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Master Thesis

Émergence de la rouille orangée de la canne à sucre (Puccinia kuehnii) à La Réunion : caractérisation de son impact sur le programme local de création et de sélection variétales

Abstract : Sugarcane orange rust, caused by the pathogen Puccinia kuehnii, is an emerging disease in several sugarcane producing countries and, in Reunion Island, it was first reported between July and August 2018. The local sugarcane research center, eRcane, had never assessed the impact of this disease on its germplasm. The present study represents the very first evaluation of this impact and it provided useful information to design strategies of adaptation for the breeding program in order to develop the genetic resistance. A total of 28 repeated trials, distributed in all the experimentation stations of eRcane, and from various selection stages, were assessed under natural inoculation and during a favorable period (March-July 2020). The severity of the infection was assessed on the varietal plot individually by using a quantitative scale. The data were analyzed through different linear mixed models. The results we obtained show : (i) a relative homogeneity of the infection, in most of the stations, allowing strong varietal assessments ; (ii) higher incidence and mean severity in the stations located in more humid environments ; (iii) a relative consistency of the severity levels between trials within the most favorable station (Saint-Benoît) ; (iv) significant interactions between varieties and experimentation stations ; (v) the susceptibility of several commercial cultivars that are important for the industry and whose evolution should be monitored ; (vi) a relatively high narrow sense heritability of the resistance to the disease which indicates a character that could give rise to genetic improvement.
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https://dumas.ccsd.cnrs.fr/dumas-03032921
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Submitted on : Tuesday, December 1, 2020 - 10:19:29 AM
Last modification on : Sunday, December 6, 2020 - 3:21:31 AM
Long-term archiving on: : Tuesday, March 2, 2021 - 6:35:40 PM

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  • HAL Id : dumas-03032921, version 1

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Jordan Dijoux. Émergence de la rouille orangée de la canne à sucre (Puccinia kuehnii) à La Réunion : caractérisation de son impact sur le programme local de création et de sélection variétales. Agronomie. 2020. ⟨dumas-03032921⟩

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