Mycoparasitism among some seed-borne fungi
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Authors
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R.C. DUBEY, JYOTI SAXENA and NEETA PANDE
Department of Botany and Microbiology, Gurukul Kangri University, Haridwar 249 404
Keywords:
Seed-borne fungi, mycoparasitism, necrotrophicAbstract
Wheat grains were collected from different localities of the Kumaon region of Uttar Pradesh, India, and screened for seed mycoflora in different seasons. The dominant fungi, Aspergillus flavus, Drechslera spicifer [Cochliobolus spicifer] and Rhizopus stolonifer, were stored on PDA. Hyphal interaction studies among them were made by the dual inoculation culture method. The results showed that hypha of A. flavus (antagonist) penetrated the hyphae of R. stolonifer, forming branches inside the cell andexploiting the cytoplasm. C. spicifer (antagonist) penetrated the hyphae of A. flavus (host) and exhibited profuse branching inside the host hypha. C. spicifer was able to produce the survival structure i.e. chlamydospores inside/outside the host hyphae(A. flavus). A. flavus acting as a host for C. spicifer, in turn behaved as a destructive mycoparasite for R. stolonifer. A. flavus coiled around the sporangiophore of R. stolonifer, penetrated the hypha and proliferated its branches inside the lumen; finally the host hypha was lysed. The hypha of C. spicifer penetrated the hypha of R. stolonifer, accumulating in the vesicles and later lysing the vesicles. C. spicifer formed profuse branches inside the lumen of host hypha. In response to penetration bythe parasite, the host hypha developed a dense area of cytoplasm appearing as septa to arrest the further growth and destruction by the parasite. C. spicifer penetrated the barrier formed by R. stolonifer and grew inside the lumen.
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