A new antheridiogen fromPityrogramma calomelanos of the family Polypodiaceae (Sensu Bower) has been extracted and tested onPityrogramma calomelanos, Onychium siliculosum (Desv) C. chr, andOnychium japonicum (Thbg) Kze. The antheridiogen, here designated as Apit, did not produce uniform effect on the species tested. It promotes dark germination in all, but induces antheridia only inPityrogramma calomelanos andOnychium siliculosum under light and dark conditions. The antheridium-inducing capacity of Apit is markedly different on the two ferns, being more vigorous under light condition inPityrogramma calomelanos and less inOnychium siliculosum. Contrary to this, more antheridium-bearing prothalli have been counted in the latter under darkness. Higher dilutions are less effective in both. Dark germination has been found most effective in case ofOnychium japonicum. The results indicate that the intensity of the effect of antheridiogen varies under different conditions and between species of the same genus. Also, an antheridiogen is not specific in the induction of antheridia or dark germination of spores, but it may initiate any of the two or both.
- 1 - sciences appliquees, technologies et medecines
- 2 - sciences biologiques et medicales
- 3 - sciences biologiques fondamentales et appliquees. psychologie
- 4 - psychologie. psychophysiologie