Abstract
Fully expanded leaves of tomato (Lycopersicon esculentum) growing with either complete or nitrogen-deficient nutrient solution were analysed for leaf water status, gas exchange and chlorophyll fluorescence during the vegetative and reproductive phases. N-deficiency did not affect leaf water relations but did decrease light saturated photosynthetic rate as well as stomatal conductance in the vegetative stage. A lower variable to maximum fluorescence ratio (Fv/Fm) was found in N-limited plants which also showed an increase in leaf starch content and in starch to sucrose ratio. The inhibition of photosynthesis and the alteration of photosynthates partitioning were responsible for the growth reduction in N-stressed plants. During the reproductive phase the limitation of photosynthesis may be due to a large accumulation of starch which determines both a decrease in the carbon demand from the sinks and a decrease in CO2 conductance in the mesophyll.
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Guidi, L., Lorefice, G., Pardossi, A. et al. Growth and photosynthesis of Lycopersicon esculentum (L.) plants as affected by nitrogen deficiency. Biologia Plantarum 40, 235–244 (1997). https://doi.org/10.1023/A:1001068603778
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DOI: https://doi.org/10.1023/A:1001068603778