Meta-analysis of a large industrial latex diagnosis database provides insight on Hevea brasiliensis clonal adaptation and site-specific yield potential in Western Africa

Gohet Eric, Cauchy Thierry, Soumahoro Mouman, Kotochi Clement, Chegbene P., Njoku Apollonia, Lesturgez Gregory. 2019. Meta-analysis of a large industrial latex diagnosis database provides insight on Hevea brasiliensis clonal adaptation and site-specific yield potential in Western Africa. . IRRDB. Nay Pyi Taw : IRRDB, 19 p. International Rubber Conference 2019, IRRDB, Nay Pyi Taw, Myanmar, 30 Septembre 2019/1 Octobre 2019.

Résumé : A meta-analysis of the Latex Diagnosis (LD) database gathering all LD data stored from 2006 to 2018 in SIFCA/SIPH plantations of Côte d'Ivoire (SAPH), Ghana (GREL) and Nigeria (RENL) has been performed. Average clonal LD data comprising Sucrose (Suc), Inorganic Phosphorus (Pi), Reduced Thiols (RSH) and latex Total Solid Content (TSC) were analyzed and compared for different plantation sites of SAPH (Toupah, Ousrou, Bongo, Rapides Grah, Digahio, Divo and Bettie), GREL (Abura) and RENL (Osse River, New Land, Utagba Uno, Araromi, Waterside and Iguobazuwa). The database was filtered in order to keep only the LD data obtained either from conventional and standard tapping systems (S/2 downward and S/4 upward), excluding the intensified period before slaughtering. Data were processed and analyzed on clones GT1, RRIM600, PR107, AV2037, RRIC100, AF261, PB5/51, PB217, PB235, PB260, PB312, PB314, IRCA18, IRCA41, IRCA109, IRCA111, IRCA130, IRCA209 and IRCA230. All clones were tapped either in d4 or d5 6d/7 tapping frequencies. Stimulation was applied on panel (Pa), under industrial stimulation rates adapted to each clone metabolism and clonal sugar loading characteristics. Based on the relation between Suc and Pi, the analysis of these LD data confirms the latex physiological positioning in clonal typology of all clones. It confirms in particular the high latex sugar loading capacity of clones PB217 (as this clone obtains the highest latex Suc level whatever the plantation site), IRCA109, IRCA41 and IRCA230. It also reveals a systematic positive correlation for all sites between RSH and Suc latex contents: Clones with high latex Suc maintain higher RSH latex concentrations than clones with lower Suc, confirming at industrial scale earlier research results. The physiological hypothesis is that a high clonal latex sugar loading, allowing higher stimulation rates and improved stimulation response, would as well maintain higher latex RSH levels resulting in an improved resistance to oxidative stress resulting from latex metabolic activation. This improved scavenging protection would therefore have positive effects on membranes integrity, on latex stability, on latex flow and on tapping panel dryness (TPD) onset. Moreover, as tapping intensity (tapping frequency and stimulation) was almost similar in all sites, we also make the hypothesis that the latex RSH level and the Pi x RSH value might be accurate indicators to describe, at plantation site level, the local clonal suitability as well as the global stress conditions of trees on each plantation site. This study will be completed later on in order to set up a standard interpretation method of such LD databases.

Auteurs et affiliations

• Gohet Eric, CIRAD-PERSYST-UPR Systèmes de pérennes (FRA) ORCID: 0000-0002-0379-0592
• Cauchy Thierry, Michelin (CIV)
• Soumahoro Mouman, SAPH (CIV)
• Kotochi Clement, GREL (GHA)
• Chegbene P., RRIN (NGA)
• Njoku Apollonia
• Lesturgez Gregory, Michelin (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/593887/)

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