Chronic ozone exposure alters the growth of leaves, stems and roots of hybrid Populus

Woodbury, Peter B.; Laurence, J.A.; Hudler, George W.

doi:10.1016/0269-7491(94)90243-7

Cited by 33 publications

(16 citation statements)

References 19 publications

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“…The increased A in the O 3 -and CO 2 +O 3 -exposed plants of clone 259 may be an acclimation response compensating for decreased photosynthetic rates under O 3 stress. This hypothesis finds support in the works of Woodbury et al (1994) and Pääkkönen et al (1996a), who showed that plants exposed to chronic oxidative stress may preferentially invest in new foliage, and of Catovsky and Bazzaz (2000), who showed that such an increase in A could compensate for decreased photosynthetic rates. The greater O 3 -induced increase in LAR at elevated than at ambient CO 2 suggests that the two gases may have interactive effects on biomass allocation between foliage and stem.…”

Section: Resultsmentioning

confidence: 63%

The effect of elevated carbon dioxide and ozone on leaf- and branch-level photosynthesis and potential plant-level carbon gain in aspen

Noormets

McDonald

Dickson

et al. 2001

Trees

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Two aspen (Populus tremuloides Michx.) clones, differing in O 3 tolerance, were grown in a freeair CO 2 enrichment (FACE) facility near Rhinelander, Wisconsin, and exposed to ambient air, elevated CO 2 , elevated O 3 and elevated CO 2 +O 3 . Leaf instantaneous light-saturated photosynthesis (P S ) and leaf areas (A) were measured for all leaves of the current terminal, upper (current year) and the current-year increment of lower (1-year-old) lateral branches. An average, representative branch was chosen from each branch class. In addition, the average photosynthetic rate was estimated for the short-shoot leaves. A summing approach was used to estimate potential whole-plant C gain. The results of this method indicated that treatment differences were more pronounced at the plant-than at the leaf-or branch-level, because minor effects within modules accrued in scaling to plant level. The whole-plant response in C gain was determined by the counteracting changes in P S and A. For example, in the O 3 -sensitive clone (259), inhibition of P S in elevated O 3 (at both ambient and elevated CO 2 ) was partially ameliorated by an increase in total A. For the O 3 -tolerant clone (216), on the other hand, stimulation of photosynthetic rates in elevated CO 2 was nullified by decreased total A.

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Section: Resultsmentioning

confidence: 63%

The effect of elevated carbon dioxide and ozone on leaf- and branch-level photosynthesis and potential plant-level carbon gain in aspen

Noormets

McDonald

Dickson

et al. 2001

Trees

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show abstract

“…In this experiment, these changes in gas exchange in leaves exposed to ozone during emergence and expansion may have led to fewer injured tnesophyll cells than in the other groups. On the other hand, the increase of area of leaves that emerged under 90 ppb ozone stress may be a compensation mechanism to maintain photosynthesis, as suggested previously in hybrid poplar by Woodbury et al (1994). Therefore, the plants in which the leaves emerged under ozone exposure, and which showed the greatest increase in stomata] density and the greatest tolerance according to growth responses and injury development, seem to have the best ability to avoid ozone stress in this experiment.…”

Section: Discussionmentioning

confidence: 60%

“…In many experiments, increased allocation of pbotoassimilates to leaves at tbe expense ot roots bas been observed (Cooley & Manning, 1987;Cbappelka & Cbevone, 1992;Woodbur>' et aL, 1994). Increased leaf production in ozone-stressed bybrid poplar was tbougbt to be a compensatory reaction to maintain tbe pbotosyntbetic leaf area, although leaf abscission exceeded leaf production (Woodbury et al, 1994).…”

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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“…In this study, 31 out of 36 clones in the control chamber had higher root/shoot ratios than those in the ozone chamber (Woo, 1996). A reduction in the root/shoot ratio is one of the response patterns associated with a physiological/morphological adjustment to ozone stress , Woodbury et al 1994. Such responses are often referred to as examples of compensation.…”

Section: Discussionmentioning

confidence: 99%

The effects of ozone on growth and stomatal response in the F<sub>2</sub> generation of hybrid poplar (Populus trichocarpa × Populus deltoides)

Woo¹,

Hinckley²

2005

Biol. plant.

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Thirty-six F 2 hybrid poplar (Populus trichocarpa × P. deltoides) clones were fumigated with ozone to record its effects on growth, correlate them with stomatal response and screen for ozone sensitivity. Fumigation was applied for 6 to 9 h each day for approximately 3 months at ozone concentrations of 85 to 128 µg g -1 using open-top chambers. Height, diameter, number of leaves, stomatal conductance, transpiration rate, total biomass, biomass components and root/shoot ratios were reduced by ozone stress. Percent of leaf fall in ozone-treated plants was nearly three times higher than in control plants exposed to charcoal-filtered air. Leaf senescence, because of ozone exposure, did not appear to be associated with reduced biomass production. Some clones had a high percentage of leaf-fall with ozone exposure, but were able to maintain total biomass production near that of the control. Their response may be an example of an ability to adjust or compensate for ozone damage. There was no significant or consistent relationship between stomatal conductance and total biomass or the change in stomatal conductance as a result of ozone exposure and the change in total biomass. Taken together, these results suggest that effects of ozone on poplar growth cannot be solely correlated to changes in stomatal conductance, more physiological and biochemical parameters should be examined.Additional key words: leaf senescence, open top chamber, relative growth rate, stomatal conductance, transpiration rate.

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Chronic ozone exposure alters the growth of leaves, stems and roots of hybrid Populus

Cited by 33 publications

References 19 publications

The effect of elevated carbon dioxide and ozone on leaf- and branch-level photosynthesis and potential plant-level carbon gain in aspen

The effect of elevated carbon dioxide and ozone on leaf- and branch-level photosynthesis and potential plant-level carbon gain in aspen

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

The effects of ozone on growth and stomatal response in the F<sub>2</sub> generation of hybrid poplar (Populus trichocarpa × Populus deltoides)

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