This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Sasakawa, H. Articles by Yamamoto, Y. Search for Related Content PubMed PubMed Citation Articles by Sasakawa, H. Articles by Yamamoto, Y. Agricola Articles by Sasakawa, H. Articles by Yamamoto, Y.

Articles

Effects of Red, Far Red, and Blue Light on Enhancement of Nitrate Reductase Activity and on Nitrate Uptake in Etiolated Rice Seedlings ¹

^a Laboratory of Plant Nutrition, Department of Agricultural Chemistry, Faculty of Agriculture, Nagoya University, Nagoya 464, Japan

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.

This article has been cited by other articles:

				R. Matsuda, K. Ohashi-Kaneko, K. Fujiwara, and K. Kurata Effects of Blue Light Deficiency on Acclimation of Light Energy Partitioning in PSII and CO2 Assimilation Capacity to High Irradiance in Spinach Leaves Plant Cell Physiol., April 1, 2008; 49(4): 664 - 670. [Abstract] [Full Text] [PDF]