Abstract
Mixed fluorescent and incandescent light increased growth and sink strength of the uppermost young shoot of rose plants (Rosa hybrida cv. Marimba) in comparison to pure fluorescent light. This was manifested by increased apical dominance. Monochromatic low-energy red light, given by means of optic fibers for 24 hours to shoot tips that had been previously darkened for 5 days, increased the transport of 14C-labeled assimilates to the intact tips and the uptake of [14C]sucrose by detached tips. Far-red had little or no effect, and blue was not effective at all in these reactions. Red light given directly to detached shoot tips, in vitro, increased the uptake of [14C]sucrose by the isolated tips. Adding far-red to the red greatly promoted the uptake, whereas blue and blue plus far-red were not active. The main character of the light reaction promoting sink activity in the shoot is that it is perceived by the shoot tip itself. It is operated by red light; far-red promotes the red effect but has little or no effect when alone. Light apparently promotes shoot sink activity by increasing the unloading process.
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- Goren R., Galston A. W. Control by phytochrome of C-sucrose incorporation into buds of etiolated pea seedlings. Plant Physiol. 1966 Jun;41(6):1055–1064. doi: 10.1104/pp.41.6.1055. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hampson S. E., Loomis R. S., Rains D. W. Characteristics of sugar uptake in hypocotyls of cotton. Plant Physiol. 1978 Dec;62(6):846–850. doi: 10.1104/pp.62.6.846. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Hartt C. E. Translocation in colored light. Plant Physiol. 1966 Mar;41(3):369–372. doi: 10.1104/pp.41.3.369. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Kasperbauer M. J. Spectral Distribution of Light in a Tobacco Canopy and Effects of End-of-Day Light Quality on Growth and Development. Plant Physiol. 1971 Jun;47(6):775–778. doi: 10.1104/pp.47.6.775. [DOI] [PMC free article] [PubMed] [Google Scholar]
- Mor Y., Halevy A. H. Promotion of sink activity of developing rose shoots by light. Plant Physiol. 1980 Nov;66(5):990–995. doi: 10.1104/pp.66.5.990. [DOI] [PMC free article] [PubMed] [Google Scholar]