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This research was conducted with the aim to among forty-one tested tomato   (Lycopersicon esculentum Mill) populations distinguish those tolerant to   limited water supply. Tolerance assessments were performed by using sixteen   drought stress selection indices calculated on the basis of tomato shoot and   root dry weight yields determined at water stress and non-stress conditions.   Populations were differentiated in groups using the method of cluster   analysis. The pot experiment was set in controlled greenhouse conditions and   comprised optimally irrigated control and drought treatment (35.0 and 20.9%   volumetric soil water content, respectively), imposed at the phase of   intensive vegetative growth. The experiment was conducted at the Institute   for Vegetable Crops in Smederevska Palanka, Serbia. The analyzed tomatoes   exhibited significant differences in terms of response to limited irrigation,   which had more pronounced effect on shoot dry weight than on the roots   (average decrease of 64.4 and 35.7%, respectively). Consequently, root   fraction in the total dry weight increased at drought for 68.2% on average.   Shoot and root dry weights were positively correlated at optimal irrigation   but not in drought, implying genotypic differences in terms of root   adjustments to stress conditions. As for the calculated selection indices,   substantial variation was found among the populations enabling their ranking   in terms of drought tolerance. Since ranking was not the same in all cases,   clustering the populations was performed taking into account all sixteen   selection indices. The results of this analysis indicate that populations   designated with numbers 126, 124, 131, 125, 128, 105, 101, 138, 110, 132 and   109 in Institute for Vegetable Crops germplasm collection exhibit   satisfactory level of drought tolerance at vegetative phase and therefore may   be used as parents in breeding programs. [Projekat Ministarstva nauke   Republike Srbije, br. TR 31005 i br. TR 31059

Shoot and root dry weight in drought exposed tomato populations