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[en] A field experiment has been conducted to increase internal CO2 and Rubisco activity detected by 14C and to determinate which factors influence this activities. Plant material used was cotton plants which internal CO2 concentrations and Rubisco activity was observed at 35, 50, 65, 80 days after planting (DAP). Treatments applied were methanol with concentrations of 0%, 10%,20% and 30% at available water (AW) at 25-50% AW, 50-75% AW, 75-100% AW. Results obtained showed that application of methanol at concentration of 20% at 75-100% AW, increase internal CO2 from 266.60 ppm to 295.10 ppm (11 % increase) and this will also increase Rubisco activity from 3.81 to 14.28 (μmol. CO2 menit-1 (μmol. Rubisco-1). This increase is expected to push photosynthesis rate and result in increase cotton yield. The use of 14C was satisfactorily detected the amount of carbon. (author)
Source
Singgih Sutrisno; Sofyan Yatim; Pattiradjawane, EIsje L.; Ismachin, Moch; Mugiono; Marga Utama (National Nuclear Energy Agency, Jakarta (Indonesia)) (eds.); Nelly Dhevita Leswara; Umar Mansur (University of Indonesia, Jakarta (Indonesia)) (eds.); Syamsul Arifin Achmad (Bandung Institute of Technology, Bandung (Indonesia)); Komaruddin Idris (Bogor Agricultural University, Bogor (Indonesia)) (and others); Centre for Research and Development of Isotopes and Radiation Technology, National Nuclear Energy Agency (Indonesia); 323 p; ISBN 979-3558-03-2; 
; Feb 2004; p. 49-58; The Scientific Meeting on Research and Development of Isotopes Application and Radiation; Seminar Ilmiah Penelitian dan Pengembangan Aplikasi Isotop dan Radiasi; Jakarta (Indonesia); 17-18 Feb 2004; Also available from Center for Development of Nuclear Informatics, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 36 refs.; 7 tabs.; 8 figs.
; Feb 2004; p. 49-58; The Scientific Meeting on Research and Development of Isotopes Application and Radiation; Seminar Ilmiah Penelitian dan Pengembangan Aplikasi Isotop dan Radiasi; Jakarta (Indonesia); 17-18 Feb 2004; Also available from Center for Development of Nuclear Informatics, National Nuclear Energy Agency, Puspiptek Area, Fax. 62-21-7560923, PO BOX 4274, Jakarta (ID); 36 refs.; 7 tabs.; 8 figs.