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Endorhizal and exorhizal acetylene reducing activity in a grass spartina alterniflora diazotroph association



Endorhizal and exorhizal acetylene reducing activity in a grass spartina alterniflora diazotroph association



Plant Physiology (Rockville) 66(2): 276-280



Bacteria responsible for nitrogenase activity of some grasses are apparently located inside the roots. Those studies were conducted with excised roots in which a long, unexplained lag phase occurred before initiation of nitrogenase activity. When hydroponically maintained, S. alterniflora Loisel. was incubated in a 2-compartment system with acetylene; ethylene was produced following, at most, a 2 h lag in both the upper (shoot) and lower (roots + water) phases. Ethylene production in the upper phase not attributable to leaf-associated acetylene-reducing activity or to diffusion of ethylene from around the roots is considered to represent "endorhizal acetylene-reducing activity"; the internally produced ethylene diffusing into the upper phase via the lacunae. Ethylene produced in the lower phase is designated exorhizal acetylene-reducing activity. The endorhizal acetylene-reducing activity, in comparison to exorhizal activity, was relatively insensitive to additions of HgCl2, NH4Cl, or C sources to the lower phase. Post-lag acetylene-reducing activity of roots excised from plants growing in soil responded to additions in a manner similar to that of endorhizal acetylene-reducing activity, whereas post-lag acetylene-reducing activity of rhizosphere soil responded in a manner similar to that of exorhizal acetylene-reducing activity.

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Accession: 005359010

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