Conifer Reproductive Biology

Williams, Claire G.

doi:10.1007/978-1-4020-9602-0

Cited by 103 publications

(76 citation statements)

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“…Sequoiadendron giganteum probably fits this model, but we have been unable to find specific information in the literature (Weatherspoon 1990;Williams 2009;citations in Schmid and Schmid 2012). The parent redwood at Lake Fulmor has sparse cone production.…”

Section: Volume 30 Numbermentioning

confidence: 72%

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Sequoiadendron giganteum (Cupressaceae) at Lake Fulmor, Riverside County, California

Schmid¹

2013

aliso

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A GPS census made on 19 Jun 2012 of the Lake Fulmor area, northwestern San Jacinto Mountains, Riverside County, California, revealed seven trees of the Sierra Nevada endemic Sequoiadendron giganteum (Cupressaceae). The trees occur in a 234-meter-long narrow strip along the northwestern side of the lake. The population appears to be naturalizing. The largest tree (45 cm DBH, about 20 m tall), planted in 1980, is reproductively mature. Its six offspring to the northeast and southwest are 3-5 m tall and do not presently bear cones.

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Section: Volume 30 Numbermentioning

confidence: 72%

“…Conifers are wind pollinated and generally outcrossing; selfing may occur but can be avoided by various means (Williams 2009). Sequoiadendron giganteum probably fits this model, but we have been unable to find specific information in the literature (Weatherspoon 1990;Williams 2009;citations in Schmid and Schmid 2012).…”

Section: Volume 30 Numbermentioning

confidence: 99%

Sequoiadendron giganteum (Cupressaceae) at Lake Fulmor, Riverside County, California

Schmid¹

2013

aliso

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“…Only macro-climate data were collected to compare with capturing the pollen grain. It only appears between 02:00 and 04:00 in P. taeda (Williams 2009). the micro-and macro-climate data collected at Karatara. This data, together with the Karatara field data were used to develop three circadian climatic models, simulating temperature, RH and DP fluctuations, for Sabie (average of Tweefontein, Spitskop and Witklip), Karatara micro-(Kmic) and Karatara macro-climate (Kmac).…”

Section: Environmental Conditions Of Pollination Bagsmentioning

confidence: 99%

Climate as possible reproductive barrier in Pinus radiata (D. Don) interspecific hybridisation

et al. 2017

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Abstract. Historically, interspecific hybridisation with Pinus radiata D. Don had limited success. The effect of environmental conditions and position of pollination bags in the tree were investigated as possible hybridisation barriers. The study was conducted in a P. radiata seed orchard in the Southern Cape (South Africa). Field data were compared to the climatic conditions at natural and commercial provenances of seven Mesoamerican Pinus species identified as possible hybrid partners. In vitro pollen studies were used to confirm whether interspecific crosses with P. radiata might be feasible within predefined climatic parameters. The temperature ranges for both top and northern side of P. radiata pine trees in the seed orchard was similar to the natural distribution of P. radiata, P. elliottii Engelm. and P. taeda L. in the USA. Results suggested that pollen of P. elliottii and P. taeda might be more suited to result in the successful pollination of P. radiata than the other Mesoamerican pine species tested in this study. Furthermore, the combination of minimum temperature and precipitation also showed a closer correlation to successful hybridisation with P. radiata for both P. elliotii and P. taeda. However, pollen tube elongation studies did not support these results, suggesting that mean temperature might not be the only determining factor of hybridisation success. Three circadian temperature models that mimic natural conditions were developed for Karatara and Sabie (Tweefontein, Witklip and Spitskop). These models will be tested in future in vitro studies to further evaluate temperature fluctuations between day and night regimes as a possible reproductive barrier limiting hybridisation success between P. radiata and other Mesoamerican pine species.

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“…Empty seeds were defined as fully formed, normal-appearing seeds either (1) devoid of tissues or (2) containing evidence of small, abnormally developed female gametophytes or aborted embryos. Empty seeds were assumed to be the result of self-fertilization, which initiates the continuous degeneration of embryo and gametophyte tissues until the original contents of the seed are barely or no longer visible (Smith et al 1988, Rajora et al 2002, Williams 2009). Mean fresh individual seed mass was determined for each stand by bulk measurement of three replicates of 25 sound seed.…”

Section: Seed Characteristicsmentioning

confidence: 99%

Effects of structural retention harvesting on seed production and seed characteristics of old-growth eastern white pine (Pinus strobus L.) stands in northern Ontario

Parker¹,

Noland²,

Brown³

2010

The Forestry Chronicle

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Seed production and seed characteristics were examined during a mast seeding year in unmanaged, old-growth eastern white pine (Pinus strobus L.) stands located in northeastern Ontario and compared with those in adjacent stands partially harvested 16 years earlier using a structural retention system. Seed yields from old-growth stands were comparable to those of mature, second growth white pine stands but seed production assessed relative to unit area (# ha -1 ) and pine basal area (# m -2 ) was lower in partially harvested stands. In both unmanaged and harvested stands, seed production rate of trees growing in localized areas of lower pine basal area was higher. Seed characteristics and seed viability did not differ between harvest treatments. Although structural retention harvesting reduced seed production, results suggest that supply and viability of seed are unlikely to limit seedling recruitment in managed or protected old-growth white pine forests.Key words: germination, old-growth forest, partial harvest, seed mass, seed production RÉSUMÉ La production de semence et les caractéristiques des graines ont été étudiées au cours d'une année semencière dans de vieux peuplements non aménagés de pin blanc de l' est (Pinus strobus L.) situés dans le nord-est de l'Ontario et ont été comparées avec celles de peuplements adjacents partiellement récoltés 16 années auparavant faisant partie d'un système de rétention de la structure. Les quantités de graines des vieux peuplements étaient comparables à celles des pinèdes blanches à maturité issues de seconde venue, mais la production de semence évaluée en fonction de l'unité de superficie ((# ha -1 ) et de la surface terrière des pins (#m -2 ) était inférieure dans les peuplements partiellement exploités. Tant pour les peuplements non aménagés que pour les peuplements exploités, le taux de production de semence des arbres croissants dans des zones localisées de surface terrière inférieure était plus important. Même si la récolte avec rétention de la structure a réduit la production de semence, les résultats laissent entendre que l'approvisionnement et la viabilité des graines ne devraient pas limiter l' émergence de semis ni dans les pinèdes blanches aménagées ni dans les vieilles pinèdes protégées.

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Conifer Reproductive Biology

Cited by 103 publications

References 0 publications

Sequoiadendron giganteum (Cupressaceae) at Lake Fulmor, Riverside County, California

Sequoiadendron giganteum (Cupressaceae) at Lake Fulmor, Riverside County, California

Climate as possible reproductive barrier in Pinus radiata (D. Don) interspecific hybridisation

Effects of structural retention harvesting on seed production and seed characteristics of old-growth eastern white pine (Pinus strobus L.) stands in northern Ontario

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