01586naa a2200217 a 450000100080000000500110000800800410001910000160006024501030007626000090017952009980018865000220118665000150120865000130122365000170123665000160125365300170126970000180128670000180130477300460132214577662025-03-21       1993    bl uuuu     u00u1 u    #d1 aHUNGRIA, M.  aNew sources of high-temperature tolerant rhizobia for Phaseolus vulgaris L.h[electronic resource]  c1993  aCommon bean (Phaseolus vulgaris L.) represents an important crop in tropics, but previous screenings of Rhizobium leguminosarum bv. phaseoli did not show strains that could fix N2 im symbiosis with bean at temperatures higher than 35o.C (Hungria and Franco, 1993). However, there are other rhizobia and bradyrhizobia species that nodulate some tropical leguminous tress and can fix N2 at high temperatures.In a trial of rhizobial strains isolated from leguminous trees, we found that 14 out of 21 isolates from Gliricidia. Lonchocarpus and Leucaena were also able to nodulate common beans at optimal temperatures (28/23o.C. day/night). When we exposed beans inoculated with these strains to high temperature conditions, 40oC/8h/day, some of them accumulated at flowering time as much or more N as bean plants receiving mineral N. These broad host-range sources of rhizobia capable of fixing nitrogen with bean at high temperature seem to have the potential to improve yields in tropical soils.  anitrogen fixation  aGliricidia  aLeucaena  aLonchocarpus  aNitrogenase  aCommon beans1 aFRANCO, A. A.1 aSPRENT, J. I.  tPlant and Soilgv. 149, p. 103-109, 1993.