Ligrone R, Renzaglia K S
Dipartimento di Biologia vegetale dell'Università di Napoli, via Foria 223, I-80139 Napoli, Italy.
Department of Biological Sciences, East Tennessee State University, Johnson City, Tennessee 37614, USA.
New Phytol. 1989 Feb;111(2):197-201. doi: 10.1111/j.1469-8137.1989.tb00682.x.
The placenta of two Sphagnum species was examined by electron microscopy. In contrast to all mosses so far investigated, neither sporophyte nor gametophyte placental cells of Sphagnum develop wall ingrowths. The sporophyte cells are highly vacuolate and the gametophyte cells close to them degenerate to produce a system of spaces filled with mucilage. Whether this type of placenta represents a primitive or derived condition in mosses is discussed.
通过电子显微镜检查了两种泥炭藓属植物的胎盘。与迄今为止研究过的所有苔藓不同，泥炭藓的孢子体和配子体胎盘细胞均未发育出细胞壁内突。孢子体细胞高度液泡化，靠近它们的配子体细胞退化，形成一个充满黏液的间隙系统。本文讨论了这种类型的胎盘在苔藓中是代表原始状态还是衍生状态。
