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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/01/2010 |
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Data da última atualização: |
28/01/2019 |
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Autoria: |
LARSON, D. A. |
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Título: |
Fine-structural changes in the cytoplasm of germinating pollen. |
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Ano de publicação: |
1965 |
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Fonte/Imprenta: |
American Journal of Botany, v. 52, n. 2, p. 139-154, 1965. |
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DOI: |
DOI: 10.2307/2440229 |
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Idioma: |
Inglês |
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Conteúdo: |
Quiescent and germinated pollen grainis of Parkinsonia aculeata, Hymenocallis occidentalis, Hippeastrum belladonna, and Ranunculus macranthus were studied electron microscopically following KMnO4-fixation, and comparisons between the 2 developmental stages were made. In the process of germination, mitochondrial structure characteristically remains unchanged from the quiescent stage form, while other organelles undergo significant modifications. In all 4 species, the Golgi apparatus becomes secretory, producing large vesicles which migrate to the cell surface and contribute substrate(s) to the forming pollen tube wall. In Hymnenocallis and Hippeastruin, plastids initiate starch storage only after germination begins; this appears to involve an increase in plastid lamellae. Vacuoles arise in germinating pollen of P. aculeata from elements of the ER, while in the other 3 species vacuoles develop from "prevacuolar bodies." Generative cell structure, vegetative nuclear structure and a unique plasma nmembrane-ER relationship in H. belladonna are briefly described. |
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Thesagro: |
Citologia; Pólen. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01509naa a2200157 a 4500
001 1836121
005 2019-01-28
008 1965 bl --- 0-- u #d
024 7 $aDOI: 10.2307/2440229$2DOI
100 1 $aLARSON, D. A.
245 $aFine-structural changes in the cytoplasm of germinating pollen.
260 $c1965
520 $aQuiescent and germinated pollen grainis of Parkinsonia aculeata, Hymenocallis occidentalis, Hippeastrum belladonna, and Ranunculus macranthus were studied electron microscopically following KMnO4-fixation, and comparisons between the 2 developmental stages were made. In the process of germination, mitochondrial structure characteristically remains unchanged from the quiescent stage form, while other organelles undergo significant modifications. In all 4 species, the Golgi apparatus becomes secretory, producing large vesicles which migrate to the cell surface and contribute substrate(s) to the forming pollen tube wall. In Hymnenocallis and Hippeastruin, plastids initiate starch storage only after germination begins; this appears to involve an increase in plastid lamellae. Vacuoles arise in germinating pollen of P. aculeata from elements of the ER, while in the other 3 species vacuoles develop from "prevacuolar bodies." Generative cell structure, vegetative nuclear structure and a unique plasma nmembrane-ER relationship in H. belladonna are briefly described.
650 $aCitologia
650 $aPólen
773 $tAmerican Journal of Botany$gv. 52, n. 2, p. 139-154, 1965.
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Embrapa Trigo (CNPT) |
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