Cuscuta Species in the Lowlands of Sri Lanka, their Host Range and Host-Parasite Association

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2016 C. JAYASINGHE, D.S.A. WIJESUNDARA, K.U. TENNEKOON, B. MARAMBE Vol. 16

Résumé

ABSTRACT. The study included current distribution, host range, taxonomy and anatomy of the host-parasite association. The lowland Cuscuta spp. identified in the present study was different to Cuscuta chinensis as previously reported but similar to Cuscuta campestris. It was observed that Cuscuta is widely distributed in the dry areas such as Anuradhapura, Polonnaruwa and Hambantota in Sri Lanka. However, it was also found in scattered patches in the low country wet zone. In the dry zone, it was found frequently along the banks of irrigation channels, agricultural land and roadside vegetation. In the coastal areas Cuscuta was distributed mostly along the railway tracks, roadsides and wastelands. About 161 host plant spp., including rice, belonging to 59 families and 139 genera were observed as the host plants of this holo-parasite. Mikania cordata and Wedelia trilobata appear to be the primary hosts to the lowland Cuscuta. Haustorial penetration was observed in the different host plants, including rice. However, in the rice plant, haustorial penetration was observed only on the midrib of the leaves. Haustoria of lowland Cuscuta did not show complex anatomical differentiations, but penetration distance depends on location of the host vascular system. However, some host plants showed resistance against the penetration of haustoria.

Une contribution de Jean-François Olivier

Anglais

Sri Lanka

Plantes supérieures (Tracheophyta)

Plantes parasites

article scientifique, PDF gratuit sur internet

Informations contenu

19 pages

Description des espèces, photos en couleur, dessins en noir et blanc, cartes géographiques, clés de détermination, couverture plastifiée

Référence Nadaba : 28451

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