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Restoration of gibberellin biosynthesis by 2,6-diisopropylphenoxyacetic acid in uniconazole-treated rice plants

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Abstract

2,6-Diisopropylphenoxyacetic acid (DIPA), a promoter of growth and flowering of Sagittaria species, was found to improve the shoot growth of rice plants treated with uniconazole, an inhibitor of gibberellin (GA) biosynthesis. In a modified micro-drop bioassay using semi-dwarf rice, Oryza sativa L. cv. Tan-ginbozu, in which uniconazole had been incorporated into the agar medium, a significant recovery from growth inhibition was observed for both the 3rd and the 4th leaf sheaths but not for the 2nd sheath. In greenhouse experiments, uniconazole-treated rice plants partially recovered from growth inhibition when DIPA was applied after uniconazole treatment, whereas DIPA applied with, or before, uniconazole treatment did not improve growth. The levels of GA1 and GA20 in the rice plants treated with uniconazole plus DIPA were almost equal to those of the untreated controls, indicating that the observed growth recovery is attributable to the restoration of GA biosynthesis by DIPA.

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Authors and Affiliations

  1. Weed Science Center, Utsunomiya University, Utsunomiya, 321-8505, Japan

    Kanae Noguchi, Hitoshi Kuramochi, Yasutomo Takeuchi, Makoto Konnai & Koichi Yoneyama

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  1. Kanae Noguchi
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  2. Hitoshi Kuramochi
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  3. Yasutomo Takeuchi
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  4. Makoto Konnai
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  5. Koichi Yoneyama
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Noguchi, K., Kuramochi, H., Takeuchi, Y. et al. Restoration of gibberellin biosynthesis by 2,6-diisopropylphenoxyacetic acid in uniconazole-treated rice plants. Plant Growth Regulation 28, 67–72 (1999). https://doi.org/10.1023/A:1006215428363

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