SEED MORPHOMETRY IN COELOGYN LINDL., CYMBIDIUM SW. AND PHOLIDOTA LINDL. (ORCHIDACEAE) WITH SPECIAL REFERENCE TO THEIR INTERRELATIONSHIPS AND ECOLOGICAL SIGNIFICANCE
SEM (Scanning Electron Microscope) studies on seed morphometry of 9 epiphytic orchids, including Coelogyne breviscapa Lindl., C. nervosa A. Arch., C. nitida Lindl., C. ovalis Lindl., Cymbidium aloifolium Sw., C. bicolor Lindl., C. eburneum Lindl., C. zyganteum Wall. Ex Lindl. and Pholidota pallida Lindl. have been carried out. The quantitative data related to the length and width of the seed and embryo, seed and embryo volume, percentage of air space, and number of testa cells were presented here. This study showed that the seeds of Coelogyne species are more truncated than the Cymbidium and Pholidota. The maximum number of testa cells was observed in those seeds having lower seed volume, i.e. C. breviscapa. In Cymbidium testa cells showed ornamentation whereas in Coelogyne and Pholidota these were without any ornamentation. From the present investigation a direct correlation has been drawn among the seed/embryo volume ratio, the percentage of air space and the buoyancy of the seeds. The buoyancy of seeds could be attributed to the dispersal of seeds to vast areas as well as wide distribution of the species.
Khasim, S.M., Ramudu, J. and Sakunthala, S. (2015). SEED MORPHOMETRY IN COELOGYN LINDL., CYMBIDIUM SW. AND PHOLIDOTA LINDL. (ORCHIDACEAE) WITH SPECIAL REFERENCE TO THEIR INTERRELATIONSHIPS AND ECOLOGICAL SIGNIFICANCE. Acta Hortic. 1078, 41-48
seed morphometry, SEM, Coelogyne, Cymbidium, Pholidota, interrelationships, ecological significance