Effect of temperature on phosphorus 32 uptake and translocation in varieties and a cross of oryza sativa japonica and oryza sativa indica rice

Reddy, P.R.; Rao, L.M.

Journal of Nuclear Agriculture and Biology 5(3): 48-51


ISSN/ISBN: 0379-5489
Accession: 005275113

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Three genotypes of rice [Oryza sativa], 1 in each of japonica, indica and a japonica-indica cross were grown in half-Hoagland culture solution. 32P (40 .mu.Ci/l) was added to each of these culture jars and placed at 10.degree., 20.degree., 30.degree. and 40.degree. C in growth chamber for a period of 1, 5 and 10 h at each temperature. The actual uptake of 32P in plant was very low at 10 and 20.degree. C; moderately low at 40.degree. C and very high at 30.degree. C in japonica and the cross. The uptake was higher at 30.degree. and 40.degree. C in indica. This indicates their ability in uptake of fertilizer at these temperatures. The percentage of adsorbed ions decreased at 10 and 20.degree. C and increased at 30 and 40.degree. C with increased duration in all the genotypes. The actual uptake of ions was in proportion to the adsorbed ions at higher temperatures and inversely proportional at lower temperatures. The percentage of translocation of 32P to shoot increased with time at 20.degree.-40.degree. C in indica, whereas it was high only at 30.degree. and 40.degree. C in japonica and the cross. The translocation was low at 10.degree. C in all genotypes. The uptake of 32P at different concentrations under different diurnal temperatures (20/10, 30/20 and 40/30.degree. C) was also studied.