Contributions to the knowledge of the life history of Pinus with special reference to sporogenesis, the development of the gametophytes and fertilization

Ferguson, Margaret C.

doi:10.5962/bhl.title.24611

Cited by 29 publications

(73 citation statements)

References 2 publications

(3 reference statements)

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“…12,13,14). Second, interphase chromosomes of pine are attached to the nuclear membrane and together with nucleoli are essential for the completion of a cell cycle (Ferguson 1904). The nuclear membrane has also been postulated to also mediate the initiation of DNA synthesis (Ephrussi and Weiss 1967;Hearst and Botchan 1970).…”

Section: Discussionmentioning

confidence: 99%

The metabolism and subcellular organization of the jack pine embryo (Pinus banksiand) during germination

Durzan¹,

Mia²,

Ramaiah³

1971

Can. J. Bot.

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1971. The metabolism and subcellular organization of the jack pine embryo (Pinus banksiana) during germination. Can. J. Bot. 49: 927-938. Les graines de Pin grts (Pinus but~ksiat~a) imbibCes d'eau absorberent rapidement de I'oxygene et 95% d'entre elles germerent. A mesure que les cellules des cotyledons grossissaient et se divisaient, la redistribution des hydrates de carbone, protdines et acide~ nucleiques, sous observation cytochimique, correspondait a certains chanqements dans I'organisation subcellulaire.Chez !es cotyledons dormants, il n'y avait aucun chloroplaste dans les cellules; cependant les rberves en lipides, les protides et les arnyloplastes abondaient. Mais apres 97 h dans I'eau, les rCserves en nourriture furent entiirernent consurrees, le nouveau cytoplasme apparut et de nombreuses particules similipolyscrnes quitterent le noyau et se repandirent dans le cytoplasme. Correspondant au premier cycle mitotique, les proportions de nucleotides solubles dans I'acide, d'ARN et d'ADN augnlentirent pendant les 4 premiers jours de la germination. L'ARN etait concentre dans les phrag~nosomes et dans les plaques cell~~laires nouvellement formees. Les proteines acidiques, d'abord trouvees surtout dans les protides des cellules seches, se trouvaient maintenant dans les nucleoles. Les histones Ctaient surtout associes aux chromosomes, bien que les proteines de reserve, riches en arginine, fussent observees dans les protides des cellules dormantes. Les proplastides, qui tventuellement se developperent dans les chloroplastes demeuraient t o~~t pres du noyau jusqu'a I'utilisation quasiment totale des reserves cytoplasrniques.Au moment oh le cotyledon etait "sevre," le cytoplasme des cellules en pleine croissance contenait plus de mitochondries, aussi de I'endoplasme brut reticulaire, des ribosomes, des appareils de Golgi et des chloroplastes a au pluq quatre grains d'amidon. Dix A d0ui.e jours apres le debut de la germination, le cytoplasme apparut sur le pourtour des membranes cellulaires par suite, de I'accumulation d'eau dans une grande vacuole.Water imbibed by jack pine seeds induced rapid oxygen uptake and over 95% germination. As cells of cotyledons expanded and divided the redistribution of carbohydrates, proteins, and nucleic acids, followed cytochemically, corresponded to changes in subcellular organization.In dormant cotyledons, cells lacked chloroplasts and were packed with lipid reserves, protein bodies, and a~nyloplasts. After 96 h of imbibing water, storage materials were consumed as new cytoplasm appeared and numerous polysome-like particles extended from the n~tcleus into the cytoplasnl. Levels of acid-soluble n~~cleotides, RNA. and DNA increased up to the f o~~r t h day of germination coinciding with the completion of the first mitotic cycle. RNA was concentrated in phragmoso~nes and at the newly formed cell plates. Acidic proteins, found mainly in the protein bodies of dry cells, were now localized in nucleoli. Histones were associated mainly with chromosomes, although in dormant cells, reserve pr...

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Section: Discussionmentioning

confidence: 99%

The metabolism and subcellular organization of the jack pine embryo (Pinus banksiand) during germination

Durzan¹,

Mia²,

Ramaiah³

1971

Can. J. Bot.

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“…Both the prothallials are ephemeral (cf Cycadales and Ginkgoales). Pollination takes place at the four-nucleate stage [Strasburger, 1892;Coulter and Chamberlain, 1917;Ferguson, 1904;Johri, 1935;Konar and Ramachandani, 1958;Konar, 1960;Maheshwari and Konar, 1971;Owens and Molder, 1977;1979;Moitra, 19801. The two prothallials are cut off when the intine is being laid down.…”

Section: Coniferalesmentioning

confidence: 99%

Ultrastructure, cytochemical, and histochemical studies on pollen and male gamete development in gymnosperms

Moitra

Bhatnagar

1982

Gamete Research

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“…The exudation and subsequent resorption of a drop of liquid pulls the grain through the micropyle to the surface of the nucellus where the grain develops a pollen tube directed into the nucellar tissue. Growth ceases over the winter but resumes again the following spring when the pollen tube completes its passage through the nucellus into the neck of an archegonium where it ruptures, releasing the stalk cell and the tube and sperm nuclei (1,3,4,9,13). During this year of life the pollen grain develops a relatively long tube and presumably respires actively except for the cold winter months.…”

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Exogenous Substrate Utilization and Fermentation by the Pollen of Pinus ponderosa.

Hellmers

Machlis

1956

Plant Physiol.

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Contributions to the knowledge of the life history of Pinus with special reference to sporogenesis, the development of the gametophytes and fertilization

Cited by 29 publications

References 2 publications

The metabolism and subcellular organization of the jack pine embryo (Pinus banksiand) during germination

The metabolism and subcellular organization of the jack pine embryo (Pinus banksiand) during germination

Ultrastructure, cytochemical, and histochemical studies on pollen and male gamete development in gymnosperms

Exogenous Substrate Utilization and Fermentation by the Pollen of Pinus ponderosa.

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