ibclogo XVI International Botanical Congess

Abstract Number: 3269
Session = 11.18.3


Biochemical and isotopic evaluations of methane oxidation in tropical rice plant-soil system - Effect of cultivars and growth stage of rice plant


K Inubushi, H Sugii, T Hashimoto*, I Watanabe* and R. Wassmann** Fac. Horticulture, Chiba Univ., Matsudo 271-8510 Japan *ex Fac. Bioresources, Mie Univ., Tsu 514-8507 Japan**Soil Water Div., IRRI, P.O.Box 933, 1099 Manila, Phil.


Methane (CH4) oxidation was evaluated in rice plant transferred from field to pots. Effects of cultivars (NPT and IR72) and growth stage of rice on CH4 oxidation were examined by using propylene as an alternative substrate for CH4 oxidizing bacteria, being higher in root than stem and rhizosphere soil. Oxidized CH4 was estimated as about 15-30 % of produced CH4 in the soil. CH4 was more emitted by NPT than IR72 and influenced by growth stage. 13CH4 injected into chamber covered pots was transformed into 13CO2. These indicate active methane oxidation associated with rice plant.

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