Abstract
IT has been established1 that cobalt is an essential element for the symbiotic growth of soybean plants and Rhizobium japonicum in a purified solution lacking-combined nitrogen. It has been shown also that cobalt is needed for alfalfa inoculated with Rhizobium meliloti2. Legumes supplied with adequate fixed nitrogen do not respond to additions of cobalt1,2; but R. japonicum, R. meliloti, R. leguminosarum, R. trifolii, and R. phaseoli cultured in a purified medium containing both ammonium and nitrate nitrogen failed to grow normally without cobalt3,4. The vitamin B12 content of root nodules from soybean plants is positively correlated with the cobalt supply in the nutrient medium1, suggesting that an important role of this element in nodule metabolism is related to that of the vitamin.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
