Periodicity in Shoot Elongation Among Populations of Pinus contorta from the Northern Rocky Mountains

Rehfeldt, Gerald E.; Wykoff, William R.

doi:10.1093/oxfordjournals.aob.a086135

Cited by 43 publications

(24 citation statements)

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“…This also suggests that the root/shoot ratio in seedlings alone indicates adaptation to water stress. Rehfildt and Wycoff (1981) reported that the Pinus seedlings raised from different provenance often display different pattern of root, stem and leaf growth as observed in this study also. These variations in growth characteristics of different Dalbergia sissoo provenance may be attributed to adaptation because the seedlings from all the sources were raised under identical conditions (Singh and Pokhriyal, 2000).…”

Section: Discussionsupporting

confidence: 72%

Variation in Seed and Seedling Traits among Fifteen Chinese Provenances of Magnolia officinalis

Xiao

Yang

2012

Not Bot Hort Agrobot Cluj

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Magnolia officinalis seeds were collected from 15 different provenances, ranging from 336 to 1387 m in China. The main objective of this study was to identify germplasm resources of M. officinalis by test seed traits, seed germination, seedling traits, and seedling growth rate. There are significant differences among provenances in all studied attributes except relative growth rate and the net assimilation rate. Seed weight exhibited maximum variation among provenances in seed morphometric traits with a significant positive correlation in terms of average annual temperature and average annual rainfall, and negative correlation with latitude of seed origin. Overall average seed germination in nursery was 59.4% varying from 26.6% to 91.2%. Seedling height decreased by geographical latitude gradually from south to north, while stem diameter declines from east to west. That means the geographic variation of the plant at the seedling stage manifests a two-way variation with the latitude and longitude. Seed of Longsheng, Yangxian, Jingning, Wuyishan, Kaixian and Ningqiang provenance have been identified suitable to produce quality seedlings. It can be concluded that the observed patterns of variation will have implications for genetic resources conservation and tree improvement.

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Section: Discussionsupporting

confidence: 72%

Variation in Seed and Seedling Traits among Fifteen Chinese Provenances of Magnolia officinalis

Xiao

Yang

2012

Not Bot Hort Agrobot Cluj

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“…during all stages of measurements. The seedlings of different provenances, when grown under common nursery environmental conditions, often displayed different patterns of shoot growth (Dormling, 1979;Rehfeldt & Wycoff, 1981). However, it is not always easy to show that such differences are adaptive, presumably in response to the environment of the parent seed origin.…”

Section: Resultsmentioning

confidence: 99%

Environmental Variation in Seed and Seedling Characteristics of Pinus Roxburghii Sarg. From Uttarakhand, India

Ghildiyal¹,

Sharma²,

Gairola³

2009

Appl Ecol Env Res

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Abstract. The present study was undertaken to assess the environmental variation in seed characters and to explore the efficacy of hydrogen peroxide treatment on the germination and seedling traits of sixteen provenances of Pinus roxburghii from Uttarakhand Himalaya. Provenances, which had higher values for seed parameters showed better germination. Soaking the seeds for 24 hours in a solution of H2O2 (1% v/v) had a significant effect on the rate of germination and average germination percentage. About 88.5 % of mean average germination was revealed by the seeds that were treated with H2O2 as compared to the untreated (control) seeds (77.4 %). Simultaneously, H2O2 treatment also caused an appreciable decrease, in shortening of germination period by 10 days. Results have shown that the soaking of chir-pine seeds in H2O2 (1% v/v) for 24 hours is highly beneficial and therefore for large scale germination, treatment of H2O2 should be preferred. The germination percentage of seeds was found to be positively correlated with altitude and negatively correlated with rainfall.

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“…The early developmental research for studies in conifer genecology was carried out by Campbell (1974aCampbell ( , b, 1979Campbell ( , 1987Campbell ( , 1991 in Oregon and Washington and by Rehfeldt and Wykoff (1981) in the northern Rocky Mountains. Sample areas for these studies were usually intermediate in size, perhaps equivalent to the area included within 1 to 3 national forests (1 to 2 degrees range in latitude and longitude) (Rehfeldt 1990(Rehfeldt , 1994aSorensen 1992;Sorensen and Weber 1994), but narrower studies have focused on single watersheds (Campbell 1979) and single coastal islands (Campbell and others 1989).…”

Section: Short-term Common-garden Studiesmentioning

confidence: 99%

Pacific Northwest Forest Tree Seed Zones: A Template for Native Plants?

Johnson¹,

Sorensen²,

Clair³

et al. 2004

Native Plants Journal

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Seed movement guidelines for restoration activities are lacking for most native grasses, forbs, and shrubs. The forestry community has decades of experience in establishing seed zones and seed movement guidelines that may be of value to restoration managers. We review the history of seed zone development in forest trees, with emphasis on the Pacific Northwest, and make some suggestions concerning seed transfer guidelines for other native plants. K E Y W O R D Sseed movement, genetic variation, adaptation ITIS (2002)he forestry community has been restoring, replanting, and reforesting lands with native tree species for decades in North America and for centuries in Europe. This work and early provenance tests show large amounts of source-related genetic variation within species for traits that are associated with adaptation, such as growth traits, cold hardiness, and phenology. As a consequence, the forestry community in the US Pacific Northwest (Oregon and Washington) initiated forest tree seed certification and a system of seed zones in the 1960s. These seed zones have been modified over time to incorporate new research information. Although adaptive variation in forest trees is usually continuous across the landscape, zones with distinct boundaries generally have been used to control seed use for administrative reasons. A seed zone is a mapped area with fixed boundaries in which seeds or plant materials can be transferred with minimal risk of maladaptation and, this is important in forestry, with minimal risk of a loss in productivity. Continuous zones, or seed transfer guidelines, are similar in that they recommend how far seeds can be transferred from point of origin, and describe the relative risk associated with that transfer.

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Periodicity in Shoot Elongation Among Populations of Pinus contorta from the Northern Rocky Mountains

Cited by 43 publications

References 1 publication

Variation in Seed and Seedling Traits among Fifteen Chinese Provenances of Magnolia officinalis

Variation in Seed and Seedling Traits among Fifteen Chinese Provenances of Magnolia officinalis

Environmental Variation in Seed and Seedling Characteristics of Pinus Roxburghii Sarg. From Uttarakhand, India

Pacific Northwest Forest Tree Seed Zones: A Template for Native Plants?

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