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- W2023247502 abstract "Ultrastructural changes during omniaperturate pollen development in Trillium kamtschaticum Pall, was examined using transmission electron microscopy. The pollen mother cells are not enveloped within a thick callosic wall. The microspores resulting from successive meiosis are divided by scanty deposition of callosic wall in the tetrad. A primexine/exine template is not recognizable within the tetrad during formation of exinous components. Preexinous globules, originating from vesicles in the callosic wall, accumulate electron‐dense materials and develop into exinous globules. The preexinous globules have ca 10 nm wide contacts with tilted and invaginated plasma membrane of the microspore within the callosic wall. After dissolution of the callosic wall, the microspores separate and mitosis subsequently leads to the formation of a generative cell and vegetative cell encased in a loose aggregation of developing exinous globules. When the generative cell is at the pollen grain surface, the channeled zone is initiated at the opposite side of the microspore on the surface of the vegetative cell. Just before pollen maturity, a new layer develops under the channeled zone. Thus, development of the omniaperturate pollen grains of T. kamtschaticum involves some processes that are distinct from those of Canna and Heliconia and some that are similar." @default.
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- W2023247502 date "1987-12-01" @default.
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- W2023247502 title "DEVELOPMENT OF OMNIAPERTURATE POLLEN IN TRILLIUM KAMTSCHATICUM (LILIACEAE)" @default.
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- W2023247502 doi "https://doi.org/10.1002/j.1537-2197.1987.tb08786.x" @default.
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