摘要
利用常规石蜡制片技术研究了羽毛针禾(Stipagrostis pennata(Trin.)de Winter)大、小孢子发生及雌、雄配子体的发育过程.主要结果有:(1)花药壁由3层结构组成,最外层为表皮,其次为药室内壁,最内层为分泌型绒毡层;(2)小孢子母细胞减数分裂过程中的胞质分裂为连续型,四分孢子为左右对称型;(3)成熟花粉粒为3细胞型,具单萌发孔,羽毛针禾精子排列存在两种情况:一种是两枚精子近乎平行位于营养核一侧,另一种是羽毛针禾有少数花粉的两条眉状精子呈"八"字形排列;(4)羽毛针禾为单子房、单胚珠、双珠被、薄珠心、倒生型胚珠,大孢子母细胞减数分裂形成线型或T型排列的4个大孢子,合点端大孢子具功能;(5)胚囊发育为蓼型,反足细胞经无丝分裂形成多个细胞的反足细胞群.
This paper studies megasporogenesis microsporogenesis and the development of female and male gametophyte of S. pennata （Trin.） de Winter by means of paraffin wax. Them ain results are as follows：（1）The wall of anther consist s of three layers：epidermis,endothecium and tapetum from out to in side. Tapetum cell is of secretory type.（2）Cytok inesis of microsporocyte meiotic division is of successive type.（3）Mature pollen grain is of 3-celled type.（4）There are one ovary and one ovule. The ovule is double in teguments,tenuinucellate and anatropous. Megasporocyte meiotic divides into four megaspores in line type or T-type. The megaspore near chalazae is the functional one. （5）Embryosac is of Polygonum type.Antipodal cells amitotic divide to many cells in mature embryosac.
出处
《伊犁师范学院学报（自然科学版）》
2010年第3期34-37,共4页
Journal of Yili Normal University：Natural Science Edition
基金
国家自然科学基金(30660031)
国家重大基础研究前期研究专项(2004CCA02800)资助
关键词
羽毛针禾
大孢子发生
小孢子发生
雄配子体
雌配子体
S.pennata
megasporogenesis
microsporogenesis
male gametophyte
female gametophytes
