翻訳と辞書 Words near each other ・ Gemmula lordhoweensis ・ Gemmula lululimi ・ Gemmula luzonica ・ Gemmula microscelida ・ Gemmula monilifera ・ Gemmula murrayi ・ Gemmula mystica ・ Gemmula periscelida ・ Gemmula praesignis ・ Gemmula pseudogranosa ・ Gemmula pseudomonilifera ・ Gemmula rarimaculata ・ Gemmula rosario ・ Gemmula rotatilis ・ Gemmula sibogae ・ Gemma (botany) ・ Gemma (disambiguation) ・ Gemma (organization) ・ Gemma Acheampong ・ Gemma Arró Ribot ・ Gemma Arterton ・ Gemma Atkinson ・ Gemma Augustea ・ Gemma Barker case ・ Gemma Beadsworth ・ Gemma Bellincioni ・ Gemma Bishop ・ Gemma Bissix ・ Gemma Bond ・ Gemma Bonner Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Gemma (botany) ： ウィキペディア英語版 Gemma (botany) A gemma (plural ''gemmae'') is a single cell, or a mass of cells, or a modified bud of tissue, that detaches from the parent and develops into a new individual. This type of asexual reproduction is referred to as fragmentation. It is a means of asexual propagation in plants. These structures are commonly found in fungi, algae, liverworts and mosses, but also in some flowering plants such as pygmy sundews and some species of butterworts. Vascular plants have many other methods of asexual reproduction including Bulbils and Turions. == In mosses and liverworts == The production of gemmae is a widespread means of asexual reproduction in both liverworts and mosses. In liverworts such as ''Marchantia'', the flattened plant body or thallus is a haploid gametophyte with gemma cups scattered about its upper surface. The gemma cups are cup-like structures containing gemmae. The gemmae are small discs of haploid tissue, and they directly give rise to new gametophytes. They are dispersed from gemma cups by rainfall.〔Smith, AJE (1989) ''The Liverworts of Britain and Ireland'', Cambridge University Press, Cambridge.〕 The gemmae are bilaterally symmetrical and are not differentiated into dorsal and ventral surfaces. The mature gemmae fall on the ground and if conditions are suitable their germination starts immediately. The surface of the gemma which comes in contact of the soil gives out many rhizoids. This surface eventually becomes the lower(ventral) surface of the thallus. Meanwhile, the apical cells present in the two lateral notches become active and form two thalli in opposite directions. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gemma (botany)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.