Physiological responses of soybean plants grown in a nitrogen-free or energy limited environment.
Soybean (Glycine max [L.] Merr.) seedlings grown in the absence of combined N and in an Ar:O(2) (79:21, volume/volume) atmosphere had greater seedling and nodule mass, threefold higher acetylene reducing activity per gram fresh weight nodules, no observable increase in nitrogenase Fe-protein, and a higher energy charge than did control plants. A sharp fall in acetylene reducing activity and energy charge accompanying stem-girdling was prevented by exogenous succinate, a result consistent with a path from the roots to the nodule other than via the phloem.
Zhu
Y X
YX
Biology Department, Washington University, St. Louis, Missouri 63130.
Schubert
K R
KR
Kohl
D H
DH