Plant Growth Promoting Rhizobacteria and Soybean [ Glycine max (L.) Merr.] Nodulation and Nitrogen Fixation at Suboptimal Root Zone Temperatures |
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Authors: | ZHANG FENG; DASHTI NARJES; HYNES R K; SMITH DONALD L |
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Institution: | Department of Plant Science, Macdonald Campus of McGill University 21, 111 Lakeshore Road, Ste. Anne de Bellevue, Quebec, H9X 3V9, Canada Cominco Fertilizers Ltd., Ag Biologicals, 402-15 Innovation Boulevard, Saskatoon, SK, S7N 2X8, Canada |
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Abstract: | Co-inoculation of plant growth promoting rhizobacteria (PGPR)withBradyrhizobium has been shown to increase legume nodulationand nitrogen fixation at optimal soil temperatures. Nine rhizobacteriaco-inoculated withBradyrhizobium japonicum532C were tested fortheir ability to reduce the negative effects of low root zonetemperature (RZT) on soybean Glycine max(L.) Merr.] nodulationand nitrogen fixation. Three RZTs were tested: 25 (optimal),17.5 (somewhat inhibitory), and 15°C (very inhibitory).At each temperature some PGPR strains increased the number ofnodules formed and the amount of fixed nitrogen when co-inoculatedwithB. japonicum,but the stimulatory strains varied with temperatures.The strains that were most stimulatory varied among temperaturesand were as follows: 15°C,Serratia proteamaculans 1-102;17.5°C,S. proteamaculans 1-102andAeromonas hydrophilaP73;25°C,Serratia liquefaciens2-68. Bradyrhizobium japonicum ; Glycine max; plant growth promoting rhizobacteria; suboptimal root zone temperatures |
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