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Chronic ozone exacerbates the reduction in photosynthesis and acceleration of senescence caused by limited N availability in Nicotiana sylvestris.

Abstract：

:Both elevated ozone (O(3)) and limiting soil nitrogen (N) availability negatively affect crop performance. However, less is known about how the combination of elevated O(3) and limiting N affect crop growth and metabolism. In this study, we grew tobacco (Nicotiana sylvestris) in ambient and elevated O(3) at two N levels (limiting and sufficient). Results at the whole plant, leaf, and cellular level showed that primary metabolism was reduced by growth in limiting N, and that reduction was exacerbated by exposure to elevated O(3). Limiting N reduced the rates of photosynthetic CO(2) uptake by 40.8% in ambient O(3)-exposed plants, and by 58.6% in elevated O(3)-exposed plants, compared with plants grown with sufficient N. Reductions in photosynthesis compounded to cause large differences in leaf and whole plant parameters including leaf number, leaf area, and leaf and root biomass. These results were consistent with our meta-analysis of all published studies of plant responses to elevated O(3) and N availability. In tobacco, N uptake and allocation was also affected by growth in limiting N and elevated O(3), and there was an O(3)-induced compensatory response that resulted in increased N recycling from senescing leaves. In addition, transcript-based markers were used to track the progress through senescence, and indicated that limiting N and elevated O(3), separately and in combination, caused an acceleration of senescence. These results suggest that reductions in crop productivity in growing regions with poor soil fertility will be exacerbated by rising background O(3).

journal_name

Glob Chang Biol

journal_title

Global change biology

authors

Yendrek CR,Leisner CP,Ainsworth EA

doi

10.1111/gcb.12237

subject

Has Abstract

pub_date

2013-10-01 00:00:00

pages

3155-66

issue

10

eissn

1354-1013

issn

1365-2486

journal_volume

19

pub_type

杂志文章

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