Department of Botany and Plant Pathology, Oregon State University, Corvallis, Oregon.
Plant Physiol. 1966 May;41(5):852-5. doi: 10.1104/pp.41.5.852.
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.
钴被证明对在缺乏固定氮的情况下共生生长的满江红和满江红中的鱼腥藻是必需的。与不含钴的对照培养物相比，添加 0.01 微克/升的钴可导致产量、叶绿素含量和固氮作用大大增加。当供应硝酸盐氮时，钴不是满江红生长所必需的。从含有硝酸盐氮的培养基中省略钴似乎会减少满江红叶片中的鱼腥藻细胞数量。因此，结论是钴是在缺乏结合氮的情况下满江红共生生长所必需的，并且钴的需求与鱼腥藻的生长有关。
