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Manuscript 1143; Received 20 Jan 2004; Finally accepted 15 June 2004; © Zoo Outreach Organisation; www.zoosprint.org 1606 ABSTRACT The present investigation deals with pollen biology (in vitro and in vivo pollen germination) of four endemic balsams from the Western Ghats, namely, Impatiens diversifolia, I. fruticosa, I. trichocarpa and I. verticillata. Twenty percent sucrose medium supplemented with 150ppm boric acid was found to be the best for in vitro pollen germination. In vivo pollen germination in all the selected species were studied in different time intervals after anthesis. The results indicated that in I. diversifolia and I. trichocarpa, maximum stigma receptivity of 80% and 70% were observed for up to 18 hours with pollen germination of 66% and 62%, respectively. The other two species I. verticillata and I. fruticosa have extended their stigma receptivity for up to 15 and 24 hours with 60% and 40% receptivity but having recorded a low of 36% and 23% pollen germination respectively.

Pollen biology of four endemic balsams from the Western Ghats