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Published online 23 September 2005
Published in Crop Sci 45:2374-2382 (2005)
© 2005 Crop Science Society of America
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Physiological Limitations to Photosynthetic Carbon Assimilation in Cotton under Water Stress

Said Ennahlia and Hugh J. Earlb,*

a Dep. of Crop and Soil Sciences, Univ. of Georgia, Athens, GA 30602-7272
b Dep. of Plant Agriculture, Univ. of Guelph, Guelph, ON, Canada N1G 2W1



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  		Fig. 1. Relative soil water content vs. time for the control treatment (75% RSWC) and three water stress treatments in Exp. 1 (top) and for the control, stress, and two recovery treatments in Exp. 2 (bottom). Each trace represents typical data for a single pot.

 


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  		Fig. 2. Determining the true light saturated F'M by the three-pulse method. Apparent F'M was determined for three 0.8-s pulses of different PPFD, then the light-saturated F'M (at infinite PPFD) was estimated as the intercept of the linear regression of apparent F'M on the inverse of PPFD during the pulse. Example data are shown for leaves from each of the three water stress treatments in Exp. 1. Actinic PPFD during the measurement was 1500 µmol m–2 s–1 in every case.

 


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  		Fig. 3. Examples of the relationship between AN and Ci (top) and AN and CC (bottom) for each of the four water stress treatments in Exp. 1.

 




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