Plant Physiol. Drug Metab Dispos
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Plant Physiology 61:851-854 (1978)
© 1978 American Society of Plant Biologists

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Environmental Parameters Affecting Dark Response of Rice Seedlings (Oryza sativa L.) to Triacontanol 1

H. C. Bittenbender, David R. Dilley, Violet Wert and Stanley K. Ries

Department of Horticulture, Pesticide Research Center, Michigan State University, East Lansing, Michigan 48824

Triacontanol applied to IR-8 rice (Oryza sativa L.) seedlings in nutrient solution caused an increase in dry weight during a 6-hour dark period. This increase was altered by atmospheric CO2 and O2 concentrations. The largest growth response occurred from 200 to 350 µliters/liter CO2 with 5% O2. The treated seedlings did not fix atmospheric CO2 in the dark, and the immediate products of photosynthesis were not involved in the dry weight increase. The growth response was characterized by an increase in soluble and insoluble Kjeldahl-N, and soluble carbohydrates. The response curve for dry weight increase was a linear function of log presentation time of triacontanol. The response exhibited an apparent Kdose of 25 minutes in 10 µg/liter triacontanol in the dark and 18 minutes in the light. Concentrations of 50 µg/liter and higher inhibited growth.

1 Michigan Agricultural Experiment Station Journal article No. 8171.




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 Plant Cell PhysiolHome page
X. Chen, H. Yuan, R. Chen, L. Zhu, B. Du, Q. Weng, and G. He
Isolation and Characterization of Triacontanol-Regulated Genes in Rice (Oryza sativa L.): Possible Role of Triacontanol as a Plant Growth Stimulator
Plant Cell Physiol., August 15, 2002; 43(8): 869 - 876.
[Abstract] [Full Text] [PDF]


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Copyright © 1978 by the American Society of Plant Biologists