Journal of Plant Biotechnology

The Korean Society of Plant Biotechnology (한국식물생명공학회)
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Chlorosis of Ogura-CMS Brassica rapa is due to down-regulation of genes for chloroplast proteins

  • Jeong, Seok-Won (Department of Biological Science, College of Biological Science and Biotechnology, Chungnam National University) ;
  • Yi, Hankuil (Department of Biological Science, College of Biological Science and Biotechnology, Chungnam National University) ;
  • Song, Hayoung (Department of Biological Science, College of Biological Science and Biotechnology, Chungnam National University) ;
  • Lee, Soo-Seong (BioBreeding Institute, Business Incubation, Chung-Ang University) ;
  • Park, Youn-Il (Department of Biological Science, College of Biological Science and Biotechnology, Chungnam National University) ;
  • Hur, Yoonkang (Department of Biological Science, College of Biological Science and Biotechnology, Chungnam National University)
  • Received : 2017.06.13
  • Accepted : 2017.06.20
  • Published : 2017.06.30
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Abstract

Cytoplasmic male sterility (CMS) is a maternally inherited trait leading to loss of the ability to produce fertile pollen and is extensively used in hybrid crop breeding. Ogura-CMS was originally generated by insertion of orf138 upstream of atp8 in the radish mitochondrial genome and transferred to Brassica crops for hybrid breeding. Gene expression changes by dysfunctional mitochondria in Ogura-CMS result in pollen developmental defects, but little is known about gene expression patterns in vegetative tissue. To examine the interaction between nuclear and organellar regulation of gene expression, microarray and subsequent gene expression experiments were conducted with leaves of $F_1$ hybrid Chinese cabbage derived from self-incompatible (SI) or Ogura-CMS parents (Brassica rapa ssp. pekinensis). Out of 24,000 genes deposited on a KBGP24K microarray, 66 genes were up-regulated and 26 genes were down-regulated by over 2.5 fold in the CMS leaves. Up-regulated genes included stress-response genes and mitochondrial protein genes, while genes for ascorbic acid biosynthesis and thylakoid proteins were down-regulated. Most of the major component genes for light reactions of photosynthesis were highly expressed in leaves of both SI and CMS plants, but most of the corresponding proteins were found to be greatly reduced in leaves of CMS plants, indicating posttranscriptional regulation. Reduction in thylakoid proteins and chlorophylls led to reduction in photosynthetic efficiency and chlorosis of Ogura-CMS at low temperatures. This research provides a foundation for studying chloroplast function regulated by mitochondrial signal and for using organelle genome introgression in molecular breeding.

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References

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