Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves

Noble, Reginald D.; Jensen, Keith F.

doi:10.1002/j.1537-2197.1980.tb07732.x

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…At the physiological level, net photosynthesis is reduced, dark respiration is increased (Barnes, 1972), and C transport to roots is lowered (McLaughlin and McConathy, 1983). Other physiological impacts include coincident and long-term reductions in stomata1 conductance (Hill and Littlefield, 1969;Reich and Amundson, 1985;Coyne and Bingham, 1982), accelerated leaf senescence (Reich, 1983;Jensen, 1982;Noble and Jensen, 1980;Reich and Lassoie, 1985), reduced root/shoot ratio (Hogsett et al, 1985a;Chappelka and Chevone, 1986), and increased foliar leaching (Rehfuess et al, 1982).…”

Section: Types Of Response Measuresmentioning

confidence: 99%

Impact of Ozone on the Growth and Yield of Trees: A Review

1988

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Data from 25 experiments on seedlings of 43 tree species and hybrids show that ozone (0,) can reduce growth and photosynthesis at concentrations common in many areas of the USA. Seedlings have been primarily employed for such studies for logislic reasons, and will likely provide the greatest breadth of information for some time IO come. However, a number of impediments limit application of seedling response studies IO assessment of impacts on regional timber production. Large trees differ from seedlings in a number of ways, including C allocation and canopy structure, and methods must be developed IO acrount for these differences if information from seedling studies is to prove useful IO forest impact assessmenl.Understanding how competition mediates individual tree responses will require investigation of whether systematic differences of microclimate leaf morphology that exist across canopies affects foliage sensitivity IO 0,. and whether the maximum growth rates of genolypes are correlated with susceptibility IO 0,. Definitive information on these factors is necessary IO assess imparts of 0, on stand development and diameter distributions in both mulli-and single species stands. Of critical economic importance is whether 0, preferentially damages taller, more valuable individuals within stands and more valuable, faster growing stand types.

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Section: Types Of Response Measuresmentioning

confidence: 99%

Impact of Ozone on the Growth and Yield of Trees: A Review

1988

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“…Many experiments bave indicated tbat tbe leaves are most sensitive to ozone wben tbey bave just reacbed full size (e.g. Ricb, 1964;Noble & Jensen, 1980). In conifers, tbe greatest ozone sensitivity of current year needles bas been reported to occur several weeks after budbreak, from late spring to early summer (Davis & Wood;1972;Davis & CoppoHno, 1974).…”

Section: Introdl^ctionmentioning

confidence: 99%

The ozone sensitivity of birch (Betula pendula) in relation to the developmental stage of leaves

et al. 1996

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St;MMARYClonal birch (Betula peiidula Roth.) seedlings at three different de\ elopmental stages were fumigated for 12 h daily with 50, 90 and 1 30 ppb ozone for 25 d. When transferred to fumigation chambers, the leaves of plant group 1 were almost expanded, in group 2 they were fast enlarging, and in group 3 all the leaves emerged under the exposure. The plants in which the lea\es emerged under the ozone stress were the most resistant to ozone. In groups 1 and 2 ozone treatments reduced the growth of leaf biomass. and induced more visible injuries on leaves and ultrastructural symptoms in chloroplasts than they did in group 3. The stomatai densjt> of leaves increased in response to ozone in all the groups, Tbe effects of ozone on stomatal conductance were complex. In groups 1 and 2 the 50 ppb ozone exposure increased stomatal conductance whereas lowered conductances were observed in group 3 after fumigation with 90 and 130 ppb ozone. The results suggest that the leaves developing under ozone fumigation were better able to tolerate tbe ozone stress, as indicated by unaffected or stimulated growtb and small amounts of \-isible and ultrastructural injuries and stomatal cbanges. It is possible to regard the changes as acclimation reactions.

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“…Noble & Jensen (1980) found that leaves of P. deltoides x trichocarpa appeared sensitive to ozone just prior to attaining their full size, with the result that the growth period was effectively truncated. However, the doses of ozone used in their study were high (250 nil"', 12 h d~') and investigations of the effects of fumigations at more realistic concentrations to not appear to have been attempted.…”

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confidence: 99%

Biophysics of leaf growth of hybrid poplar: impact of ozone

1991

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SUMMARYBiophysical parameters controlling leaf expansion in hybrid poplar (Populus nigra L. x P. deltoides Bartr. ex Marsh = P. X euramericana) were measured for first-year cuttings growing under controlled conditions, with or without ozone fumigation. As individual leaves expanded, leaf water potential remained constant whilst solute potential declined and turgor (P) increased from approximately O' S MPa to over 1-0 MPa as leaf size increased. Yield turgor (Y) measured by stress-relaxation of leaf discs within psychrometers, increased from approximately 0-2 MPa to over 1-0 MPa during the same period. As the value of Y approached that of P, the effective turgor for grovrth (P-Y) declined and became zero as leaf growth ceased.Cell wall extensibility (measured as percentage plasticity by the ' Instron' technique) was related to leaf growth rate such that highest values of plasticity corresponded to maximum rates of growth. As growth ceased, wall extensibility declined to very low values.Fumigation with 50 nl 1"' ozone for 16 h d"^ had no effect on any of the measured parameters with the result that growth and mature leaf size were unaffected by comparison with control plants receiving charcoal-filtered air. Additional episodes of 120 nl ]"' ozone on three consecutive days during the period of maximum leaf growth similarly had no effect on expansion or final leaf size.

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Effects of Sulfur Dioxide and Ozone on Growth of Hybrid Poplar Leaves

Cited by 11 publications

References 11 publications

Impact of Ozone on the Growth and Yield of Trees: A Review

Impact of Ozone on the Growth and Yield of Trees: A Review

The ozone sensitivity of birch (Betula pendula) in relation to the developmental stage of leaves

Biophysics of leaf growth of hybrid poplar: impact of ozone

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