Inert matter with rice and wheat seeds is source of inoculum of plant pathogens
Presence of fungi in inert matter of rice and wheat seed samples were investigated. Sixty seven seed samples representing three rice and one wheat cultivars collected from nine seed processing centers and four contact grower zones in 13 locations of Bangladesh were analyzed for the presence of inert matter and infestation of seeds by fungi. The inert matter separated from seeds was grouped into three categories: I, broken seeds, husk and awn; II, sand and soil and III, pieces of brick, stone, fiber, hair and insects. Fungi associated with inert matter was detected following centrifugation of inert matter and subsequently plating on Agar plates both the supernatant and the sediment. Inert matter accounted for 0.28% of total weight of rice seed samples with 60% in Group I category and fungi detected were Bipolaris oryzae, Fusarium spp., Aspergillus flavus, A. niger, A. ochraceus and Penicillium sp. Upon analyses by standard Blotter Method, samples of rice seed yielded B. oryzae, Pyricularia oryzae, Alternaria padwickii and Fusarium spp. with variable frequencies. Inert matter in wheat seeds accounted for 0.294% of total weight of seed samples analyzed. Fungi detected in inert matter of wheat seeds included Fusarium moniliforme, B. sorokiniana, A. flavus, A. niger, A. candidus, A. ochraceaus and Panicillium sp Similarly, samples of wheat seeds analyzed by the Blotter Method yielded the same fungi but in different frequencies. Also like rice, Group I category of inert matter dominated the wheat seeds samples and this component of the inert matter carried the important pathogenic fungi B. oryzae and B. sorokiniana respectively. The number of fungal colonies distinctly varied among the three categories of inert matter and was positively correlated with the total weight of inert matter. Germination of seeds was negatively correlated to seed infection and significantly affected by seed infection by Bipolaris sp.
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Document Type: Research Article
Publication date: April 1, 2005
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