| 翻訳と辞書 |
leptoid
A leptoid is a type of elongated food-conducting cell in the stems of some mosses, such as the family Polytrichaceae. They surround strands of water-conducting hydroids. They have some structural and developmental similarities to the sieve elements of seedless vascular plants. At maturity they have inclined end cell walls with small pores and degenerate nuclei. The conduction cells of mosses, leptoids and hydroids, appear similar to those of fossil protracheophytes. However they are not thought to represent an intermediate stage in the evolution of plant vascular tissues but to have had an independent evolutionary origin.〔Renzaglia,K.S., Schette, S. and Duff, R.J. (2007) Bryophyte phylogeny: advancing the molecular and morphological frontiers. ''Bryologist'', 110'', 179-213.〕
==See also==
*Hydroid, a related water-transporting cell analogous the xylem of vascular plants
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「leptoid」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.
|
|