Loss of nuclear gene expression during the phytochrome A-mediated far-red block of greening response

McCormac, Alex C. and Terry, Matthew J. (2002) Loss of nuclear gene expression during the phytochrome A-mediated far-red block of greening response Plant Physiology, 130, (1), pp. 402-414. (doi:10.1104/pp.003806).


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We have examined the expression of the HEMA1 gene, which encodes the key chlorophyll synthesis enzyme glutamyl-tRNA reductase, during the phytochrome A-mediated far-red light (FR) block of greening response in Arabidopsis. Our results demonstrate that the FR block of greening comprises two separate responses: a white light (WL) intensity-independent response that requires 3 d of FR and is associated with a loss of expression of the nuclear genes HEMA1 and Lhcb following the transfer to WL (transcriptionally coupled response) and a WL intensity-dependent response that is induced by 1 d of FR and is transcriptionally uncoupled. Both responses required phytochrome A. The transcriptionally uncoupled response correlated with a deregulation of tetrapyrrole synthesis and potential photooxidative damage and was inhibited by cytokinin. The transcriptionally coupled FR response was additive with the loss of expression following Norflurazon-induced photobleaching and was absent in the presence of sucrose or after lower fluence rate (1 µmol m2 s1) FR treatments. Both pathways leading to the loss of nuclear gene expression were inhibited by overexpression of NADPH:protochlorophyllide oxidoreductase, indicating a role for plastid signaling in the FR-mediated pathway. The significance of identifying a distinct phytochrome A-mediated plastid signaling pathway is discussed.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1104/pp.003806
ISSNs: 0032-0889 (print)
Related URLs:
ePrint ID: 56056
Date :
Date Event
September 2002Published
Date Deposited: 08 Aug 2008
Last Modified: 16 Apr 2017 17:42
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/56056

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