caa a22 4500 469076070 CHVBK 20180323132935.0 cr unu---uuuuu 170328e19920801xx s 000 0 eng 10.1007/BF02927872 doi (NATIONALLICENCE)springer-10.1007/BF02927872 Rhizobium meliloti purine auxotrophs are nod + but defective in nitrogen fixation [Elektronische Daten] [S. Swamynathan, Aqbal Singh] Several purine auxotrophs were isolated inRhizobium meliloti and characterized for their nutritional requirements. They were found to produce small, irregular nodules lacking any detectable nitrogenase activity onMedicago sativa. The symbiotic aberration manifests itself only in the late developmental stage, for, (i) these purine auxotrophs infect theMedicago sativa root hairs by forming normal infection threads, and (ii) the mutants are recovered from the root nodules induced by them. External supplementation of the plant growth substrate with purines or their biosynthetic intermediates fails to restore symbiosis. This, and the failure of complementation of these auxotrophs with the known symbiotic genes, demonstrates that these mutants perhaps define a new set of genes influencing the symbiotic process inRhizobium meliloti. Indian Academy of Sciences, 1992 Rhizobium meliloti nationallicence Medicago sativa nationallicence purine biosynthesis nationallicence auxotrophs nationallicence symbiosis nationallicence Swamynathan S. Biotechnology Centre, Indian Agricultural Research Institute, 110012, New Delhi, India aut Singh Aqbal Biotechnology Centre, Indian Agricultural Research Institute, 110012, New Delhi, India aut Journal of Genetics Springer India 71/1-2(1992-08-01), 11-21 0022-1333 71:1-2<11 1992 71 12041 https://doi.org/10.1007/BF02927872 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02927872 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Swamynathan S. Biotechnology Centre, Indian Agricultural Research Institute, 110012, New Delhi, India aut NATIONALLICENCE 700 1- Singh Aqbal Biotechnology Centre, Indian Agricultural Research Institute, 110012, New Delhi, India aut NATIONALLICENCE 773 0- Journal of Genetics Springer India 71/1-2(1992-08-01), 11-21 0022-1333 71:1-2<11 1992 71 12041 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer