The Embryonic Development Study on Isoetes yunguiensis, an Endangered and Relict Pteridophyta

doi:10.7677/ynzwyj201514171

Abstract

Abstract:

Isoetes yunguiensis is a specialty relict fern of YunnanGuizhou Plateau,which is a national level protected species called living fossil of the study on paleoecology and plant evolutionary in Yunnan and Guizhou area, but its reproduction and endangered mechanism is unclear. On the basis of implementation of artificial breeding and acquisition of adequate research materials, the authors observe the embryonic development of Iyunguiensis using thin sectioning. The main results of observation of the embryonic development are as follows: (1) The zygote doesn’t have the period of dormancy; (2) The angle between the division planes of zygote and the long axis of archegonium is about 30°; (3) The first leaf primordium and the first root primordium develop first. However, the first leaf primordium develop earlier than the first root primordium; (4) The initial cells of ligule begin to divide since the initial stage of the development of leaf; (5) The cells of the openend of archegonium often appear necrosis and affect the embryonic development; (6) The embryo malformation is easy to happen; (7) The sheet structure develop fast, and it provide good protect for the second and third leaf primordium; (8) The order of early vascular development. The article explore the reproductive biology regular and reproductive endangered mechanism of Iyunguiensis. The coalescent form of the original evolution of vegetative organs of vascular plants is analyzed. This article also accumulate technical data for protection of Iyunguiensis.

Key words: Isoetes yunguiensis, Embryonic development, Organ of origin, Endanger

CLC Number:

Q 944

JIANG Zi-Wei, LIU Bao-Dong, CHENG Xiao, LI Xiao-Dong. The Embryonic Development Study on Isoetes yunguiensis, an Endangered and Relict Pteridophyta[J]. Plant Diversity, 2015, 37(05): 531-536.

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