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Endophytic fungi from Amomum siamense

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Endophytic fungi were isolated from apparently healthy organs of the wild ginger Amomum siamense Criab., including leaves, pseudostems, and rhizomes, collected from two sites in Doi Suthep-Pui National Park, Thailand. Endophytes were relatively common with an isolate prevalence of 70%–83% at the two sites sampled in the wet and dry seasons. The endophyte assemblages from the two sites were diverse and comprised 7 Ascomycetes and 26 mitosporic fungi. Colletotrichum "gloeosporioides" (Penz.) Penz. & Sacc. in Penz., Glomerella spp., xylariaceous fungi, and Phomopsis spp. were consistently dominant as endophytes on Amomum siamense, but many rare species and mycelia sterilia were also recorded. There was no significant difference between the number of isolates recovered from leaves containing vein tissues and those containing intervein tissues, independent of leaf age. Most taxa showed a preference for either leaf tissue or pseudostems. Two new Ascomycetes species, Gaeumannomyces amomi and Leiosphaerella amomi, were discovered from leaves and rhizomes, respectively, and four species of Pyricularia, including three new species, were isolated from leaves.Key words: Zingiberaceae endophytes, isolate prevalence, tissue specificity, seasonal effects.

Des champignons endophytes ont été isolés d'organes apparemment sains du gingembre sauvage Amomum siamense Criab., soit à partir des feuilles, des pseudotiges et des rhizomes récoltés dans deux sites du Parc National Doi Suthep-Pui en Thaïlande. Ces endophytes étaient relativement communs, car leur prévalence d'isolement était de 70 % - 83 % aux deux endroits échantillonnés et ce en saisons sèches ou humides. Les populations d'endophytes de chacun des sites étaient diversifiées et comprenaient 7 Ascomycètes et 26 champignons à reproduction asexuée. Chez l'Amomum siamense, les endophytes régulièrement dominants étaient Colletotrichum "gloeosporioides" (Penz.) Penz. & Sacc. in Penz., Glomerella spp., des champignons du groupe des Xylariaceae et Phomopsis spp. mais plusieurs espèces rares ainsi que des mycéliums stériles ont aussi été observés. Il n'y avait pas de différence significative dans le nombre d'isolats provenant de feuilles contenant du tissu veineux ou intraveineux, indépendemment de l'âge de la feuille. La majorité des taxa ont montré une préférence pour le feuillage ou les pseudotiges. Deux nouvelles espèces d'Ascomycètes, Gaeumannomyces amomi et Leiosphaerella amomi, ont été découvertes respectivement dans les feuilles et les rhizomes et quatre espèces de Pyricularia, incluant trois nouvelles espèces, ont été isolées à partir des feuilles.Mots clés : Zingiberaceae endophytes, prévalence des isolats, spécificité tissulaire, effets saisonniers.[Traduit par la Rédaction]

Keywords: Zingiberaceae endophytes; effets saisonniers; isolate prevalence; prévalence des isolats; seasonal effects; spécificité; tissue specificity; tissulaire

Document Type: Research Article

Publication date: October 1, 2001

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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