Such changes were highly significant independent from whether the NO 3 :NH 4 ratio in all comparing media was the same, i.e., 12.19 (the same as in the BI medium) or it was increasing in the range from 12.19 up to 38.5 (both p < 0.001).
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Repression of Carotenoid Accumulation by Nitrogen and NH<sub>4</sub><sup>+</sup> Supply in Carrot Callus Cells In Vitro.
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