Abstract
The aim of the experiment was to investigate and evaluate morphological changes provoked by the progressive water stress on Leaf Relative Water Content (LRWC), height of plant, number of leaves, shoot dry matter, root dry matter in plants of soybean cultivar sambaiba. The experimental design was at randomized entirely factorial, with 2 hydric conditions (stress and control) and 4 stress points (0, 2, 4 and 6 days). It were showed in the plants under water stress drop in LRWC of 81.5 until 60.9% due water deficiency in substrate, the number of leaves increase at both the treatments, it being showed after of 6 days the increase of 24.2 and 44.8% in the plants under stress and control, respectively. It was showed different behavior of the root dry matter in plants under water stress, with higher root matter until the 2 days and lower matter after of this point, when compared with control plants. The study with soybean cultivar sambaiba under progressive water stress reveal that occurred reduction in the parameters from the experiment beginning, however significant morphological changes in the number of leaves and root dry matter were showed only after 6 days of water restriction.
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