Orchid Embryology: The Membrane Systems and the Pollen Tube Growth

Cocucci, Alfredo E.

doi:10.1080/00087114.1973.10797124

Cited by 10 publications

(3 citation statements)

References 9 publications

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“…11 are probably interpretable as a membrane reservoir for the fast growth of the wing cells. Such function was also attributed by Cocucci (1973) and Brighigna et al (1980) to myelin-like figures in the pollen grain of T. caput-medusae to be employed at the onset of pollen germination.…”

Section: Discussionmentioning

confidence: 91%

The ultrastructure of the development of Tillandsia (Bromeliaceae) trichome

Papini

Tani

Falco

et al. 2010

Flora - Morphology, Distribution, Functional Ecology of Plants

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Section: Discussionmentioning

confidence: 91%

The ultrastructure of the development of Tillandsia (Bromeliaceae) trichome

Papini

Tani

Falco

et al. 2010

Flora - Morphology, Distribution, Functional Ecology of Plants

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“…Comparative evolutionary developmental analyses of the four‐nucleate, four‐celled female gametophytes in the ancient angiosperm lineages Nymphaeales and Austrobaileyales led to the key insight that the female gametophytes of all flowering plants are fundamentally modular entities (Friedman and Williams, 2003, 2004; Friedman et al, 2008) composed of iterative sets of quartets of nuclei (sensu Porsch, 1907; Schnarf, 1936; Cocucci, 1973; Favre‐DuChartre, 1976; Battaglia, 1989; Haig, 1990). Development of a standard angiosperm female gametophyte module involves three basic ontogenetic stages: (1) positioning of a single nucleus within a developmentally autonomous cytoplasmic domain of the female gametophyte; (2) two free‐nuclear mitoses to yield four nuclei within that domain; and (3) partitioning of three uninucleate cells adjacent to the pole such that the fourth nucleus is confined to the central cell of the female gametophyte (Fig.…”

Section: Discussionmentioning

confidence: 99%

Reconstructing the ancestral female gametophyte of angiosperms: Insights from Amborella and other ancient lineages of flowering plants

Friedman

Ryerson

2009

American J of Botany

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For more than a century, the common ancestor of flowering plants was thought to have had a seven-celled, eight-nucleate Polygonum-type female gametophyte. It is now evident that not one, but in fact three, patterns of female gametophyte development and mature structure characterize the common ancestors of the four most ancient clades of extant angiosperms: Amborella-type, Nuphar/Schisandra-type and Polygonum-type. The Amborella-type female gametophyte is restricted to a single extant species, Amborella trichopoda, and at maturity consists of eight cells and nine nuclei. Development of the Amborella-type gametophyte is essentially identical to the Polygonum-type except that there is an additional and asynchronous cell division at the micropylar pole prior to maturation that produces a third synergid and the egg cell. The Nuphar/Schisandra-type female gametophyte is four-nucleate and four-celled and at maturity contains a typical three-celled egg apparatus and a central cell with a single haploid polar nucleus. This type of gametophyte appears to be universal among extant members of the Nymphaeales (including Hydatellaceae) and Austrobaileyales. Based on explicit reconstruction of character distribution and evolution, the Polygonum-type female gametophyte is certain to be representative of the common ancestors of monocots, eudicots, magnoliids, Ceratophyllaceae, and Chloranthaceae. There are compelling biological reasons to suggest that the four-celled, four-nucleate female gametophyte (as found in Nymphaeales and Austrobaileyales) is ancestral among angiosperms, with transitions to Polygonum-type female gametophytes separately in the Amborellales and in the ancient angiosperm clade that includes all angiosperms except Amborella, Nymphaeales, and Austrobaileyales. Subsequent to the evolution of a seven-celled, eight-nucleate Polygonum-type female gametophyte in the Amborellales, we hypothesize that a peramorphic increase in egg apparatus cell number took place and led to the unique situation in which there are three synergids in Amborella trichopoda.

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“…The persistent occurrence of RER associated with vacuoles, which from the 2nd stage onward envelop the lipid droplets, suggests that a transformation process of these reserves is involved: the progressive reduction in number of the lipid droplets accompanied by the appearance of strongly osmiophilic material inside the vacuoles suggests that such substances have undergone some process to render them readily available at the time of germination. Cocucci (1973) has postulated that some intravacuolar osmiophilic material may be implicated in the growing process of the tonoplast and of the plasmalemma when the pollen tube begins to grow.…”

mentioning

confidence: 99%