ISSN:
1432-072X
Keywords:
Nitrogen fixation
;
Root nodule
;
Endophyte vesicle
;
Alder
;
Alnus
;
Freeze-etching
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Nitrogen-fixing root nodules of Alnus crispa var. mollis Fern. were studied by transmission electron microscopy and by freeze-etching technique. Ultrathin sectioning of septate vesicles of the actinomycetal endophyte showed an electron transparent zone, the so-called “void area”, between the vesicle cell wall and its encapsulation material. This void area was not observed in the freeze-etching replicas of cryoprotected nodular tissue. It is suggested that the void area is the result of the coming-off of the vesicle cell wall from the capsule and that its formation reflects difficulty in fixing the voluminous mature vesicle of the root nodule endophyte.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00425337
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