Abstract
Transformed Nicotiana plumbaginifolia plants, constitutively expressing a chimaeric nitrate reductase gene (nia2 gene transcript fused to the constitutive CaMV 35S promoter), were cultivated in greenhouses at INRA, Versailles (from October to December 1991). They were supplied with either 12 mM or 1 mM NO 3 - , and given either a 12 h or a 24 h photoperiod. These plants exhibited a nitrate reductase activity in the leaves 25-150% higher than that of the wild-type plants. The physiological consequences of this deregulated expression were further characterized
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