Light spectral quality effects on the growth of potato (Solanum tuberosum L.) nodal cuttings in vitro |
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Authors: | Deborah A Wilson Russell C Weigel Raymond M Wheeler John C Sager |
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Institution: | (1) Department of Biological Sciences, Florida Institute of Technology, 150 West University Blvd., 32901 Melbourne, Florida;(2) Biological Research & Life Support Office, NASA, Kennedy Space Center, 32899, Florida |
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Abstract: | Summary The effects of light spectral quality on the growth of in vitro nodal cuttings of potato (Solanum tuberosum L.) cultivars Norland, Superior, Kennebec, and Denali were examined. The different light spectra were provided by Vita-Lite
fluorescent (VF) (a white light control), blue fluorescent (BF), red fluorescent (RF), low-pressure sodium (LPS), and a combination
of low-pressure sodium plus cool-white fluorescent lamps (LPS/CWF). For all cultivars, stem lengths after 4 wk were longest
under LPS, followed by RF, LPS/CWF, VF, and BF (in descending order). Microscopic studies revealed that cells were shortest
when cultured in BF or VF environments, and were longest in RF or LPS lamp environments. The highest number of axillary branches
occurred on plantlets grown with LPS or LPS/CWF, whereas the lowest number occurred with BF. No leaf or stem edema (callus
or gall-like growths) occurred with LPS or LPS/CWF lighting, and no edema occurred on cv. Norland plantlets, regardless of
lighting. Results suggest that shoot morphologic development of in vitro grown potato plants can be controlled by controlling
irradiant spectral quality. |
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Keywords: | artificial light CELSS (closed ecological life support systems) in vitro nodes edema potato LPS low-pressure sodium |
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