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- Smith, H.; Xu, Y.; Quail, P.H.
- Plant physiology 1997 v.114 no.2 pp. 637-641
- Arabidopsis thaliana; seedlings; hypocotyls; phytochrome; dose response; red light; far-red light; genetic variation; genotype; etiolation
- ... Using dichromatic radiation, we show that the actions of phytochromes A and B (phyA and phyB) in Arabidopsis thaliana are antagonistic in mediating red and far-red radiation effects on seedling de-etiolation and yet act in a complementary manner to regulate de-etiolation, irrespective of spectral composition. At low phytochrome photoequilibria inhibition of hypocotyl extension was strong, because ...
- Trost, P.; Foscarini, S.; Preger, V.; Bonora, P.; Vitale, L.; Pupillo, P.
- Plant physiology 1997 v.114 no.2 pp. 737-746
- dose response; hypocotyls; NADP (coenzyme); oxidoreductases; Cucurbita pepo; enzyme inhibitors; binding sites; etiolation; plasma membrane; enzyme activity; protein composition
- ... Quinone oxidoreductase activities dependent on pyridine nucleotides are associated with the plasma membrane (PM) in zucchini (Cucurbita pepo L.) hypocotyls. In the presence of NADPH, lipophilic ubiquinone homologs with up to three isoprenoid units were reduced by intact PM vesicles with a Km of 2 to 7 micromolars. Affinities for both NADPH and NADH were similar (Km of 62 and 51 micromolars, respec ...