Chemical Documentation of Allopatric Introgression in Juniperus

Flake, Robert H.; Urbatsch, Lowell E.; Turner, B. L.

doi:10.2307/2418308

Cited by 32 publications

(18 citation statements)

References 14 publications

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“…Characters 1-6 are not shown as they are all highly correlated with character 7 and thus show the same pattern. This is in agreement with the previous report (Flake, Urbatsch and Turner, 1978). The correlations within J. horizontalis and J. scopulorum are shown in Fig.…”

Section: Association Of the Individuals From Banff With The J Scopulsupporting

confidence: 93%

A Comparison of Multivariate Methods for the Detection of Hybridization

Adams

1982

TAXON

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. International Association for Plant Taxonomy (IAPT)is collaborating with JSTOR to digitize, preserve and extend access to Taxon. SummaryPrincipal component analysis (PCA), Wells' hybrid distance diagram, principal coordinate analysis (PCO) using weighted Gower metrics, and canonical variate analysis (CVA) were compared using data from artificial crosses of sunfish (Lepomis) and putative hybridization in Juniperus. The results were similar between the two data sets in that using the weighted characters (F ratios from ANOVA of the parents) produced well resolved parental groups and generally ordinated the hybrids between the parents. The F weighted PCO and Wells' distance diagrams were found to be better suited for the analysis of hybridization than PCA or CVA. Several limitations of PCA and CVA are discussed.

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Section: Association Of the Individuals From Banff With The J Scopulsupporting

confidence: 93%

A Comparison of Multivariate Methods for the Detection of Hybridization

Adams

1982

TAXON

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“…§ R, = solar radiation, PAR = photosynthetically active radiation, Ta = air temperature, VPD = vapor pressure deficit, INTRODUCTION Eastern redcedar (Juniperus virginiana) is the most widely distributed tree-size conifer in the eastern half of the United States (Little 1971). Within its natural range, genetic races and introgressants exist, resulting in diverse phenotypes (von Rudloff 1975, Van Haverbeke and Read 1976, Flake et al 1978. It is considered intolerant of shade (Baker 1949, Ormsbee et al 1976) but is well adapted to a wide range of sites.…”

Section: Vpd Tmentioning

confidence: 99%

Ecophysiological Investigations of Understory Eastern Redcedar in Central Missouri

Lassoie¹,

Dougherty²,

Reich³

et al. 1983

Ecology

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Eastern redcedar (Juniperus virginiana) is a sun—adapted, drought—resistant pioneer species common to pastures, abandoned fields, fence rows, and calcareous rock outcrops throughout the eastern United States. However, it is also a frequent component of the understory in mature oak—hickory forests in central Missouri, where light levels are typically <10% of full sunlight during much of the growing season. This is below eastern redcedar's reported optimum for photosynthesis. The competitive survival of understory eastern redcedar under such environmental conditions was apparently due to it being an evergreen conifer in a deciduous forest. Hence, its foliage was able to maintain a positive carbon dioxide balance throughout much of the year, with maximum net photosynthetic rates occurring during periods when the overstory was leafless. The greatest daily average net photosynthetic rates (Phn) occurred during overstory leaf emergence when temperatures were moderate and light levels to the understory trees were annually the highest. Furthermore, since leaf temperatures and tree water deficits were relatively low at this time, daily gas exchange rates were not greatly limited by midday stomatal closure. After the overstory foliage had fully developed, understory light levels averaged °50—80% below levels observed in early spring. Thus, photosynthesis was severely light limited during the day, resulting in Ph?n that were °15—45% of the springtime maxima. The greatest daily average transpiration rates (TR) occurred during the summer due to the high evaporative demand. Increasing leaf temperatures and tree water deficits became more important by late summer, causing stomatal closure during some afternoons, which reduced Phn and TR to °30 and 40%, respectively, of the early summer levels. During the autumn, winter, and early spring, understory light levels were normally above the saturation point for photosynthesis. The light saturation point for an understory study tree (expressed as flux of photosynthetically active photons) was °800 @mmol°m—2°s—1, less than half of that reported for open—grown eastern redcedar. This relatively lower light saturation point suggested an adjustment to shade conditions. During the autumn overstory defoliation period, light levels to understory trees progressively increased, and Phn eventually reached 80% of the springtime maximum. In contrasts, TR only reached °25% of the summer maximum, owing to relatively low evaporative demands. During the late autumn and winter, low leaf and oil temperatures combined to limit gas exchange severely. The major controlling factors seemed to be cold air temperatures directly inhibiting Phn and cold soil temperatures indirectly producing tree water deficits due to reduced water uptake at the soil—rate interface. Such conditions promoted persistent stomatal closure, resulting in Phn near zero. However, a temporary warming trend during the winter caused an increase in Phn to a level °30% of the springtime maximum. Higher net photosynthetic rates probably were n...

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“…Fassett (1944), Hall (1952aHall ( , 1952b, Van Haverbeke (1968), Schurtz (1971), von Rudloff (1975, Flake et al (1978), Comer et al (1982), and Adams (1983) characterized the junipers in the Great Plains as a variable population attributable to introgressive hybridization, with a clinal transition throughout the region. Van Haverbeke (1968) identified a zone of intermediacy extending northeasterly through northeast Colorado, northwest Nebraska, and southwest South Dakota.…”

Section: Introductionmentioning

confidence: 99%

Genetic variation in Great Plains Juniperus

Haverbeke¹,

King²

1990

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Height growth was tallest and survival highest, at age 5, in Juniperus trees from seed sources of J. virginiana originating in the central Great Plains (east-central Nebraska, western Iowa, and east northcentral Kansas); and in trees from seed sources of J. scopulorum from northwest Nebraska and the High Plains (central to northeast Montana). Genotype x environment interaction in height was significant, but minimal in northern Great Plains plantations; it increased in the central plains plantations and primarily involved some southern sources. Agelage correlations indicated that selection of taller growing seed sources and taller trees within seed sources can be made at ages 2 and 5, respectively. Performance of Juniperus indicated an intermediate to broad adaptive mode.

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Chemical Documentation of Allopatric Introgression in Juniperus

Cited by 32 publications

References 14 publications

A Comparison of Multivariate Methods for the Detection of Hybridization

A Comparison of Multivariate Methods for the Detection of Hybridization

Ecophysiological Investigations of Understory Eastern Redcedar in Central Missouri

Genetic variation in Great Plains Juniperus

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