Document Detail

A chimeric photoreceptor gene, NEOCHROME, has arisen twice during plant evolution.
MedLine Citation:
PMID:  16174755     Owner:  NLM     Status:  MEDLINE    
Although most plant species from algae to flowering plants use blue light for inducing phototropism and chloroplast movement, many ferns, some mosses, and green algae use red as well as blue light for the regulation of these responses, resulting in better sensitivity at low light levels. During their evolution, ferns have created a chimeric photoreceptor (phy3 in Adiantum) between phytochrome (phy) and phototropin (phot) enabling them to use red light effectively. We have identified two genes resembling Adiantum PHY3, NEOCHROME1 and NEOCHROME2 (MsNEO1 and MsNEO2), in the green alga Mougeotia scalaris, a plant famous for its light-regulated chloroplast movement. Like Adiantum PHY3, both MsNEO gene products show phytochrome-typical bilin binding and red/far-red reversibility, the difference spectra matching the known action spectra of light-induced chloroplast movement in Mougeotia. Furthermore, both genes rescue red-light-induced chloroplast movement in Adiantum phy3 mutants, indicating functional equivalence. However, the fern and algal genes seem to have arisen independently in evolution, thus providing an intriguing example of convergent evolution.
Noriyuki Suetsugu; Franz Mittmann; Gottfried Wagner; Jon Hughes; Masamitsu Wada
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-09-08
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  102     ISSN:  0027-8424     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2005 Sep 
Date Detail:
Created Date:  2005-09-21     Completed Date:  2005-11-08     Revised Date:  2013-06-07    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  13705-9     Citation Subset:  IM    
Division of Photobiology, National Institute for Basic Biology, Okazaki 444-8585, Japan.
Data Bank Information
Bank Name/Acc. No.:
GENBANK/AB206961;  AB206962;  AB206963;  AB206964;  AB206965;  AB206966;  AB206967;  AB206968;  AB206969;  AB206970;  AY878549
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MeSH Terms
Adiantum / genetics,  metabolism
Base Sequence
Chlorophyta / genetics*,  metabolism
Chloroplasts / genetics,  metabolism
Evolution, Molecular*
Molecular Sequence Data
Photosynthetic Reaction Center Complex Proteins / genetics*,  metabolism
Phytochrome / metabolism
Plant Proteins / genetics*
Reg. No./Substance:
0/Photosynthetic Reaction Center Complex Proteins; 0/Plant Proteins; 11121-56-5/Phytochrome

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