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Published in Soil Sci Soc Am J 22:527-528 (1958)
© 1958 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Role of the Root Nodule in the Bacterial-Induced Chlorosis of Soybeans1

Herbert W. Johnson and Francis E. Clark2

ABSTRACT

Plant grafting experiments with chlorosis-susceptible and chlorosis-resistant varieties of soybean, observations on a difficultly-nodulating experimental line, and isolations of bacteria from chlorotic plants were made in order to characterize more fully the bacterial-induced chlorosis of soybeans. The plant grafts showed that an interaction between susceptible rootstocks and specific rhizobia was responsible for the onset of chlorosis. Top growth of chlorosis-susceptible varieties showed no chlorosis when grown on resistant rootstocks; in the reverse graft, chlorotic top growth was obtained. Observations on the difficultly-nodulating line showed that chlorosis developed only after root nodules were formed. No invasion of the aboveground parts of chlorotic plants by root-nodule bacteria could be demonstrated. It was concluded that when certain strains of rhizobia invade and nodulate chlorosis-susceptible varieties of soybean, some growth-damaging or chlorophyll-inhibiting factor is formed in nodular tissue.

NOTES

1 Contribution from Crops and Soil and Water Conservation Research Divisions, ARS, USDA, Beltsville, Maryland. Presented before Div. III, Soil Science Society of America, Aug. 6, 1958, at Lafayette, Ind.

2 Research Agronomist and Microbiologist, respectively.

Received for publication March 6, 1958. Accepted for publication April 8, 1958.






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