Distribution of Acremonium coenophialum in developing seedlings and inflorescences of Festuca arundinacea Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/pg15bh39g

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  • Acremonium coenophialum is an endophytic fungus which infects the reproductive and vegetative tissue of tall fescue. Interest in this fungus was sparked by research which linked its presence in tall fescue with reduced weight gains and alkaloid-like poisoning in cattle. Incomplete information was available on the endophyte's life or disease cycle within the host grass. This current investigation traces the progression of A. coenophialum during plant development. Inflorescences of mature plants, in addition to seedlings, were histologically examined for the presence of the endophyte. The fungus grows from shoot apices into immature inflorescences and, eventually, into mature seed. From infected seeds, A. coenophialum grows into seedlings and occupies the shoot meristems of the plant. In contrast to previous information, the fungus invades the shoot primordia before seed germination, is capable of growing in roots, and is found inter/intracellularly.
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