PJB-2022-233
POLLEN ULTRA-SCULPTURAL ANALYSIS OF SOME CAESALPINIOIDEAE TAXA OF HAINAN ISLAND SOUTH CHINA AND ITS TAXONOMIC RELEVANCE
SARAJ BAHADUR
Abstract
The present study presented the pollen morphology of some Caesalpinioideae taxa collected from different geographical regions of Hainan Island. Such palynological study on this specific group was not previously documented. Hence, to fill this gap, this study was designed and conducted to expand the palyno-morphological knowledge of the Caesalpinioideae taxa, contributing to the taxonomic study, correctly identify and define species boundaries at the various taxonomic level by using scanning electron microscopic techniques (SEM). Species were first collected and identified and then confirmed with the available flora of China. The SEM techniques were used to observe the ultra-sculpture of the pollen. The SEM was found a useful tool to help in the determination of various Caesalpinioideae taxa. The pollen was measured, described qualitatively and illustrated. Variation in pollen traits i.e. size (small, large), amb (circular, triangular, elliptical), shape (spheroidal, sub-spheroidal, oblate, prolate), detail of the apocolpium region (small, large), type of endoapertures (lolongate, circular) and exine sculpturing (reticulate, finely reticulate, mega-reticulate, perforate, psilate) can aid significantly in the differentiation of pollen grains of the Caesalpinioideae taxa. The quantitative data together with the qualitative features assist in the delimitation of species. Hence, our study contributes to confirming the eurypalynous feature of the Caesalpinioideae.
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