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Science 17 May 1974:
Vol. 184. no. 4138, pp. 800 - 802
DOI: 10.1126/science.184.4138.800
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Articles

Genetic Regulation of Chlorophyll Synthesis Analyzed with Mutants in Barley

Diter Von Wettstein 1, Albert Kahn 2, Ole F. Nielsen 2, and Simon Gough 3

1 Institute of Genetics, University of Copenhagen, and Department of Physiology, Carlsberg Laboratory, Copenhagen, Denmark
2 Institute of Genetics, University of Copenhagen, DK-1353 Copenhagen K.
3 Department of Physiology, Carlsberg Laboratory DK-2500 Copenhagen Valby

Barley seedlings homozygous both for the xantha-135 and tigrina-d12 mutation accumulate magnesium protopophyrins and other precursors of chlorophyllide constitutively in darkness. The homozygous double mutant xantha-f10, tigrina-O34 produces protoporphyrin constitutively. These results provide evidence for the control of chlorophyllide synthesis in higher plants through the products of regulatory genes in the nucleus.


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A role for chlorophyllide a oxygenase in the regulated import and stabilization of light-harvesting chlorophyll a/b proteins.
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Xantha-l encodes a membrane subunit of the aerobic Mg-protoporphyrin IX monomethyl ester cyclase involved in chlorophyll biosynthesis.
K. Rzeznicka, C. J. Walker, T. Westergren, C. G. Kannangara, D. von Wettstein, S. Merchant, S. P. Gough, and M. Hansson (2005)
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Substrate-Dependent and Organ-Specific Chloroplast Protein Import in Planta.
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Arabidopsis CHL27, located in both envelope and thylakoid membranes, is required for the synthesis of protochlorophyllide.
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Molecular basis for semidominance of missense mutations in the XANTHA-H (42-kDa) subunit of magnesium chelatase.
A. Hansson, C. G. Kannangara, D. von Wettstein, and M. Hansson (1999)
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Science. ISSN 0036-8075 (print), 1095-9203 (online)