Abstract
The light doses just above the threshold energy value for inducing the geotropic responsiveness in the roots of Zea mays L., cv. Golden Cross Bantam 70, caused a drastic rise in the NADPH level and a drop in the NADP level in 2-millimeter root tips. Some reducing agents lowered the threshold energy value up to about one-third of the control. From these results, we deduce that light may exert two functions in the geotropic response of Zea primary roots, one being the photochemical transformation of a photoreceptor and the other being the induction of a reduction state in the tissue.
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Selected References
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- AVRON M., JAGENDORF A. T. A TPNH diaphorase from chloroplasts. Arch Biochem Biophys. 1956 Dec;65(2):475–490. doi: 10.1016/0003-9861(56)90207-7. [DOI] [PubMed] [Google Scholar]
- Fujii T., Kondo N. Changes in the levels of nicotinamide nucleotides and in activities of NADP-dependent dehydrogenases after a brief illumination of red light. Dev Growth Differ. 1969 Jun;11(1):40–45. doi: 10.1111/j.1440-169x.1969.00040.x. [DOI] [PubMed] [Google Scholar]
- HENDRICKS S. B. Metabolic control of timing. Science. 1963 Jul 5;141(3575):21–27. doi: 10.1126/science.141.3575.21. [DOI] [PubMed] [Google Scholar]
- Klein R. M., Edsall P. C. Substitution of redox chemicals for radiation in phytochrome-mediated photomorphogenesis. Plant Physiol. 1966 Jun;41(6):949–952. doi: 10.1104/pp.41.6.949. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Manabe K. A Rapid Phytochrome-dependent Reduction of Nicotinamide Adenine Dinucleotide Phosphate in Particle Fraction from Etiolated Bean Hypocotyl. Plant Physiol. 1973 May;51(5):982–983. doi: 10.1104/pp.51.5.982. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Yamamoto Y. Pyridine Nucleotide Content in the Higher Plant. Effect of Age of Tissue. Plant Physiol. 1963 Jan;38(1):45–54. doi: 10.1104/pp.38.1.45. [DOI] [PMC free article] [PubMed] [Google Scholar]