Morphogenese Der Laubmoose

Studies on Cytokinin-Controlled Bud Formation in Moss Protonemata

“…The development of moss protonemata has been described in detail by Bopp (5,9). Figure 1 summarizes figure 2.…”

Cytokinins from the Moss Physcomitrella patens

“…During its development, moss tissue passes through several distinct phases of growth each being characterized by specific cell types (3)(4)(5). One of the latter stages in moss morphogenesis is the production of leafy shoots or gametophores which eventually give rise sexually to the sporophyte generation and the production of spores.…”

Development of the protonema and bud formation in mosses

“…On the other hand, protonemata a r i s i i from spores lying only 3 mm. apart grow completely together to form a common protonema, which even in bud formation behaves as one single protonema (Bopp, 1961). Previously I have shown elsewhere (Bopp, 1959) that this type of inhibition between single protonema does not involve a competition for nutritive materials or a depletion of the substrate, but that it is a true inhibition caused by substancea excreted by the protonema (cf.…”

“…The 'fairy rings' formed are always wery sharply dehed. On each branch-bent of a caulmema cell in the bud-forming region at least one and often several buds appear, showing that in this region all the cells become reaction cells (Bopp, 1961). Parallel with the increase in number, the development of the buds becomea increasingly more inhibited, but this inhibition is due to the large number of competing buds, not to the concentration of kinetin.…”

“…Recent investigations have shown that there is a close relationship between the development of the protonema of mosses and the formation of buds. Therefore in a study of bud formation the development, or more exactly the differentiation, of the protonema must be taken into consideration (Bopp, 1959(Bopp, , 1961Kofler, 1959). Accordingly, extensive conclusions about bud formation can be made from the differentiation of the protonema.…”