The leaf greenness (measured by a portable chlorophyll meter SPAD-501) has been used to differentiate table grape genotypes (Vitis vinifera) in water stress condition . The SPAD and chlorophyll values are lower in the stressed treatment after 2 weeks from the onset of stress . Linear response model has been observed between the chlorophyll content and the SPAD readings . The leaf greenness (SPAD readings) of apical and expanded leaves seems an easy indicator, which might be used for screening grape genotypes (Vitis vinifera) for drougth tolerance .

SummaryA portable leaf greenness meter (SPAD‐501) has been used to provide a rapid and non‐destructive measurement of leaf chlorophyll in Vitis vinifera. Leaf extracted chlorophyll was related linearly to SPAD readings. It is suggested that separate linear equations should be developed for each cultivar so as to maximise the accuracy of estimating leaf chlorophyll content as a function of SPAD readings.