High temperature in general was found to be the major factor affecting symbiotic nitrogen fixation. High temperature of 35EC when applied to the roots only didnt effect nitrogen fixation. However, small variances were recorded at 40EC in all cultivars. Fixation was severely inhibited at 45EC in all cultivars. The cultivar sable was found to be the most tolerant to high temperatures and it also recovered from heat stress better than the other cultivars. Although, cultivar bragg was not as heat tolerant as other but this recover better then other cultivars studied. Which were very similar in their sensitivities to heat stress.
PDF References Citation
How to cite this article
Mohammad Ibrahim Keerio, 2001. Nitrogenase Activity of Soybean Root Nodules Inhibited After Heat Stress. Journal of Applied Sciences, 1: 297-300.
- Dart, P.J. and J.M. Day, 1971. Effects of incubation temperature and oxygen tension on nitrogenase activity of legume root nodule. Plant Soil, 35: 167-184.
- Hartwig, U., B. Boller and J. Nosberger, 1987. Oxygen supply limits nitrogenase activity of clover nodules after defoliation. Ann. Bot., 59: 285-291.
- Kuzma, M.M. and D.B. Layzell, 1994. Acclimation of soybean nodules to changes in temperature. Plant Physiol., 106: 263-270.
- Pulver, E.L., F. Brockman and H.C. Wien, 1982. Nodulation of soybean cultivars with Rhizobium spp. and their response to inoculation with R. japonicum. Crop Sci., 22: 1065-1070.
- Rosendahl, L., 1984. Rhizobium strain effects on yield and bleeding sap amino compounds in Pisum sativum. Physiol. Plant., 60: 215-220.
- Sinclair, T.R. and P.R. Weisz, 1985. Response to soil temperature of dinitrogen fixation (acetylene reduction) rates by field-grown soybeans. Agron. J., 77: 685-688.