In conclusion, the present results highlight relationships between water deficit and
certain physiological parameters (photosynthesis and diffusive leaf resistance), and
between these and plant growth and tuber yield, with implications for the optimisation of
genotype. Further investigations will be necessary to clarify the role of genotype on the
relationships among physiological parameters, plant growth, tuber yield and water-deficit
condition, with the aim of identifying cultivars which can adapt better to limited or
unlimited water conditions in the Mediterranean environment, with the overall goal of
saving valuable irrigation water.