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Taxonomic placement of Epichloëpoae *** horizontal dissemination to seedlings via conidia

Fungal Diversity 2012年第3期54卷 117-131页

作者： Mariusz Tadych Karen V.Ambrose Marshall S.Bergen Faith C.Belanger James F.White Jr Department of Plant Biology and Pathology Rutgers University59 Dudley RoadNew BrunswickNJ 08901USA

A new Epichloëspecies distributed in Africa,Europe,North America and South America on host genera Bromus,Festuca,Lolium and Poa is ***,characteristic of the genus,frequently occurred on the reproductive tillers of Poa secunda ***,but neither perithecia nor mature asci were *** cells and conidial characteristics were in the range of Epichloë*** of the genes encodingβ-tubulin(tub2)and translation elongation factor 1-α(tef1)were amplified and *** analyses of these sequences grouped the Poa secunda *** endophyte into one group within a non-hybrid Epichloëspecies *** the basis of morphology,host range and evolutionary history we propose that this endophyte represents a new species of Epichloë.The name Epichloëpoae is proposed for this *** infectivity of the conidia produced on plants was *** the first experiment,using conidia of Epichloëpoae from leaves and endophytefree seeds of Poa secunda *** we show that when germinating seeds and developing seedlings of the plant were exposed to conidia,28–57%of seedlings became infected by the *** non-inoculated control plants showed no colonization by the *** the following spring after vernalization,colonized plants on flowering culms produced stromata with *** the second experiment,using stromal conidia and the same procedure,19–42%of seedlings of Poa secunda *** became colonized by the *** results demonstrate that Epichloëpoae may spread to uninfected grass hosts by conidia frequently formed on the surfaces of plant leaves as well as by conidia formed on stromata.

关键词： Endophyte epiphyllous Evolution Neotyphodium Poa secunda subsp juncifolia Seed

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