Effects of red, far red, and blue light on enhancement of nitrate reductase activity and on nitrate uptake in etiolated rice seedlings.
Effects of red, far red, and blue light on enhancement of nitrate reductase activity and on nitrate uptake in etiolated rice seedlings.
复制标题
红光、远红光和蓝光对黄化水稻幼苗硝酸盐还原酶活性增强和硝酸盐吸收的影响。
DOI：
10.1104/pp.63.6.1098
复制
发表时间：
1979
期刊：
影响因子：
7.4
通讯作者：
Y. Yamamoto
中科院分区：
文献类型：
--
作者：
H. Sasakawa;Y. Yamamoto
研究了红光(R)、远红光（FR）和蓝光(B)对黄化水稻幼苗硝酸盐还原酶（NR）活性和硝酸盐吸收的影响。光照5 min后暗12 h， R引起NR活性显著升高，FR和B引起NR活性轻微升高。以560尔格/平方厘米/秒的R照射5分钟，增加最大。随后以2000尔格/平方厘米/秒FR照射10分钟，几乎完全抵消了R的影响，表明光敏色素介导了NR的诱导。在5分钟光照和R-FR循环中，如果幼苗在暗孵育开始时转移到硝酸盐溶液中，则不需要外源提供诱导剂硝酸盐。在光照条件下，嫩枝中NR活性较高，而在仅光照根时，NR活性较低。在连续光照12小时的情况下，B对NR增加的影响大于R。在6小时的黑暗中，R、FR或B在开始时暴露5分钟没有增加硝酸盐的吸收。在连续光照6 h时，R略微增加了硝酸盐的吸收，而FR和B则没有影响。
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.