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標題: A new 'forma specialis' of Fusarium solani causing leaf yellowing of Phalaenopsis
作者: W.C.Chung
關鍵字: Fusarium solani;IGS;ITS;orchids;pathogenicity;beta-tubulin;fujikuroi species complex;f-sp cucurbitae;root-rot;passionfruit;disease;soils;wilt
Project: Plant Pathology, Volume 60, Issue 2, Page(s) 244-252.
The pathogenicity of 35 Fusarium solani isolates obtained from diseased leaves of greenhouse-grown Phalaenopsis plants in Taiwan was tested on different orchids, including Phalaenopsis sp., Cymbidium spp., Oncidium sp., Dendrobium sp. and Cattleya sp., plus pea (Pisum sativum), chrysanthemum (Chrysanthemum indicum) and cucurbit [melon (Cucumis melo) and cucmber (C. sativus)] plants. Isolates of F. solani from Phalaenopsis spp. caused severe leaf yellowing on Phalaenopsis and mild symptoms on Cymbidium spp., but no visual symptoms on Oncidium sp., Dendrobium sp., Cattleya sp., pea, chrysanthemum or melon. Fusarium solani isolates collected from Phalaenopsis, pea and cucurbits were molecularly characterized by internal transcribed spacer (ITS), intergenic spacer (IGS) and beta-tubulin gene analyses. Phylogenetic trees constructed by distance and parsimony methods indicated that isolates from Phalaenopsis were grouped into one type based on ITS, IGS and beta-tubulin sequences with high bootstrap value (> 84%) support, compared to 'formae speciales' of F. solani from the other hosts. These analyses show that isolates of F. solani from Phalaenopsis are distinct from F. solani isolates from other hosts in Taiwan. Therefore, it is proposed that F. solani isolates that incite Phalaenopsis leaf yellowing be designated F. solani f. sp. phalaenopsis.
ISSN: 0032-0862
DOI: 10.1111/j.1365-3059.2010.02376.x
Appears in Collections:植物病理學系

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