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Annals of Botany 77: 453-460, 1996
© 1996 Annals of Botany Company

Plant Growth Promoting Rhizobacteria and Soybean [ Glycine max (L.) Merr.] Nodulation and Nitrogen Fixation at Suboptimal Root Zone Temperatures

FENG ZHANG, NARJES DASHTI, R. K. HYNES and DONALD L. SMITH+

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

June 5, 1995 ; November 6, 1995

Co-inoculation of plant growth promoting rhizobacteria (PGPR) withBradyrhizobium has been shown to increase legume nodulation and nitrogen fixation at optimal soil temperatures. Nine rhizobacteria co-inoculated withBradyrhizobium japonicum532C were tested for their ability to reduce the negative effects of low root zone temperature (RZT) on soybean [Glycine max(L.) Merr.] nodulation and 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 of nodules formed and the amount of fixed nitrogen when co-inoculated withB. japonicum,but the stimulatory strains varied with temperatures. The strains that were most stimulatory varied among temperatures and 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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