KOREAN JOURNAL OF CROP SCIENCE (한국작물학회지)

The Korean Society of Crop Science (한국작물학회)
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Changes of Endogenous Gibberellins in Tubers of Chinese Yam(Dioscorea opposita) during Storage Period

  • Lee, In-Jung (College of Agricultural Life Sciences, Division of Plant Biosciences, Kyungpook National University) ;
  • Kim, Sang-Kuk (Institute for Bioresources Research, Kyongbuk Provincial Agricultural Technology, Administration) ;
  • Lee, Sang-Chul (College of Agricultural Life Sciences, Division of Plant Biosciences, Kyungpook National University) ;
  • Lee, Bong-Ho (Institute for Bioresources Research, Kyongbuk Provincial Agricultural Technology, Administration) ;
  • Jeong, Hyung-Jin (School of Bioresources, College of Natural Sciences, Andong National University)
  • Published : 2003.09.01
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Abstract

For storage periods of tubers in Chinese yam, the levels of $\textrm{GA}_{44}$ and $\textrm{GA}_{20}$ was constant, meanwhile both $\textrm{GA}_{53}$ and $\textrm{GA}_{19}$ level were always higher than that of $\textrm{GA}_{44}$ and $\textrm{GA}_{20}$ㆍ $\textrm{GA}_9$ content as precursor of $\textrm{GA}_4$ was not changed during storage. $\textrm{GA}_{24}$ content was low to below 0.2 ng for 90 days after storage, $\textrm{GA}_{36}$ content as precursor of $\textrm{GA}_4$ like $\textrm{GA}_9$ was about 6-8 fold higher than that of $\textrm{GA}_9$ during storage. GA contents of the two gibberellin biosynthetic pathways were gradually increased when storage periods were progressed. Bioactive GA$_1$ content as the GA members of an early C-13 hydroxylation was always constant, and its content was very low as below 0.1ng per dry weight, meanwhile, bioactive $\textrm{GA}_4$ content as the GA members of non C-13 hydroxylation was drastically increased, also, its content was highest at 90 days after storage, and then decreased at 120 days after storage. Consequently, we suggest that $\textrm{GA}_4$ may be involved in controlling tuber sprouting in Chinese yam.

Keywords

References

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