Potential role of winter rape weeds in the extension of broomrape in Poitou-Charentes |
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Authors: | Gibot-Leclerc Stéphanie Brault Marianne Pinochet Xavier Sallé Georges |
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Institution: | Laboratoire de parasitologie végétale, université Pierre-et-Marie-Curie, tour 53, case courrier 155, 4, place Jussieu, 75252 Paris, France. gibotl@moka.ccr.jussieu.fr |
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Abstract: | In the Poitou-Charentes district, among the 82 species of winter rape weeds identified, 22 displayed a strong affinity for this crop (Brassica napus L.). In fields, 50% of these weeds were parasitized by Orobanche ramosa, playing the role of host plants. Greenhouse co-cultures (weed/Orobanche ramosa) showed that weeds non-parasitized in fields could be attacked by broomrape, developing a more or less complete cycle. In vitro co-cultures (weed/Orobanche ramosa) revealed that root exudates of non-parasitized weeds, in fields or in greenhouse co-cultures, could induce Orobanche ramosa seed germination, but not attachment. These weeds could play the role of false hosts. |
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Keywords: | adventices colza d'hiver Poitou-Charentes parasitisme holoparasite weeds winter rape Poitou-Charentes parasitism holoparasite |
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