US Patent 7109020 Leguminous bacterium having potentiated nitrogen fixation ability

The invention of this application provides root nodule bacteria transformed with the DNA fragment of SEQ ID No. 1 consisting a catalase gene and whose nitrogen-fixation ability is enhanced with a catalase produced from the catalase gene, a preparation for leguminous crops containing the root nodule bacteria as an active ingredient, and a method of cultivating leguminous crops which comprises contacting seeds of leguminous crops with these. These inventions enable the acceleration of growth of leguminous crops and multiplication of crop yield of beans. Further, the reduction of agricultural cost and the alleviation of environmental pollution are realized by the reduction of nitrogen fertilizers.