Abstract: The unusual phenomenon of pollen germination prior to their release from anthers was studied in detail in different samples of flowers collected from different geographical regions of India viz. Eastern Himalayan region (Teesta valley near Darjeeling, West Bengal), Western Himalayan region (Yamuna bridge near Mussoorie and Pauri Garhwal district), Gangetic plains (Katerniaghat wildlife sanctuary, Uttar Pradesh) and arid region of Rajasthan (Mount Abu). Though pollen germination prior to their release was regularly observed during the study, it varied at different level of anther and stigma and in different geographical regions. Highest i.e. 7.31% of such type of pollen germination was recorded in the samples of Pauri Garhwal of Western Himalayan region followed by 3.45% from Mussoorie of the same region when flower was at its initial stage of opening and pistil was short and below the level of anther. This phenomenon of pollen germination was regularly absent in the samples of Eastern Himalayan region.
Fig.: Precocious pollen germination in Woodfordia fruticosa. A, section of anther lobe showing germinated pollen grains; B–D, germinating pollen grains with pollen tubes of varying length; E, germinated pollen grains forming cluster.