Leaf age affects the responses of foliar injury and gas exchange to tropospheric ozone in Prunus serotina seedlings

Jianwei Zhang; Marcus Schaub; Jonathan A. Ferdinand; John M. Skelly; Kim C. Steiner; James E. Savage

doi:10.1016/j.envpol.2010.05.003

Treesearch

Leaf age affects the responses of foliar injury and gas exchange to tropospheric ozone in Prunus serotina seedlings

Formally Refereed

Authors:

Jianwei Zhang, Marcus Schaub, Jonathan A. Ferdinand, John M. Skelly, Kim C. Steiner, James E. Savage

Year:

2010

Type:

Scientific Journal

Station:

Pacific Southwest Research Station

DOI:

https://doi.org/10.1016/j.envpol.2010.05.003

Source:

Environmental Pollution, Vol. 158: 2627-2634

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Abstract

We investigated the effect of leaf age on the response of net photosynthesis (A), stomatal conductance (g_wv), foliar injury, and leaf nitrogen concentration (N_L) to tropospheric ozone (O₃) on Prunus serotina seedlings grown in open-plots (AA) and open-top chambers, supplied with either carbon-filtered or non-filtered air. We found significant variation in A, g_wv, foliar injury, and N_L (P < 0.05) among O₃ treatments. Seedlings in AA showed the highest A and g_wv due to relatively low vapor pressure deficit (VPD). Older leaves showed significantly lower A, g_wv, N_L, and higher foliar injury (P < 0.001) than younger leaves. Leaf age affected the response of A, g_wv, and foliar injury to O₃. Both VPD and N_L had a strong influence on leaf gas exchange. Foliar O₃-induced injury appeared when cumulative O₃ uptake reached 8–12 mmol m⁻², depending on soil water availability. The mechanistic assessment of O₃-induced injury is a valuable approach for a biologically relevant O₃ risk assessment for forest trees.

Keywords

black cherry, leaf age, leaf nitrogen ccontent, leaf gas exchange, ozone-induced foliar injury

Citation

Zhang, Jianwei; Schaub, Marcus; Ferdinand, Jonathan A.; Skelly, John M.; Steiner, Kim C.; Savage, James E. 2010. Leaf age affects the responses of foliar injury and gas exchange to tropospheric ozone in Prunus serotina seedlings. Environmental Pollution, Vol. 158: 2627-2634.