Genetic analysis of agronomic and physiological traits associated with latex yield revealed complex genetic bases in Hevea brasiliensis

Ismawanto Sigit, Aji Martini, Lopez David, Mournet Pierre, Gohet Eric, Syafaah Afdholiatus, Bonal Florelle, Oktavia Fetrina, Taryono, Subandiyah Siti, Montoro Pascal. 2024. Genetic analysis of agronomic and physiological traits associated with latex yield revealed complex genetic bases in Hevea brasiliensis. Heliyon, 10 (13):e33421, 14 p.

https://doi.org/10.1016/j.heliyon.2024.e33421

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Résumé : Hevea brasiliensis, a natural rubber producing species, is widely cultivated due to its high rubber yield potential. Natural rubber is synthesised in the rubber particles of laticifers. Latex diagnosis (LD) was established to characterise the physiological state of the laticiferous system by measuring its physiological parameters, i.e., sucrose, inorganic phosphorous (Pi), thiols and total solid content (TSC). Rubber clones are often classified in three groups i.e., quick starters, medium starters and slow starters. To better understand the genetic bases of latex yield, a biparental population was generated from a cross between the quick-starter clone PB 260 and the medium-starter clone SP 217. LD was performed during the peak latex production season and used to calculate sucrose loading. The agronomic and physiological parameters associated with latex yield led to the classification of genotypes according to the rubber clonal typology and to the identification of quantitative trait loci (QTL) using a high-density map. Inorganic phosphorous content was positively associated with yield during the first year of production thus enabling identification of quick-starter clones. In addition, the LD-based clonal typology led to determine the long-term yield potential and the use of appropriate ethephon stimulation. QTL analysis successfully identified several QTLs related to yield, sucrose, Pi and TSC. One QTL related to sucrose loading was identified in the same position as the QTL for sucrose on linkage group 1. To our knowledge, this is the first study to report QTL analysis for this trait. The use of a high-density map enables the identification of genes underlying QTLs. Several putative genes underlying QTLs related to yield, sucrose and TSC were identified.

Mots-clés Agrovoc : Hevea brasiliensis, latex, locus des caractères quantitatifs, marqueur génétique, génotype, caoutchouc, métabolisme, caractère agronomique, carte génétique, rendement

Mots-clés géographiques Agrovoc : Indonésie

Mots-clés libres : Clonal typology, Inorganic phosphorus, Latex diagnosis, Latex yield, QTL, Rubber, Sucrose

Classification Agris : F30 - Génétique et amélioration des plantes
F01 - Culture des plantes

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement hors UE : Agropolis Fondation, Indonesian Rubber Research Institute

Projets sur financement : (FRA) Labex AGRO 2011-LBX-002, (FRA) RUbber agroforestry Breeding Initiative for Smallholders

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