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Foliar micromorphology as a tool for identification of Indian taxa of Polygonaceae
Payel Paul,Monoranjan Chowdhury 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.4
Polygonaceae, a morphologically diverse family, cosmopolite to temperate region. In India, the familyhas extensive array of distribution from the coastal plains to the subtropical temperate region andalmost to the subalpine regions. Polygonaceae has a very restricted flowering and fruiting period,limiting over proper identification using floral characters. This study attempts to identify the membersof Indian Polygonaceae based on permanent and stable foliar morphological characters. Most of thetaxa displayed microphyllous, unlobed lamina with erose margin, except Rheum nobile (macrophyllous),Polygonum runcinatum (lobed lamina). Parameters like lamina shape, shape and angle of apexand base showed significant macromorphological variations. Three different types of indumentum viz. peltate, capitate spheroidal and stellate glandular and minor venation pattern pulls significant differences. Four major stomatal types were detected viz. anisocytic, anomocytic, paracytic and pericytic,with more than one type in a single taxon. Statistical based infra generic observation identified fourdistinct principal component analysis (PCA) clusters separating the members of Persicaria, Polygonum,Rumex and Fagopyrum, whereas Fallopia, Rheum, Antigonon, Homalocladium were scatteredly distributedin the matrix scoring plot of PCA. Species distributional matrix of PCA was fully supported byagglomerative hierarchical clustering. The analyzed significant systematic values are quite constant atspecific and/or below rank.
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Photosynthesis and Water-Use Efficiency of Some Mangroves from Sundarbans, India
Nandy, Paramita,Ghose, Monoranjan 한국식물학회 2001 Journal of Plant Biology Vol.44 No.4
We studied seasonal fluctuations in the rates of photosynthesis, transpiration, PAR, and stomatal conductance for 16 species of true mangroves from the Sundarbans region of West Bengal. Soil salinity and pH were also measured. Leaf temperatures were almost always higher than the ambient temperature. We observed considerable seasonal (summer vs winter) as well as interspecific variations in photosynthesis, with the highest rates occurring in Heritiera fomes (13.21μ㏖ m^-2 s^-1) and Avicennia marina (11.8μ㏖ m^-2 s^-1), and the lowest in Nypa fruticans (1.56μ㏖ m^-2 s^-1) and Ceriops decandra (2.32μ㏖ m^-2 s^-1). In many species, an abrupt rise in leaf temperature retarded the photosynthetic process. In winter, the rate of transpiration and stomatal conductance reached their maxima in A. marina (4.83m㏖ m^-2 s^-1 and 124.23 m㏖ m^-2 s^-1, respectively) and their mimima in Excoecaria agallocha (1.85m㏖ m^-2 s^-1 and 49.19m㏖ m^-2 s^-1, respectively). In contrast, the maximum summer readings were recorded in E. agallocha (6.07m㏖ m^-2 s^-1 and 192.74m㏖ m^-2 s^-1 respectively).
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