Studies on Production and Behavior of Protonemal Gemmae in Some Bryaceae

Publisher Website
Google Scholar
Abstract
The following members of the Bryaceae: Bryum klinggraeffi Schimp., B. coronatum Schwaegr. and Leptobryum pyriforme (L.) Schimp were studied. At 20-25.degree. C the secondary protonema of B. klinggraeffii produces gemmae. Their initiation is correlated with protonemal age and growth. Under similar conditions the protonema of B. coronatum develops gemma-like bodies with a few rudimentary leaves, whereas in Leptobryum normal gametophores are formed. B. klinggraeffii gemmae are formed at or above 20.degree. C both in dark and light, whereas at lower temperatures (10.degree.-15.degree. C) larger, lobed, green structures, as well as stunted gametophores, develop in light. Under the influence of kinetin (1.0 ppm) moruloid buds differentiate on the protonema, but with the decreasing concentration of kinetin gemma-like structures are produced. A previously formed young, green gemma develops into a stunted gametophore when treated with 1.0 ppm kinetin. In B. coronatum leafless structures resembling its rhizoid-borne gemmae are formed at 30.degree. C in light as well as in dark. In Leptobryum, gemmae develop on protonemata and gametophores in the dark. Gemmma formation in Bryum spp. appears to be similar to the budding response of protonemata. This shift in the pattern of differentiation is due to non-availability of low temperature and sufficient light. On the contrary, the dark-induced gemmae of Leptobryum fail to develop into buds under conditions favorable for gametophore formation, and kinetin has no effect on their further development.

This publication has 1 reference indexed in Scilit: