The effect of water deficit and subsequent regeneration on selected physiological characteristics in tomatoes (Lycopersicon esculentum)
2004
Hnilickova, H. | Duffek, J. (Ceska Zemedelska Univ., Prague (Czech Republic). Katedra Zahradnictvi)
The effect of water deficit and subsequent regeneration in tomatoes (varieties Monika F1, Stupicke polni rane and Start F1) on the rate of photosynthesis (PN), rate of transpiration (E) and stomatal conductance (gs) was studied in pot trials. Irrigation was discontinued in a stressed variant (S) for five days, then it was again renewed. Water deficit resulted in reduction of stomatal conductance up to zero value and decrease of the rate of photosynthesis and transpiration. Zero stomatal conductance was reached in the variety Monika F1 on the fifth day of dehydration and in the varieties Stupicke and Start F1 on the first day of rehydration. The measured differences in the rate of photosynthesis between control and non-irrigated plants were statistically significant. Plant reaction differed according to the variety, the lowest rate of photosynthesis was recorded in the variety Monika F1. Gradual regeneration of physiological processes appeared during the first four days after rehydration, but pre-stress level was not reached in any of the studied parameters as the average rate of photosynthesis in the fifth day was only 51.8 % of that of control plants.
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