Rishi Kumar Sharma1, Shatrughna Singh2
1.
2. Department
of Botany, Udai Pratap Autonomous College, Varanasi – 221002
.
Abstract
In the tropical paddy fields, numerous
prevailing conditions and factors i.e., either natural or man-made, apparently
influence the cyanobacterial diversity. On the basis of study on different rice
cultivation sites around the Varanasi district of Uttar Pradesh (India), it had
been observed that the gradually increasing dense canopy of rice plants
resulted in the death of already flourishing filamentous green algal mat and
favored the growth of various cyanobacterial forms. In most of the rice
fields, the maximum diversity of cyanobacteria was during the vegetative growth
phase and grain filling phase of rice cultivation, when maximum shade had been
provided by the rice plant. In most of the rice fields around the last
phase of rice cultivation, when the soil became fully exposed to solar light,
the brownish coloured papery layer of Aulosira sp. had been
observed on the soil as well as attached to the remaining stumps of the rice
plants but the cyanobacteria was in the sporulation phase. However, an
appreciable number of Nostoc, Cylindrospermum, Microcoleus and Chroococcus
sp. had been observed from the fully exposed and illuminated portion of
rice fields and its cultivation cycle. Most of the cyanobacterial forms
collected from the fully exposed portions of rice fields to sunlight, developed
larger amounts of bright/ dark coloured mucilage or exopolysaccharide compared
to most of the other forms that grew in the shelter of paddy. The present communication is related to the study
of local cyanobacterial diversity along with its interaction with the light
regime that can be useful for the efficient algalization.
Keywords: Cyanobacteria, Rice
fields, Sunlight
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Publication
Article ID: P0301013 RA
Received: 19/07/2020
Accepted: 16/10/2020
Published: 16/06/2021
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