The development and structure of the chalazal endosperm haustorium in Cannabis sativa are described. The endosperm is nuclear and a haustorium is formed at the chalazal end. The latter remains free nuclear throughout. Enucleate vesicles appear in the upper part of the endosperm but finally they merge with the cytoplasm of the haustorium. As the embryo reaches maturity it occupies the whole seed cavity, the haustorium collapses and the endosperm persists only as a thin layer. Most users should sign in with their email address.
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A large amount of wall ingrowths interweaved network, dense cytoplasm with abundant mitochondria, ER and dictyosomes, and marked large nuclei and nucleoli are found in the haustorial cells connected endosperm cells with numerous plasmodesmata. Two cuticular layers are observed between the integumentary typetum and embryo sac, which enclose the embryo sac from all sides but leave an apture at each pole where a edosperm haustorium is formed.
The main role of endosperm haustoria is to absorb and transport nutrients to endosperm from sporophyte during its development.
Occurrence of Endosperm Haustoria in some Cucurbitaceae
Studies on the structure of endosperm haustoria in Platycodon grandiflorum A.DC