Silicon and water stress synergy in resistance of sugarcane cultivars to the stalk borer, Eldana saccharina (Lepidoptera : Pyralidae)

Kvedaras Olivia L., Keeping Malcom G., Goebel François-Régis, Byrne M.J.. 2006. Silicon and water stress synergy in resistance of sugarcane cultivars to the stalk borer, Eldana saccharina (Lepidoptera : Pyralidae). Proceedings of the Annual Congress of the South African Sugar Technologists' Association, 80 : 291-296. Annual Congress of the South African Sugar Technologists' Association (SASTA). 80, Durban, Afrique du Sud, 18 Juillet 2006/20 Juillet 2006.

Résumé : Silicon (Si) improves plant resistance to insect attack and may also enhance tolerance of water stress. The objective of this study was to evaluate whether Si-mediated resistance of sugarcane to the borer Eldana saccharina Walker (Lepidoptera: Pyralidae) is enhanced by water stress. Sugarcane cultivars, two resistant to E. saccharina (N21, N33) and two susceptible (N26, N11) were grown in a pot trial, in Si deficient river sand with (Si+) and without (Si-) calcium silicate. To induce water stress, irrigation to half of the trial was reduced prior to inoculation with E. saccharina eggs, and harvested 66 days later. Stressed and non-stressed plants of the same cultivar did not differ significantly in Si content. However, Si+ plants exhibited increased resistance to E. saccharina attack. In Si+ cane, E. saccharina larval survival and biomass was lower than in Si- cane, significantly so for stressed, susceptible cultivars N26 and N11, and for larval mass in non-stressed N26. Stalk damage was reduced in Si+ cane, significantly so for the stressed, susceptible cultivars N26 and N11, and non-stressed N26. This study showed that Si provides greater protection against E. saccharina attack in susceptible, water-stressed sugarcane than in non-stressed cane and/or resistant cultivars.

Mots-clés Agrovoc : Saccharum officinarum, Eldana saccharina, silicium, stress dû à la sécheresse

Mots-clés géographiques Agrovoc : Afrique du Sud

Classification Agris : H10 - Ravageurs des plantes

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

Auteurs et affiliations

• Kvedaras Olivia L., SASRI (ZAF)
• Keeping Malcom G., SASRI (ZAF)
• Goebel François-Régis, CIRAD-CA-UPR Systèmes canniers (FRA) ORCID: 0000-0002-5438-1078
• Byrne M.J., University of the Witwatersrand (ZAF)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/533745/)

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