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Endophytic fungal diversity of 2 sand dune wild legumes from the southwest coast of India

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Endophytic fungi of 3 age classes (seeds, seedlings, and mature plants) and 5 tissue classes (cotyledons, seed coats, roots, stems, and leaves) of coastal sand dune legumes Canavalia cathartica and Canavalia maritima were assessed by plating surface-sterilized segments on malt extract agar. Forty-six fungal taxa comprising 6 ascomycetes, 33 mitosporic fungi, 2 zygomycetes, and 5 sterile morphospecies were recovered. There was no significant difference in the colonization frequency of endophytes between plant species (p = 0.4098, Student's t test). Among the age classes, endophytic fungi colonized over 90% of seedlings and mature plants. Similarly, among tissue classes, endophytic fungi colonized over 90% of root, stem, and leaf segments. Diversity and richness of endophytic fungi were higher in C. cathartica than in C. maritima. Rarefaction curves revealed a "higher expected number of species" in mature plants of C. cathartica and seedlings of C. maritima, whereas it was highest in leaves of both plant species. The most dominant endophyte, Chaetomium globosum, colonized over 50% of the root, stem, and leaf segments of C. maritima and over 50% of the root segments of C. cathartica. The colonization frequency of C. globosum was found to be 5%–12.5% in seeds and increased up to 40%–64.4% in seedlings or mature plants. Halosarpheia sp. was the only marine fungus recovered among the endophytes.Key words: sand dunes, coast, legumes, Canavalia, diversity, endophytes, fungi, Chaetomium globosum.

Des champignons endophytes de 3 classes d'âge (semences, semis et plantes matures) et 4 classes de tissus (cotylédons, enveloppes de graines, racines, tiges et feuilles) des légumineuses de dunes sablonneuses côtières, Canavalia cathartica et Canavalia maritima, ont été évalués en ensemençant des segments d'agar d'extrait de malt stérilisés en surface. Quarante-six taxons de champignons comprenant 6 ascomycètes, 33 champignons mitosporiques, 2 zygomycètes et 5 morpho-espèces stériles ont été recueillis. Aucune différence significative n'a été notée dans la fréquence de colonisation des endophytes entre les espèces de plantes (p = 0,4098, test t). Parmi les classes d'âge, les champignons endophytes ont colonisé plus de 90 % des segments de semis et de plantes matures, donc les segments des racines, de la tige et des feuilles au niveau des classes de tissus. La diversité et la richesse des champignons endophytes étaient supérieures chez C. cathartica par rapport à C. maritima. Des courbes de raréfaction ont révélé un nombre attendu d'espèces supérieur chez les plantes matures de C. cathartica et les semis de C. maritima, alors qu'il était à son maximum dans les feuilles des 2 espèces de plantes. L'endophyte dominant, Chaetomium globosum, a colonisé plus de 50 % des segments de racines, de tiges et de feuilles de C. maritima et les segments de racines de C. cathartica. Le pourcentage de fréquence de la colonisation de C. globosum a augmenté de 5–12,5 % dans les semences jusqu'à 40–64,4 % dans les semis ou les plantes matures. Halosarpheia sp. était le seul champignon marin parmi les endophytes recueillis.Mots clés : dunes sablonneuses, côtes, légumineuse, Canavalia, diversité, endophytes, champignons, Chaetomium globosum.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: 2004-12-01

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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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