Microsporogenesis, Pollination, Pollen Germination and Male Gametophyte Development in Taxus brevifolia

Anderson, Erika D.; Owens, John N.

doi:10.1006/anbo.2000.1274

Cited by 26 publications

(19 citation statements)

References 34 publications

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“…For instance, in Cephalotaxus, 21 Cupressus, 22 and Podocarpus, 23 the breakdown products are transferred to the PD after degeneration of the nucellus cells, while only the uppermost layer of nucellus cells break down in Sequoiadendron 19 and Phyllocladus. 22 Moreover, PDs are produced without nucellus degeneration in Cedrus, 9 Taxus, 24 Larix, 25 and Pseudotsuga. 26 In the present study, we found that many cells with typical secretion characteristics were located at the tip of the nucellus and inner integument during the pollination stage in Ginkgo.…”

Section: Discussionmentioning

confidence: 99%

“…3 For example, the PD can persist for several weeks in other species, e.g., Taxusbrevifolia and Juniperus communis. 24,31 In the Cupressaceae, Taxodiaceae, Cephalotaxaceae, and Taxaceae, it can be secreted at night but withdraw during daytime in a repeating cycle. 2 In our studies, the PD of G. biloba lasted for approximately 7 d under experimental conditions (25°C, approx.…”

Section: Plantmentioning

confidence: 99%

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The behavior of pollination drop secretion in Ginkgo biloba L.

Jin

Jiang

Wang

et al. 2012

Plant Signaling & Behavior

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Pollination drop (PD) secretion plays a critical role in wind pollination in many gymnosperms. We conducted detailed investigations on PD secretion in Ginkgo biloba, and found that PDs could not form when the micropyle was removed, but were able to form after removal of the shoot, leaves, ovular stalk, or ovular collar. The duration and volume of the PD increased under high relative humidity, but addition of salt or sugar did not affect PD secretion, its size, or its duration. Morphological and anatomical observations showed that many secretion cells at the nucellus tip contributed to secreting the PD after the formation of pollen chamber. Under laboratory conditions, the PD persisted for approximately 10 d if not pollinated, and re-formed five times after it was removed, with the total volume of PDs reaching approximately 0.4 μL. These results suggested that PDs can be continuously secreted by the tip of the nucellus cells during the pollination stage to increase the chance of capturing pollen from the air. Importantly, PD secretion is an independent behavior of the ovule and PDs were produced apoplastically.

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Section: Discussionmentioning

confidence: 99%

Section: Plantmentioning

confidence: 99%

The behavior of pollination drop secretion in Ginkgo biloba L.

Jin

Jiang

Wang

et al. 2012

Plant Signaling & Behavior

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“…In culture, pollen germination occurs after 1 or 2 days in Thuja plicata (Colangeli and Owens 1990a), Tsuga heterophylla (Colangeli and Owens 1990b), Picea glauca (Dawkins and Owens 1993), Larix occidentalis , Pseudotsuga menziesii (Webber and Painter 1996;Fernando et al 1997), Taxus brevifolia (Anderson and Owens 2000), Chamaecyparis nootkatensis (Anderson et al 2002), Abies amabilis (Chandler and Owens 2004), and Pinus contorta (Owens et al 2005). Although pollen germination in conifers is slow, they are generally easy to germinate in vitro and a very high germination percentage has been reported in various groups especially in Pinus.…”

Section: Pollen Tube Growth and Development In Vitromentioning

confidence: 97%

“…During pollen tube growth, the generative cell divides to form two sperm nuclei that remain closely associated with the organelles from the generative cell but are not separated by a cell membrane or wall ( Fig. 6b) (Anderson and Owens 2000). c. In the Pinaceae, before the pollen is shed, the microspore divides unequally to form a first small prothallial cell and a large embryonal cell.…”

Section: Male Gametophyte Development In Relation To Pollen Tube Formmentioning

confidence: 98%

Growth and development of conifer pollen tubes

2005

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Conifer pollen tubes are an important but underused experimental system in plant biology. They represent a major evolutionary step in male gametophyte development as an intermediate form between the haustorial pollen tubes of cycads and Ginkgo and the structurally reduced and faster growing pollen tubes of flowering plants. Conifer pollen grains are available in large quantities, most can be stored for several years, and they grow very well in culture. The study of pollen tube growth and development furthers our understanding of conifer reproduction and contributes towards our ability to improve on their productivity. This review covers taxonomy and morphology to cell, developmental, and molecular biology. It explores recent advances in research on conifer pollen and pollen tubes in vivo, focusing on pollen wall structure, male gametophyte development within the pollen wall, pollination mechanisms, pollen tube growth and development, and programmed cell death. It also explores recent research in vitro, including the cellular mechanisms underlying pollen tube elongation, in vitro fertilization, genetic transformation and gene expression, and pine pollen tube proteomics. With the ongoing sequencing of the Pinus taeda genome in several labs, we expect the use of conifer pollen tubes as an experimental system to increase in the next decade.

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“…The pollen is subsequently drawn into the micropyle as the drop recedes (e.g. Taxus - Anderson and Owens 2000). A less direct method of pollen capture occurs when pollen reaches the megasporangiate strobilus (female cone), sifts to the base of an ovuliferous scale, and adheres to outgrowths of the integument.…”

Section: Introductionmentioning

confidence: 99%

Postpollination drop production in hybrid larch is not related to the diurnal pattern of xylem water potential

O’Leary

Aderkas

2005

Trees

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The hourly production of postpollination drops in the ovules of three hybrid larch trees (Larix x marschlinsii Coaz) was examined and compared with the measured diurnal pattern of xylem water potential of the same trees under non-stressed conditions during two reproductive seasons. There was no consistent relationship between xylem water potential and ovular drop production in hybrid larch. Individual trees that showed a diurnal drop production in one year did not follow a similar pattern the other year. One tree produced drops in over half of its ovules hourly, regardless of the measured xylem water potential. Variation in number of drops produced per ovule and drop mass was observed between the three trees both years, and between years for two of the trees. This variation was not in response to xylem water potential or environmental conditions. Here we report the first simultaneous measurements of branch water status and the production of ovular secretions for any conifer. We conclude that the postpollination drop production of hybrid larch is not regulated by a tree's overall water status, but is under the control of localized structures such as the cone or the ovule.

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Microsporogenesis, Pollination, Pollen Germination and Male Gametophyte Development in Taxus brevifolia

Cited by 26 publications

References 34 publications

The behavior of pollination drop secretion in Ginkgo biloba L.

The behavior of pollination drop secretion in Ginkgo biloba L.

Growth and development of conifer pollen tubes

Postpollination drop production in hybrid larch is not related to the diurnal pattern of xylem water potential

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