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Published in Crop Sci 23:453-456 (1983)
© 1983 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effect of Rhizobium japonicum Mutants with Enhanced N2 Fixation Activity on N Transport and Photosynthesis of Soybeans during Vegetative Growth1

Richard J. Thomas2, Kari Jokinen3 and Larry E. Schrader4

The effects of two mutant strains of Rhizobium japonicum with enhanced capacities 2fixation, on ureide transport, photosynthesis,root respiration, and growth in soybeans [Glycine max (L.) Merr. ‘Wells’] were examined during vegetative growth. Three-week-old plants inoculated with the mutants were larger and had higher rates of acetylene reduction, photosynthesis, xylary ureide transport, leaf allantoinase activity and higher concentrations of ureides in shoot tissues than did plants inoculated with the wild-type strain. The relative composition of xylem sap N was unaffected by Rhizobium strain. Ureides comprised over 90% of the sap N in all treatments. After 5 weeks growth, however, there were no statistically significant differences among treatments in rates of the physiological processes and growth parameters examined. Cross contamination of nodules containing the mutant strains with the wild-type strain was not responsible for the apparent loss of the initial advantages to the host plant (in terms of N2 fixation and growth) brought about by the use of the mutant strains. The use of modifications in Rhizobium genetics for improving the dependency of the host plant on N2 fixation for its N requirements is briefly discussed.

Key Words: Glycine max • Ureide transport • Root respiration • Allantoinase

1 Contribution of the Dep. of Agronomy, Wisconsin Agric. Exp. Stn., Madison, Research supported by the College of Agric. and Life Sciences, Univ. of Wisconsin-Madison, and by Allied Chemical Corp.

2 Former research associate; presently in Dep. of Biological Sciences, Univ. of Dundee, Dundee DD1 4HN Scotland.

3 Former laboratory assistant, presently in Dep. of Agronomy, Univ. of Helsinki, Viikki, 00710 Helsinki 71 Finland.

4 Professor of plant physiology, Dep. of Agronomy, Univ. of Wisconsin, Madison, WI 53706.

Received for publication July 26, 1982.




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