| Effects of red, far red, and blue light on enhancement of nitrate reductase activity and on nitrate uptake in etiolated rice seedlings. | |
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MedLine Citation:
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PMID: 16660864 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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The effects of red (R), far red (FR), or blue light (B) on the enhancement of nitrate reductase (NR) activity and on nitrate uptake in etiolated rice seedlings were examined. On 5-minute illumination followed by 12-hour dark, R caused marked increase of NR activity, but FR and B caused only slight increase. Illumination with 560 ergs per square centimeter per second of R for 5 minutes caused maximal increase. The effect of R was almost completely counteracted by subsequent illumination with 2,000 ergs per square centimeter per second of FR for 10 minutes, indicating that NR induction was mediated by phytochrome. Exogenous supply of inducer nitrate was not required during the 5-minute illumination and the R-FR cycles, if the seedlings were transferred to nitrate solution at the beginning of the dark incubation. NR activity in the shoots was found high when shoots were illuminated but was low when only roots were illuminated. On continuous illumination for 12 hours, B had more effect on NR increase than R.Nitrate uptake during 6-hour dark was not increased by exposure to R, FR, or B for 5 minutes at the beginning. On continuous illumination for 6 hours, R slightly increased nitrate uptake, whereas FR and B had no effect. |
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Authors:
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H Sasakawa; Y Yamamoto |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Plant physiology Volume: 63 ISSN: 0032-0889 ISO Abbreviation: Plant Physiol. Publication Date: 1979 Jun |
Date Detail:
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Created Date: 2010-06-29 Completed Date: 2010-06-29 Revised Date: 2010-09-15 |
Medline Journal Info:
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Nlm Unique ID: 0401224 Medline TA: Plant Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 1098-101 Citation Subset: - |
Affiliation:
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Laboratory of Plant Nutrition, Department of Agricultural Chemistry, Faculty of Agriculture, Nagoya University, Nagoya 464, Japan. |
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