Effects of Foliar-sprayed Diniconazole on Contents of Endogenous Gibberellic Acids and Abscisic Acid in Lilium davuricum
2011
Eum, S.J., Yeungnam University, Gyeongsan, Republic of Korea | Park, K.I., Yeungnam University, Gyeongsan, Republic of Korea | Lee, I.J., Kyungpook National University, Daegu, Republic of Korea | Choi, Y.J., Gangjin Agricultural Technology and Extension Center, Gangjin, Republic of Korea | Oh, W., Yeungnam University, Gyeongsan, Republic of Korea | Kim, K.W., Yeungnam University, Gyeongsan, Republic of Korea
Plant growth retardants reduce the plant height by inhibiting stem elongation in Lilium davuricum. To investigate the plant hormones related to stem elongation, we sprayed 50 mgㆍL-¹ diniconazole to young plants of L. davuricum and quantified the contents of endogenous gibberellic acids (GA) and abscisic acid (ABA). In GA biosynthesis, L. davuricum had not only the early C-13 hydroxylation (GA∧19 → GA∧20 → GA₁) pathway resulting in GA₁ as the active form but also the non C-13 hydroxylation (NCH, GA∧12 → GA∧24 → GA∧9 → GA₄) with GA₄ as the active form. However, the main pathway was NCH because GA₄ concentration of 55 ngㆍg-¹ dry wt was much higher than GA₁ content of 0.23 ngㆍg-¹ dry wt in control plant. Diniconazole inhibited GA biosynthesis through NCH pathway from its early stage. GA∧12 content decreased by diniconazole up to 6% level of that of control and this effect continued to GA₄. Diniconazole reduced GA∧12 content by 12.7 ngㆍg-¹ dry wt, whereas that of control plant was 213.8 ngㆍg-¹ dry wt. ABA content decreased up to one third of control by diniconazole application. From the contents of endogenous GA₄, GA₁, and ABA in this study, we could conclude that diniconazole reduces the plant height by inhibiting GA₄ biosynthesis in L. davuricum.
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