • Lawac Floriane
  • Chaïr Hâna, CIRAD-BIOS-UMR AGAP (FRA)
  • Lebot Vincent, CIRAD-BIOS-UMR AGAP (VUT)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/579945/)

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