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Titolo:
Effects of elevated ozone and low light on diurnal and seasonal carbon gain in sugar maple
Autore:
Topa, MA; Vanderklein, DW; Corbin, A;
Indirizzi:
Cornell Univ, Boyce Thompson Inst Plant Res, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 son Inst Plant Res, Ithaca, NY 14853 USA Montclair State Univ, Dept Biol & Mol Biol, Montclair, NJ 07043 USA Montclair State Univ Montclair NJ USA 07043 Biol, Montclair, NJ 07043 USA
Titolo Testata:
PLANT CELL AND ENVIRONMENT
fascicolo: 7, volume: 24, anno: 2001,
pagine: 663 - 677
SICI:
0140-7791(200107)24:7<663:EOEOAL>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
BEECH FAGUS-SYLVATICA; RED OAK SEEDLINGS; PINUS-TAEDA L; NET PHOTOSYNTHESIS; ACIDIC PRECIPITATION; TROPOSPHERIC OZONE; SHADE TOLERANCE; HYBRID POPLAR; NORWAY SPRUCE; AIR-POLLUTION;
Keywords:
Acer saccharum Marsh; diurnal starch accumulation; net photosynthesis; variable light;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
56
Recensione:
Indirizzi per estratti:
Indirizzo: Topa, MA Cornell Univ, Boyce Thompson Inst Plant Res, Tower Rd, Ithaca, NY14853 USA Cornell Univ Tower Rd Ithaca NY USA 14853 d, Ithaca, NY 14853 USA
Citazione:
M.A. Topa et al., "Effects of elevated ozone and low light on diurnal and seasonal carbon gain in sugar maple", PL CELL ENV, 24(7), 2001, pp. 663-677

Abstract

The long-term interactive effects of ozone and light on whole-tree carbon balance of sugar maple (Acer saccharum Marsh,) seedlings were examined, with an emphasis on carbon acquisition, foliar partitioning into starch and soluble sugars, and allocation to growth. Sugar maple seedlings were fumigated with ambient, 1.7 x ambient and 3.0 x ambient ozone in open-top chambers for 3 years under low and high light (15 and 35% full sunlight, respectively),Three years of ozone fumigation reduced the total biomass of seedlings in the low- and high-light treatments by 64 and 41%, respectively, but had no effect on whole-plant biomass allocation. Ozone had no effect on net photosynthesis until late in the growing season, with low-light seedlings generally exhibiting more pronounced reductions in photosynthesis. The late-season reduction in photosynthesis was not due to impaired stomatal function, but was associated more with accelerated senescence or senescence-like injury. In contrast, the 3.0 x ambient ozone treatment immediately reduced diurnal starch accumulation in leaves by over 50% and increased partitioning of total non-structural carbohydrates into soluble sugars, suggesting that injury repair processes may be maintaining photosynthesis in late spring and early summer at the expense of storage carbon. The results in the present study indicate that changes in leaf-level photosynthesis may not accurately predict the growth response of sugar maple to ozone in different light environments. The larger reduction in seedling growth under low-light conditionssuggests that seedlings in gap or closed-canopy environments are more susceptible to ozone than those in a clearing. Similarly, understanding the effects of tropospheric ozone on net carbon gain of a mature tree will requirescaling of leaf-level responses to heterogeneous light environments, wheresome leaves may be more susceptible than others.

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Documento generato il 27/09/20 alle ore 00:29:15