Chlorophyll Fluorescence and Needle Chlorophyll Concentration of Fir (Abies sp.) Seedlings in Response to pH

Cregg, Bert M.; Duck, M. W.; Rı́os, Camilo; Rowe, D. Bradley; Koelling, M.R.

doi:10.21273/hortsci.39.5.1121

Cited by 13 publications

(10 citation statements)

References 18 publications

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“…Thus we conclude that irrigation with high‐pH (8.4) bore water is rendering Mn plant‐unavailable in soil solution, probably due to precipitation as oxides and/or carbonates (Epstein & Bloom 2005) and that Mn deficiency may be contributing to the decline of E. marginata and C. calophylla within the botanic garden of Kings Park. Mn deficiency may be contributing to the significantly lower rates of photosynthesis of parkland E. marginata relative to bushland E. marginata , during the wet spring 2003 and winter 2004 seasons, given the link between Mn deficiency and decreased photosynthetic performance (Cregg et al. 2004).…”

Section: Discussionmentioning

confidence: 99%

Ecophysiology of Eucalyptus marginata and Corymbia calophylla in decline in an urban parkland

Grigg

Lambers

et al. 2009

Austral Ecology

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Eucalypt trees are in decline throughout urban landscapes of south western Australia. This study investigated the cause of decline in Eucalyptus marginata and Corymbia calophylla trees in parkland and compared water and nutrient relations with healthy trees in adjacent bushland in Perth,Western Australia. It was hypothesized that: (i) trees were drought stressed through competition for soil water by the vigorous turf; (ii) excessive uptake of nitrogen, because of fertilizer application to turf, caused toxicity; and/or (iii) micronutrient (Cu, Fe, Mn and/or Zn) deficit was induced by high-pH irrigation water applied to turf around parkland trees. Leaf water potential showed aseasonal variation in the irrigated parkland trees and foliar d 13 C indicated that parkland trees generally had low water-use efficiency and were not drought stressed relative to bushland trees. Foliar N levels were not significantly different between parkland and bushland trees indicating that excess N uptake was not a factor in the decline. Foliar total Fe, 'metabolically active' Fe, Cu and Zn concentrations were not significantly different between parkland and bushland trees. Foliar manganese concentrations were indicative of deficiency and significantly lower in parkland trees (5-14 mg g -1 ) relative to bushland trees (22-35 mg g -1 ). It is concluded that application of alkaline irrigation water to the parkland site reduced the plant-availability of Mn; however, our study of only one parkland site does not allow us to generalize the results across other parklands. Fig. 2. Predawn (a,b) and midday (c,d) leaf water potential (MPa) of Corymbia calophylla and Eucalyptus marginata in parkland (park) and native bushland (bush). Error bars are standard errors of the mean. Asterisks denote a significant difference using Tukey post hoc tests between parkland and bushland trees at P = 0.05 level. EUCALYPT DECLINE IN PARKLAND 503

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Section: Discussionmentioning

confidence: 99%

Ecophysiology of Eucalyptus marginata and Corymbia calophylla in decline in an urban parkland

Grigg

Lambers

et al. 2009

Austral Ecology

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“…Increasing soil pH in A. alba led to Mn defi ciencies and needle chlorosis ultimately resulting in tree decline (Hiltbrunner and Flückiger, 1996). In several Abies species, photosynthetic effi ciency and foliar Mn, B, K, Zn, and Cu levels declined with increased soil pH levels (Cregg et al, 2004). Decreasing levels of these nutrients were also strongly correlated with a decreased variable fl uorescence to maximum fl uorescence (F v /F m ) ratio and decreased chlorophyll concentration in the needles.…”

Section: Soil Nutritionmentioning

confidence: 99%

Screening Exotic Firs for the Midwestern United States: Interspecific Variation in Adaptive Traits

Jones¹,

Cregg²

2006

HortSci

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Conifers represent a sizeable portion of nursery and landscape sales in the upper midwestern U.S. Several conifer species have been overplanted to the point where disease problems and insect pressures have developed. Although more than 40 true fir (Abies Mill.) exist throughout the northern hemisphere, use of firs in the landscape and Christmas tree industry has been limited to relatively few species. This is largely due to perceived intolerance of many site conditions. However, recent research suggests Abies are more tolerant of varying site conditions than originally thought. Successful introduction of new exotic fir species for landscape use will require a systematic approach to identify species that are adapted to environmental stresses. In this article we review the extent and nature of inter-specific variation among Abies species in traits commonly associated with tolerance of stresses found in the upper midwestern U.S. Specifically, we focus on cold hardiness, budbreak, photosynthetic gas exchange and water relations, and response to soil pH. It is important to match plants possessing necessary adaptive characteristics with the existing site conditions. Therefore, multiple screening factors should be met when identifying species or trees from different provenances for future introduction.

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“…Expanded use of Abies in landscapes has been limited by their perceived intolerance of many site conditions. However, Abies may be more tolerant of environmental conditions than originally thought as species differ in their response to soil pH (Cregg et al, 2004), drought (Guehl et al, 1991), and freezing temperatures (Sakai, 1982). Collectively, Abies cover large elevational and latitudinal ranges (Liu, 1971).…”

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confidence: 99%

Budbreak and Winter Injury in Exotic Firs

Jones¹,

Cregg²

2006

HortSci

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Seventeen Abies species were evaluated for budbreak and frost injury at four locations in Michigan. Freeze tests were conducted on four species growing at the Horticulture Teaching and Research Center to determine cold hardiness levels during winter. Species differed (P ≤ 0.0001) in their days to budbreak at all locations. Trees that had broken bud were more prone to late spring frost damage than trees yet to break bud. Species differed in chlorophyll fluorescence, bud damage, and needle damage after exposure to –44 °C. Bud, foliar, and cambium damage were correlated with chlorophyll fluorescence following freeze tests. Budbreak and midwinter cold hardiness were correlated. Species breaking bud earlier displayed greater midwinter cold hardiness than species breaking bud later. Selection criteria for future Abies introductions to the upper midwestern U.S. should include identifying species with late budbreak to reduce risk of late frost injury.

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Chlorophyll Fluorescence and Needle Chlorophyll Concentration of Fir (Abies sp.) Seedlings in Response to pH

Cited by 13 publications

References 18 publications

Ecophysiology of Eucalyptus marginata and Corymbia calophylla in decline in an urban parkland

Ecophysiology of Eucalyptus marginata and Corymbia calophylla in decline in an urban parkland

Screening Exotic Firs for the Midwestern United States: Interspecific Variation in Adaptive Traits

Budbreak and Winter Injury in Exotic Firs

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