期刊论文

中文

植物科学学报

2095-0837

2015

33

3

271-280

10.11913/PSJ.2095-0837.2015.30271

林业公益性行业科研专项项目（201104033）；

本校为第一机构

南方红豆杉(Taxus chinensis var. mairei)为第三纪孑遗树种,也是我国Ⅰ级保护植物。本文通过对其大孢子发生及雌配子发育过程进行细胞学观察发现,南方红豆杉胚珠多为直立单生,偶见1个苞片内着生2个胚珠;大孢子母细胞减数分裂形成4个大孢子,其中3个退化,仅位于合点端的大孢子发育为功能性大孢子;功能性大孢子经过有丝分裂形成256个游离核;颈卵器单生,2~6个;从传粉到受精约2个月;有16个原胚自由核,原胚为标准型;简单多胚和裂生多胚并存,胚发育不同步。因南方红豆杉胚珠直立单生、游离核数目、传粉到受精间隔期、原胚游离核数目等特征与松科差异较大,而与广义柏科具有许多相似之处,故我们支持将红...

Taxus chinensis var.mairei,one of the tertiary relic species,is one of the state first class protected species and endemic to China.Over the course of three years,we observed the external morphological changes from cone bud emergence to seed cone formation and the internal cellular changes during megasporogenesis,gametophyte development and embryo-genesis using paraffin-embedded-sectioning and hematoxylin-staining methods. Most ovules were only orthotropous,but two ovules wrapped within one bract could be seen occasionally.The meiotic division ...