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KMID : 0903620040450040177
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Journal of the Korean Society for Horticultural Science
2004 Volume.45 No. 4 p.177 ~ p.182
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Two Gibberellin Biosynthetic Pathways Operated in Spinach Beet Leaves
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Seo Hye-Song
Kim Sang-Kuk
Jang Soo-Won
Choo Yeon-Sik
Song Seong-Dal
Kim Hak-Yoon
Lee In-Jung
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Abstract
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The metabolism of [¹⁴C]GA₁₂ in spinach beet (Beta vulgaris L. subsp. cicla) leaves was examined to determine the pathway of endogenous gibberellins in seedling stage. [¹⁴C]GA₁₂ was metabolized to GA?₃, GA₄₄, GA₁?, GA₂?, GA₁, GA8, GA₁?, GA₂₄, GA?, GA₃?, and GA₄. Radioactivity of GAs in the early C-13 hydroxylation route was three times higher than that in the non C-13 hydroxylation route in analyzed GA-metabolites. Radioactivity of GA₁ was always higher than that of GA₄ at every feeding time. The major pathway of endogenous GA metabolism in spinach beet leaves might be the early C-13 hydroxylation pathway.
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KEYWORD
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Beta vulgaris, feeding, metabolism, terpenoids
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