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J Integr Plant Biol, 1997, 39 (7): -, Research Article
Effect of Pentefezol on the Endogenous IAA Content in Rice Seedlings
Wang Xi, Yu Mei-yu, Tao Long-xing and Huang Xiao-lin
doi:
Abstract
Two rice ( Oryza sativa L. ) cultivars, tall cv. "Taizongyu 65" and dwarf cv."Jiangsu’ai", were used in the experiments to study the biological efficacy of pentefezol (S-07) to endogenous IAA in dee seedlings. When dee seeds were soaked in S-07 solution for a period of time, the rice seedlings were dwarfed as the content of endogenous IAA was reduced. The results indicated that S-07 enhanced the activity of IAA-oxidase and reduced the rate of transformation of 3H-tryptophan into 3H-IAA. Thus the endogenous IAA content of rice seedlings were reduced by S-07 treatment leading to subsequent retardation of the growth rate of seedlings. Moreover the rate of distribution of 3H-IAA in leaves and roots of rice seedlings were also reduced by S-07 treatment.
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