Abstract
Phytphormones such as auxins, cytokinins, gibberellins, and abscisic acid differentially affect gametangial induction in male and female clones of Bryum argenteum. Both IAA and GA3 increased the percentage of fertile gametophores in the male clone, and inhibited the response in the female clone. GA3 was more effective than IAA in eliciting the response in the male clone. Cytokinins, on the other hand, increased the production of fertile gametophores in the female clone, and inhibited it slightly in the male clone. The two cytokinins tested (kinetin and DMAAP) were almost equally effective for the female clone. An interaction of IAA and kinetin nullified their individual inhibitory effects on the female and male clones, respectively. Cyclic AMP prevented the inhibitory effect of kinetin in the male clone; whereas, in the female clone, it stimulated the response elicited by kinetin. Abscisic acid (ABA) acted as a general inhibitor of vegetative growth and gametangial induction in this moss. However, the inhibition of gametangial induction was greater in the female clone which is also more sensitive to ABA than the male clone.
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