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J Integr Plant Biol, 1994, 36 (9): -, Research Article
Structure of Micropyle in Gossypium hirsutum and the Pathway of Pollen Tube Growth
Zhang Jin-song, He Cai-ping and Yang Hong-yuan
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.
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