JXB Advance Access first published online on April 18, 2005
This version published online on November 22, 2005
Journal of Experimental Botany, doi:10.1093/jxb/eri153
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1 Environnement et Grandes Cultures, INRA, F-78 850 Thiverval Grignon, France
* To whom correspondence should be addressed. Quantification of the damaging effects of pathogens on diseased plants and inclusion of these damaging functions in crop simulation models is of great importance for a more complete understanding of yield response to diseases. In this study, the effect of Septoria tritici blotch (STB) on net photosynthetic and dark respiration rates of wheat flag leaves was quantified. Bastiaans' model: Y=(1-x) A previous version of this paper included data showing that, in our experimental conditions, the location on the leaf of the photosynthesis measurements can be ignored when estimating net photosynthesis rate on control leaves. Since these data were published in Robert et al., 2005, New Phytologist (Fig. 3), they were removed from the present version of this paper.
Received August 10, 2004
Accepted March 2, 2005
RESEARCH PAPER
Quantification of the effects of Septoria tritici blotch on wheat leaf gas exchange with respect to lesion age, leaf number, and leaf nitrogen status
Corinne Robert 1 *,
Marie-Odile Bancal 1,
Christian Lannou 2,
and
Bertrand Ney 1
2 Laboratoire Pathologie Végétale, INRA, F-78 850 Thiverval Grignon, France
Corinne Robert, E-mail: robert{at}bcgn.grignon.inra.fr
Abstract 
was used to characterize the relationship between relative leaf photosynthesis (Y, considering Ynet and Ygross) and STB severity (with x the proportion of the diseased area). The value of indicates whether the effect of disease on photosynthesis is larger ( >1), lower ( <1), or equal ( =1) to the proportion of visible diseased area. In the experimental conditions used here, leaf nitrogen content (in a range from 0.18 to 0.24 mg cm-2), and leaf number (flag and second leaves) did not significantly influence the effect of STB on leaf gas exchange. By contrast, damage depended strongly on the developmental stages of the STB lesions. STB lesions had no effect on inoculated leaves before visible symptoms appeared. Chlorotic symptoms had less effect on leaf net photosynthetic rate than could be accounted for by the visible diseased area (net=0.81). The effect of necrotic lesions on the leaf net photosynthetic capacity was slightly greater than that accounted for by visible symptoms (net=1.35). Our results suggest that the effect of the necrotic symptoms on the net photosynthesis expressed by net >1 is due to a combination of a decrease in the gross photosynthesis (gross still >1) and to an increase in the dark respiration rate (gross<net). Finally, it is discussed how the results could improve the prediction of crop loss caused by an STB epidemic in wheat fields.
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