Volume 2 Issue 2

Distribution pattern and mycorrhizal status of weed flora grown
in fly ash pond

Author(s): A. GOSWAMI, B. N. PANJA, J. SAHA AND S. CHAUDHURI

Abstract: Sixty weed species grew naturally on fly ash pond of Bandel Thermal Power Station at Triveni, about 50 km North- East from Kolkata. Poaceae and Cyperaceae under monocotyledon and Compositae, Euphorbiaceae and Amaranthaceae under the dicotyledon were the predominant weed families based on the number of species recorded. The diversity of weed species was found higher in Poaceae followed by Cyperaceae and others. Out of sixty weed species recorded only seventeen belong to nine weed families- two under monocotyledon and seven under dicotyledon, were found to be inherently mycorrhizal. The frequencies of mycorrhizal and non-mycorrhizal weed species grown in ash pond zones nearer to the fly ash soil border were characteristically higher and gradually declined at the zones away from border i.e towards the centre of the pond. Mycorrhizal colonization in weed roots and mycorrhizal infectivity potential in terms of the most probable number (MPN) of rhizosphere fly ash were also exhibited the same trend. The predominant arbuscular mycorrhizal fungus amongst the species (AMF) isolated from plant rhizospheres of ash sample under study was Glomus mosseae followed by G. fasciculatum, Gigaspora sp and Acaulospora sp.

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