scholarly journals Polar Transport Characteristics of Radiostrontium and Radiocalcium in Isolated Corn Root Segments

1967 ◽  
Vol 42 (5) ◽  
pp. 747-750 ◽  
Author(s):  
Burton E. Vaughan ◽  
Evan C. Evans ◽  
Maxine E. Hutchin
Planta ◽  
1977 ◽  
Vol 135 (1) ◽  
pp. 1-5 ◽  
Author(s):  
Kathryn L. Edwards ◽  
T. K. Scott

Planta ◽  
1974 ◽  
Vol 119 (1) ◽  
pp. 27-37 ◽  
Author(s):  
Kathryn L. Edwards ◽  
Tom K. Scott

1976 ◽  
Vol 57 (2) ◽  
pp. 137-141 ◽  
Author(s):  
W. P. Anderson ◽  
Noe Higinbotham
Keyword(s):  

1981 ◽  
Vol 59 (12) ◽  
pp. 2445-2449 ◽  
Author(s):  
Pedro Antonio A. Pereira ◽  
José Ivo Baldani ◽  
Johanna Döbereiner ◽  
Carlos A. Neyra

Root segments obtained from field-grown corn plants were divided into small sections and assayed for acetylene (C2H2) reduction. After overnight preincubation, C2H2 reduction started immediately and linear rates were observed for several hours. Addition of NO3− (1 mM) delayed the start of C2H2 reduction but linear rates followed thereafter. A similar pattern was observed with excised roots inoculated with Azospirillum lipoferum.Addition of malate did not eliminate the NO3− effect. Inoculation with A. lipoferum resulted in relatively large rates of C2H2 reduction and a shorter lag than normal (4 to 8 h). A transient accumulation of NO2− accompanied the disappearance of NO3− and C2H2 reduction started only after all the NO2− had been reduced. A very sizable fraction of the reduced NO3− and NO2− was accounted for as N2O accumulation. Thus, the results provided support for the in situ operation of both N2 fixation and denitrification in A. lipoferum – corn root associations and it is proposed that mature corn roots are able to provide sufficient carbon to support both processes.


1989 ◽  
Vol 979 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Rémy Gibrat ◽  
Jean-Pierre Grouzis ◽  
Jacqueline Rigaud ◽  
Nathalie Galtier ◽  
Claude Grignon

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