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  • Pinus elliottii  (2)
  • Gas exchanges  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The response of European beech (Fagus sylvatica L.) seedlings from two Italian populations to drought and recovery (1995)
    Springer
    Trees 9 (1995), S. 348-354 
    Details
    ISSN: 1432-2285
    Keywords: Chlorophyll content ; Fagus sylvatica ; Gas exchanges ; Hydraulic conductivity ; Relative fluorescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract The response of gas exchange, leaf chlorophyll content, relative fluorescence to decreasing water potential and recovery was followed in European beech seedlings from two Italian populations, differing in their native precipitation amounts. A population from Sicily (southern Italy) was selected as representative of a xeric population while a population from central Italy, Abetone, represented a mesic one. Dry-matter partitioning, leaf area, hydraulic sufficiency and xylem embolism were evaluated in both well-watered control plants as well as in plants subjected to drought. With the onset of water stress, values of water potential, leaf relative water content, net photosynthesis, leaf conductance and leaf chlorophyll concentration decreased concurrently while relative fluorescence remained unchanged. The population from Sicily showed a delay in effects of the imposed drought. Within 5 days of rewatering, leaf conductance was not fully recovered while all of the other parameters recovered to control levels, in both populations. Total, shoot, stem and root dry weight tended to be higher in seedlings from Abetone, even though both populations had similar photosynthetic rates. The population from Sicily exhibited about 3% greater (even if not significant) allocation to roots than the population from Abetone. Seedlings from Abetone had higher, but not significant, leaf specific conductivity and per cent loss in hydraulic conductivity than seedlings from Sicily. Drought resulted in a reduction of hydraulic conductivity and hydraulic sufficiency in seedlings from both populations. Photosynthesis of water stressed plants from both populations appeared to be reduced primarily by carbon dioxide diffusion through stomata and perhaps secondarily by changes in chlorophyll concentration rather than by efficiency of photosystem II. The effect of hydraulic factors on gas exchange during drought and recovery was not clearly evident.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202499
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Bud development and dormancy in slash and loblolly pine. II. Effects of ethephon applications (1988)
    Springer
    New forests 2 (1988), S. 269-274 
    Details
    ISSN: 1573-5095
    Keywords: Pinus elliottii ; Pinus taeda ; ethylene ; height growth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Ethephon application on four dates did not induce budset in slash and loblolly pine seedlings. Ethephon promoted slash pine budbreak by 11 days when applied in mid-November and delayed loblolly pine budbreak by 8 days when applied in late November. Mid-November and early February applications of ethephon promoted height growth of both species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027942
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  • 3
    Electronic Resource
    Electronic Resource
    Bud development and dormancy in slash and loblolly pine. I. Speed of budbreak and second year height as related to lifting date (1988)
    Springer
    New forests 2 (1988), S. 261-268 
    Details
    ISSN: 1573-5095
    Keywords: Pinus elliottii ; Pinus taeda ; survival
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Slash and loblolly pine 1-0 seedlings were lifted from the nurserybed in late November, mid-December, late December, and mid-February. The buds of the seedlings were classified as set or growing two weeks prior to lifting and were re-examined upon lifting. For both species, buds that had set remained set whereas those that were classified as growing showed an decreasing trend of setting from November through December. A subset of seedlings was potted and maintained in a greenhouse to determine rate of budbreak; the remainder were field planted. In the greenhouse, loblolly pine broke bud fastest and slowest when lifted in mid-February and mid-December, respectively. The rate of slash pine budbreak increased over successive lifting dates. In the field, loblolly pine lifted in mid-December exhibited the highest percentage of growing seedlings; these seedlings were also tallest after one year in the field. Field-planted slash pine had the highest percentage of growing seedlings when lifted in late November. However, seedlings lifted in mid-December were tallest after one year.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00027941
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    Paper (German National Licenses)
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