陆地棉珠孔的结构及花粉管在其中的生长途径  

STRUCTURE OF MICROPYLE IN GOSSYPIUM HIRSUTUM AND THE PATHWAY OF POLLEN TUBE GROWTH

作　　者：张劲松[1] 何才平 杨弘远[1] 

机构地区：[1]武汉大学生命科学学院植物生殖生物学研究室,武汉430072

出　　处：《Acta Botanica Sinica》1994年第9期727-729,共3页Acta Botanica Sinica（植物学报：英文版）

基　　金：高等学校博士点专项科研基金;国家自然科学基金

摘　　要：The micropyle of Gossypium hirsutum consists of an exostome and an endostome.On semithin serial transections, the exostome was visualized as a branched narrow gap except its outer and inner openings, whereas the endostome only a narrow linear gap. Ultrastructurally, the micropyle gap was formed by the integumental epidermal cells coated with a cuticle.The cells lining the micropyle gap were characterized by a large nucleus and abundant organelles as mitochondria, plastids, rough endoplasmic reticulum, vesicle secreting dictyosomes and small vacuoles.One or two pollen tubes were seen growing through the exostome and endostome gaps.Thus, the micropyle in cotton was basically a closed type as has been found in sunflower, but similar asymmetrical structural features were not observed.The micropyle of Gossypium hirsutum consists of an exostome and an endostome.On semithin serial transections, the exostome was visualized as a branched narrow gap except its outer and inner openings, whereas the endostome only a narrow linear gap. Ultrastructurally, the micropyle gap was formed by the integumental epidermal cells coated with a cuticle.The cells lining the micropyle gap were characterized by a large nucleus and abundant organelles as mitochondria, plastids, rough endoplasmic reticulum, vesicle secreting dictyosomes and small vacuoles.One or two pollen tubes were seen growing through the exostome and endostome gaps.Thus, the micropyle in cotton was basically a closed type as has been found in sunflower, but similar asymmetrical structural features were not observed.

关 键 词：陆地棉 珠孔 超微结构 生长 

分 类 号：S562.01[农业科学—作物学]