| Leaf variegation in the rice zebra2 mutant is caused by photoperiodic accumulation of tetra-cis-lycopene and singlet oxygen. | |
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MedLine Citation:
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PMID: 22134723 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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In field conditions, the zebra2 (z2) mutant in rice (Oryza sativa) produces leaves with transverse pale-green/yellow stripes. It was recently reported that ZEBRA2 encodes carotenoid isomerase (CRTISO) and that low levels of lutein, an essential carotenoid for non-photochemical quenching, cause leaf variegation in z2 mutants. However, we found that the z2 mutant phenotype was completely suppressed by growth under continuous light (CL; permissive) conditions, with concentrations of chlorophyll, carotenoids and chloroplast proteins at normal levels in z2 mutants under CL. In addition, three types of reactive oxygen species (ROS; superoxide [O(2) (-)], hydrogen peroxide [H(2)O(2)], and singlet oxygen [(1)O(2)]) accumulated to high levels in z2 mutants grown under short-day conditions (SD; alternate 10-h light/14-h dark; restrictive), but do not accumulate under CL conditions. However, the levels of lutein and zeaxanthin in z2 leaves were much lower than normal in both permissive CL and restrictive SD growth conditions, indicating that deficiency of these two carotenoids is not responsible for the leaf variegation phenotype. We found that the CRTISO substrate tetra-cis-lycopene accumulated during the dark periods under SD, but not under CL conditions. Its accumulation was also positively correlated with (1)O(2) levels generated during the light period, which consequently altered the expression of (1)O(2)-responsive and cell death-related genes in the variegated z2 leaves. Taking these results together, we propose that the z2 leaf variegation can be largely attributed to photoperiodic accumulation of tetra-cis-lycopene and generation of excessive (1)O(2) under natural day-night conditions. |
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Authors:
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Su-Hyun Han; Yasuhito Sakuraba; Hee-Jong Koh; Nam-Chon Paek |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-11-29 |
Journal Detail:
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Title: Molecules and cells Volume: - ISSN: 0219-1032 ISO Abbreviation: - Publication Date: 2011 Nov |
Date Detail:
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Created Date: 2011-12-2 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9610936 Medline TA: Mol Cells Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Plant Science, Plant Genomics and Breeding Institute, and Research Institute for Agriculture and Life Sciences, Seoul National University, Seoul, 151-921, Korea. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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