Study on the Development of Protonema in Family Bryaceae
|Keywords||Bryaceae Spore germination Protonema Development Gametophyte occurs The original Protonema culture|
The stage of bryophytes spore germination Protonema bryophytes the life cycle of the first stage, a necessary stage also develop into a gametophyte. The protonema development stage is the Mosses unique characteristics is also a distinctive feature different from the other groups taxon. Spore germination and protonema development has a very important role to elucidate the the phylogenetic system evolution of bryophytes. This stage bryophytes system of classification, ecological adaptation, reproduction, evolution has a close relationship. Bryophytes Protonema development and training research has important theoretical and practical significance. In this paper, 4 families, 7 genera and 23 kinds of mosses spore germination characteristics of the experimental study, 19 species (belonging to two families and genera) is the first report. The world of Bryaceae (Bryaceae) about 20 genera and about 1,400 species of moss large family, widely distributed around the world. China has 11 genera, 170 species . The are Acrocarpous Mosses Bryaceae is more complex evolution of morphology in bryophytes groups. Rich Bryaceae habitat types, the wide adaptability often pulvinate clusters, certain kinds of good sand-fixing pioneer plant; Bryaceae some kind of important medicinal value; small plant of Bryaceae, soft, high ornamental value, and is a good experimental material for the teaching of biology. Therefore, this article will Bryaceae as the main object of study and closer to the Bryaceae genetic relationship hoist Musci and Mnium of plants each, genetic relationship with Bryaceae, far, purple calyx moss plants as a control material to study analysis to explore the the system evolutionary relationships between the Bryaceae and its related families and genera. The main findings are as follows: 1) an overview of the economic value of the ecological functions of the bryophytes; Mosses spore germination and Protonema developmental research significance; summary of the history of developmental research at home and abroad moss strand and since the 1990s, about mosses Protonema in Ca2 · CAM signal system, plant hormones, Photomorphogenesis and gravity response, cell and molecular biology, bio-pharmaceutical and other fields, new progress. 2) microscopic observation method describes 23 mosses species spore germination, protonema development and gametophyte the characteristics and laws. Select spore germination, during the nine main characteristics of the original silk body development and gametes body, 21 indicators, 23 kinds of moss plants of the original silk body development characteristics, to supplement and improve the germination of spores type classification based on germination of the Mosses spores used in this study and Protonema development characteristics are described in detail and classified and analyzed the classified results. Germination of spores type and mosses system of classification, ecological adaptation, reproductive strategies and phylogenetic relationship between. 3) the development and utilization of bryophytes, we must first solve the issues of culture and breeding. The moss plant tissue culture is pure and sterile Materials related research and production practice. This article explored the the Mosses Protonema and gametophyte indoor artificial culture conditions and methods laid the foundation for large-scale cultivation of bryophytes.