Knock-out of the plastid ribosomal protein S21 causes impaired photosynthesis and sugar-response during germination and seedling development in Arabidopsis thaliana
To clarify the mechanism of sugar-response of higher plants, the ghs1 (glucose hypersensitive) mutant of Arabidopsis was isolated and characterized. The ghs1 mutant had an increased sensitivity to glucose, showing a dramatic inhibition of chlorophyll synthesis and developmental arrest of leaves when...
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Published in | Plant and cell physiology Vol. 45; no. 6; pp. 781 - 788 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Japan
Oxford University Press
01.06.2004
Oxford Publishing Limited (England) |
Subjects | |
Online Access | Get full text |
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Summary: | To clarify the mechanism of sugar-response of higher plants, the ghs1 (glucose hypersensitive) mutant of Arabidopsis was isolated and characterized. The ghs1 mutant had an increased sensitivity to glucose, showing a dramatic inhibition of chlorophyll synthesis and developmental arrest of leaves when grown on medium containing more than 5% glucose; the wild type required exposure to 7% glucose to show the same response. The ghs1 mutant is a single recessive loss-of-function mutation caused by a T-DNA insertion in the GHS1 gene (At3g27160), which encodes the plastid 30S ribosomal protein S21. The mutant showed: (1) reduction in the translation product but not the transcript for plastid-encoded rbcL, (2) reduction in photosynthetic activity monitored with pulse-amplitude modulated fluorometry, (3) impaired chloroplast development, as observed by electron microscopy. These results indicate that the deficiency of such chloroplast functions as photosynthetic activity observed in the ghs1 mutant is caused by impaired plastid protein synthesis associated with loss of ribosomal S21 protein. Relationships between the GHS1 gene and sugar-response are discussed. |
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Bibliography: | 2005003136 F60 F30 F62 istex:7CF1AA1350A481E0CB2C32B7BA10D1D061021910 Received December 9, 2003; Accepted April 7, 2004 ark:/67375/HXZ-FH6KMQWM-1 local:pch093 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0032-0781 1471-9053 |
DOI: | 10.1093/pcp/pch093 |