Abstract
Abstract: The climate of Rajasthan is xeric and lacks precipitation but still a good number of pteridophyte, which are shade loving plants and require low temperature and high humidity, grow in different parts of this state. For the present study, the fern Christella dentata was selected and three site were chosen for collection the plant material viz. Nakki lake (Mt. Abu), Sitamata Forest (Baran) and Sitabari (Pratapgarh). In this investigation, the aspects of spore germination and reproductive biology of C. dentata were carried out under the influence of varied concentrations of gibberellic acid GA3. The various populations belonging to the study area exhibited remarkable uniformity in their developmental biology. The mature prothallus is cordate with a prominent midrib bearing rhizoids and sex organs. Studies of effects of GA3 have revealed that 50 ppm of its concentration lead to maximum spore germination and 1- D growth. Maximum 2-D growth was attained at 10 ppm while 20 ppm GA3 could not support gametophytic development to that extent and 100 ppm proved to be lethal. Presence of GA3 in general suppresses the archegonia development and also the development of first leaf of sporophyte
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