Journal Article

Characterization of a Rice Chlorophyll-Deficient Mutant Using the T-DNA Gene-Trap System

Ki-Hong Jung, Junghe Hur, Choong-Hwan Ryu, Youngju Choi, Yong-Yoon Chung, Akio Miyao, Hirohiko Hirochika and Gynheung An

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 44, issue 5, pages 463-472
Published in print May 2003 | ISSN: 0032-0781
Published online May 2003 | e-ISSN: 1471-9053 | DOI: http://dx.doi.org/10.1093/pcp/pcg064
Characterization of a Rice Chlorophyll-Deficient Mutant Using the T-DNA Gene-Trap System

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  • Biochemistry
  • Molecular and Cell Biology
  • Plant Sciences and Forestry

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We have previously generated a large pool of T-DNA insertional lines in rice. In this study, we screened those T-DNA pools for rice mutants that had defective chlorophylls. Among the 1,995 lines examined in the T2 generation, 189 showed a chlorophyll-deficient phenotype that segregated as a single recessive locus. Among the mutants, 10 lines were β-glucuronidase (GUS)-positive in the leaves. Line 9-07117 has a T-DNA insertion into the gene that is highly homologous to XANTHA-F in barley and CHLH in Arabidopsis. This OsCHLH gene encodes the largest subunit of the rice Mg-chelatase, a key enzyme in the chlorophyll branch of the tetrapyrrole biosynthetic pathway. In the T2 and T3 generations, the chlorina mutant phenotypes are co-segregated with the T-DNA. We have identified two additional chlorina mutants that have a Tos17 insertion in the OsCHLH gene. Those phenotypes were co-segregated with Tos17 in the progeny. GUS assays and RNA blot analysis showed that expression of the OsCHLH gene is light inducible, while TEM analysis revealed that the thylakoid membrane of the mutant chloroplasts is underdeveloped. The chlorophyll content was very low in the OschlH mutants. This is the first report that T-DNA insertional mutagenesis can be used for functional analysis of rice genes.

Keywords: Keywords: Chlorina — GUS — Light inducible — Magnesium chelatase — Oryza sativa — T-DNA.; Abbreviations: GUS, β-glucuronidase; RT-PCR, reverse transcription-PCR.

Journal Article.  6067 words.  Illustrated.

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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