Variation in virus populations and growth characteristics of two sugarcane cultivars naturally infected by Sugarcane yellow leaf virus in different geographical locations

Abu Ahmad Youssef, Girard Jean-Claude, Fernandez Emmanuel, Pauquet Jérôme, Lockhart Benham E.L., Letourmy Philippe, Rott Philippe. 2007. Variation in virus populations and growth characteristics of two sugarcane cultivars naturally infected by Sugarcane yellow leaf virus in different geographical locations. Plant Pathology, 56 (5) : 743-754.

Résumé : Two sugarcane cultivars (R570 and SP71-6163) naturally infected by Sugarcane yellow leaf virus (SCYLV) were each imported from several geographical locations into a sugarcane yellow leaf-free environment (Montpellier, France). Plants were grown as plant cane for 5-6 months and the experiment was repeated for three consecutive years (2003-2005) in a greenhouse. Several sugarcane-growth and disease characteristics were monitored to identify variation in pathogenicity of SCYLV. Depending on their geographical origin, sugarcane cvs R570 and SP71-6163 were infected by SCYLV genotypes BRA-PER or REU, or a mixture of the two. Severity of symptoms did not vary between plants of cv. R570, but variation in disease severity between plants of cv. SP71-6163 from different geographical locations suggested the occurrence of pathogenic variants of SCYLV. For each sugarcane cultivar, differences in stalk length, number of stalk internodes, virus titre in the top visible dewlap leaf, and percentage of infection of leaf and stalk phloem vessels were also found between plants from different geographical origins. However, these differences were not always reproducible from one year to another, suggesting occurrence of different plant responses to SCYLV isolates under varying environmental conditions.

Mots-clés Agrovoc : Saccharum officinarum, variété, génotype, virus des végétaux, identification, épidémiologie, infection, phloème, croissance, PCR, Test ELISA, pouvoir pathogène, provenance

Mots-clés complémentaires : Sugarcane yellow leaf virus

Classification Agris : H20 - Maladies des plantes

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

• Abu Ahmad Youssef
• Girard Jean-Claude, CIRAD-BIOS-UMR BGPI (FRA)
• Fernandez Emmanuel, CIRAD-BIOS-UMR BGPI (FRA)
• Pauquet Jérôme, CIRAD-AMIS-UMR PIA (FRA)
• Lockhart Benham E.L., University of Minnesota (USA)
• Letourmy Philippe, CIRAD-PERSYST-UPR Biostatistique (FRA) ORCID: 0000-0003-1040-0860
• Rott Philippe, CIRAD-BIOS-UMR BGPI (FRA) ORCID: 0000-0001-6085-6159

Source : Cirad - Agritrop (https://agritrop.cirad.fr/540791/)

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