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Hormonal Regulation of Development in Mosses

Chapter
Part of the Advances in Agricultural Biotechnology book series (AABI, volume 21)

Abstract

The protonema of mosses is a “morphogenetic system”, meaning that all members of the system are necessary to constitute the normal morphogenesis (Bopp, 1965). The best analysed “system” is the protonema of Funaria hygrometrica, in which the differentiation steps follow each other in a clear sequence. Each step occurs on definite cell types separating the different phases of the first part of gametophytic development (protonema). Upon germination, spores of the moss produce filaments with transverse septae separating adjacent cells. The cells contain many rounded chloroplasts distributed throughout, and the branching is irregular. These filaments constitute chloronema. After attaining a definite physiological maturity (Knoop, 1984), the apical cell of each chloronema filament changes its shape in a continuous process. producing cells containing fewer chloroplasts mainly accumulated in the apical region, oblique cell walls between adjacent cells and a very regular branching: the caulonema. The side branches of the caulonema have a chloronema-like morphology in the beginning. Therefore. Cove and Ashton (1984) called them “secondary chloronema” in contrast to the primary chloronema arising from spores or from the regenerating tissue. But in most cases, the side branches give rise to new caulonema filaments. Its more detailed account is given by Knoop (1984). In many mosses of the “Funaria type” (Bopp, 1961), very young side branches of the first and second order can be transformed into buds in a third step, which constitute early stages of gametophore development.

Keywords

Side Branch Plant Growth Substance Ceratodon Purpureus Gametophytic Development Auxin Uptake 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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© Martinus Nijhoff Publishers, Dordrecht and Agro Botanical Publishers (India). 1987

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