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  • 1
    Electronic Resource
    Electronic Resource
    Response of leaf surfaces and gas exchange to wind stress and acid mist in birch (Betula pubescens) (1998)
    Springer
    Trees 13 (1998), S. 1-12 
    Details
    ISSN: 0931-1890
    Keywords: Key words Wind ; Acidic mist ; Foliar injury ; Cuticular integrity ; Gas exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  This research demonstrates that a leaf’s response to acid mist is dependent on the integrity of the leaf cuticle and that significant differences in the structural and physiological disturbances in leaves can be attributable to different types of wind action. Betula pubescens Ehrh. plants were located at adjacent, but contrasting, sites to create different wind treatments: (i) direct wind action, (ii) indirect wind action and (iii) shelter from wind action (control). In combination with the wind treatments, acidic (pHs 5 and 3) or neutral (pH 7) mists were applied weekly. Wind action significantly increased visible leaf injury, microscopic cuticular lesions and cuticular conductance (g c ), but reduced photosynthetic rate (P N ) and stomatal conductance (g s ) compared to shelter. Wind action combined with acid mist was more injurious than wind action alone, but leaves sheltered from wind action were highly resistant to the damaging effects of acid mist. Direct wind action combined with pH 3 mist resulted in the highest values of g c and the greatest number of cuticular lesions. By contrast, indirect wind action combined with pH 3 mist induced most visible injury, but relatively low values of g c and few microscopic cuticular lesions. Acid mist reduced P N only when leaves had been damaged by wind action. Higher values of g c were associated both with increases in the area of visible leaf injury and with the number of cuticular lesions. Compensatory increase in P N of healthy tissue was evident in leaves exposed to combinations of wind action and acid mist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009732
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of pre-severance light quality on the vegetative propagation of Eucalyptus grandis W. Hill ex Maiden (1996)
    Springer
    Trees 10 (1996), S. 317-324 
    Details
    ISSN: 0931-1890
    Keywords: Key words Carbohydrates ; Eucalyptus grandis ; Photosynthesis ; Propagation ; Red to far-red ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract  Two-leaf, two-node cuttings were taken from Eucalyptus grandis stockplants grown under different light qualities (red to far-red ratios of 0.4, 0.7, 1.3, 3.5 and 6.5) at a constant photon flux density (200 μmol m –  2 s –  1). Two experiments tested effects of pre-severance light quality on cutting morphology, post-severance gas exchange, carbohydrate status and rooting of cuttings. The best rooting percentage was achieved by cuttings with longer stems and greater stem volume from stockplants grown at lower red to far-red (R:FR) ratios. Generally, rooting success was associated with low pre-severance starch and water-soluble sugar concentrations, and a greater total water-soluble carbohydrate (TWSC) content per cutting. Rooting was associated with well maintained stem starch and an increase in stem TWSC during the propagation period. Gas exchange of cuttings was measured between 28 and 33 days after severance. Rooting percentages at 35 days after severance were positively and linearly related to net photosynthetic rate and stomatal conductance. In unrooted cuttings there was a net release of CO2 which increased significantly with an increase in pre-severance R:FR ratio. These results demonstrate that stockplant environment may significantly modify the morphology and physiology of subsequent cuttings, and that cutting morphology, and stored and current photosynthates have a significant influence on rooting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00009651
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of pre-severance light quality on the vegetative propagation ofEucalyptus grandis W. Hill ex Maiden (1996)
    Springer
    Trees 10 (1996), S. 317-324 
    Details
    ISSN: 1432-2285
    Keywords: Carbohydrates ; Eucalyptus grandis ; Photosynthesis ; Propagation ; Red to far-red ratio
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Two-leaf, two-node cuttings were taken fromEucalyptus grandis stockplants grown under different light qualities (red to far-red ratios of 0.4, 0.7, 1.3, 3.5 and 6.5) at a constant photon flux density (200 μmol m-2 s-1). Two experiments tested effects of pre-severance light quality on cutting morphology, post-severance gas exchange, carbohydrate status and rooting of cuttings. The best rooting percentage was achieved by cuttings with longer stems and greater stem volume from stockplants grown at lower red to far-red (R∶FR) ratios. Generally, rooting success was associated with low pre-severance starch and water-soluble sugar concentrations, and a greater total water-soluble carbohydrate (TWSC) content per cutting. Rooting was associated with well maintained stem starch and an increase in stem TWSC during the propagation period. Gas exchange of cuttings was measured between 28 and 33 days after severance. Rooting percentages at 35 days after severance were positively and linearly related to net photosynthetic rate and stomatal conductance. In unrooted cuttings there was a net release of CO2 which increased significantly with an increase in pre-severance R∶FR ratio. These results demonstrate that stockplant environment may significantly modify the morphology and physiology of subsequent cuttings, and that cutting morphology, and stored and current photosynthates have a significant influence on rooting.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02340778
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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