Growth and photosynthesis of Lycopersicon esculentum plants as affected by nitrogen deficiency
1998
Guidi, L. | Soldatini, G.F. (Universita degli Studi di Pisa (Italy). Dipartemento di Chimica e Biotecnologie Agrarie) | Lorefice, G. | Pardossi, A. | Malorgio, F. | Tognoni, F.
Fully expanded leaves of tomato (Lycopersicon esculentum) growing with either complete or nitrogen-deficient nutrient solution were analyzed 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.
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