Effects of temperature on the development ofSinapis albaL. phytochrome‐control of nitrate reductase activity at 10°C
作者:
S. M. MOROZ,
E. A. ALFORD,
C. B. JOHNSON,
期刊:
Plant, Cell&Environment
(WILEY Available online 1984)
卷期:
Volume 7,
issue 1
页码: 45-51
ISSN:0140-7791
年代: 1984
DOI:10.1111/j.1365-3040.1984.tb01199.x
出版商: Blackwell Publishing Ltd
关键词: Sinapis alba;Cruciferae;white mustard;nitrate reductase;phytochrome;competence;temperature
数据来源: WILEY
摘要:
Abstract.An analysis of three biochemical parameters during growth of white mustard in continuous white light (WL) has been undertaken at 10°, 15° and 20°C. The time required for anthocyanin and chlorophyll content and nitrate reductase [E.C. 1661 NAD(P)H: nitrate oxidoreductase] activity (NRA) to reach a peak in the cotyledons is shown to be temperature dependent, the rise in chlorophyll content being delayed to a much greater extent than anthocyanin content. In addition, with NRA, there is a significant increase in the level of the peaks with a lowering of temperature.The NRA in dark‐grown plants has been investigated in detail at 10°C. The pre‐competence time for this response is increased to 20–24 h, compared with 14 h in seeds grown at 25°C. Other responses are affected far more by the lower temperature; for example, time for 50% loss of photoreversibility of a red (R) pulse in 48‐h‐old seeds is approximately 13 h, compared with 8 min in seeds grown at 25°C. At 25°C, light treatments during precompetence have been found to increase significantly the effectiveness of a subsequent R pulse on NRA; at 10°C, this effect appears to be almos
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