Journal
PLANT GROWTH REGULATION
Volume 41, Issue 2, Pages 105-109Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1027332204010
Keywords
abscisic acid; deepwater rice; ethylene; gibberellin; internode growth; relative humidity
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The enhancement of internodal elongation in floating or deepwater rice (Oryza sativa L. cv. Habiganj Aman II) by treatment with ethylene or gibberellic acid (GA(3)) at high relative humidity (RH) is inhibited by abscisic acid (ABA). Here, we examined the interactive effects of ethylene, gibberellin (GA) and ABA at low RH on internodal elongation of deepwater rice stem segments. Although ethylene alone hardly promoted internodal elongation of stem sections at 30% RH, it enhanced the internodal elongation induced by GA(3). Application of ABA alone to stem segments had no effect on internodal elongation. However, in the presence of ethylene and GA(3) at 30% RH, ABA further promoted internodal elongation. This promotive effect of ABA was not found in the internodes of stem segments treated either with ethylene or with GA(3) at 30% RH or in the internodes of stem segments treated with ethylene and/or GA(3) at 100% RH.
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