Water stress effects on nitrogen assimilation in tomato plants cv INCA 9-1
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Abstract
the effects caused by drought and flooding on leaf
assimilation of nitrogen in tomato plants (Lycopersicon
esculentum Mill.) INCA cv 9-1. The experiments were carried
out under semicontrolled conditions and when the plants were
in the flowering stage, three treatments were applied for 72
hours: normal irrigation (control), nonirrigation (drought) and
water supply up to 1 cm over soil surface (flooding). Nitrate
ion, amino acid and protein levels as well as the activity of
glutamate dehydrogenase, glutamine synthetase and
glutamate synthase enzyme and leaf water potential were
determined. Humidity stress treatments increased amino acid
content and enzyme activity; meanwhile drought diminished
nitrate and protein levels, flooding increased them. Water
potential diminished with treatment application. Changes
caused by drought were more severe than those of flooding.
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