Abstract:
:Cobalt was shown to be essential for the symbiotic growth of Azolla filiculoides and Anabacna azollac in the absence of fixed nitrogen. Addition of 0.01 mug/liter cobalt resulted in large increases in yield, chlorophyll content and nitrogen fixation as compared to control cultures without cobalt. Cobalt was not required for the growth of Azolla when nitrate nitrogen was supplied. The number of Anabaena azollae cells in the fronds of Azolla appeared to be decreased by ommission of cobalt from the culture medium containing nitrate nitrogen. It is concluded that cobalt is essential for the symbiotic growth of Azolla in the absence of combined nitrogen and it is suggested that the cobalt requirement is associated with the growth of Anabaena azollae.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Johnson GV,Mayeux PA,Evans HJdoi
10.1104/pp.41.5.852subject
Has Abstractpub_date
1966-05-01 00:00:00pages
852-5issue
5eissn
0032-0889issn
1532-2548journal_volume
41pub_type
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