期刊
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
卷 74, 期 1, 页码 47-54出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2004.02.001
关键词
phytochrome A; protochlorophyllide; oxidoreductase; spectroscopy; regulation; etiolated plants
It is well-documented that phytochrome A (phyA) down-regulates the synthesis of NADPH:protochlorophyllide (Pchlide) oxidoreductase and active Pchlide(655) under far-red light (FR). In this work, we demonstrate that phyA can up-regulate the synthesis of Pchlide 655 under FR as well and that its sign and extent depend on plant species and tissue. With the use of fluorescence spectroscopy, it was found that [Pchlide(655)] in the upper stems of FR-grown seedlings of pea and tobacco increased greater than or equal to 10-fold and much lower in cotyledons or leaves as compared with the dark-grown. In the upper stems of Arabidopsis and tomato, the positive effect of FR was low, 1.2- to 1.5-fold, and the negative effect of FR was seen in cotyledons. In stems of wild-type (WT) tobacco and its line overexpressing full-length oat phyA (FL), we observed gross stimulating effect of FR while in its line overexpressing N-terminally truncated (Delta7-69) oat phyA (NA) it was low. Because WT and FL comprise both native phyA forms, phyA' and phyA, while NA, only phyA, the regulation under FR can be associated with phyA', while phyA inhibits the action of phyA'. In etiolated seedlings of the NA line, [Pchlide(655)] was much higher than in those of WT and FL suggesting that phyA may have relation to this enhancement. The regulation of Pchlide(633) in contrast to Pchlide(655) was positive independent of the plant species and tissue. (C) 2004 Elsevier B.V. All rights reserved.
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