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Salt stress induces a decrease in the oxygen uptake of soybean nodules and in their permeability to oxygen diffusion
Author(s) -
Serraj Rachid,
Roy Gérard,
Drevon Jean Jacques
Publication year - 1994
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1994.tb00414.x
Subject(s) - respiration , oxygen , chemistry , xylem , salinity , nodule (geology) , glycine , carbon dioxide , leghemoglobin , photosynthesis , botany , biophysics , biology , biochemistry , nitrogen , root nodule , nitrogen fixation , ecology , paleontology , organic chemistry , amino acid
The effects of short‐term NaCl‐salinity on nodules of soybean ( Glycine max L. cv. Kingsoy) were studied on hydroponically‐grown plants. Both acetylene reducing activity (ARA) and nodule respiration (O 2 uptake and CO 2 evolution) were immediately inhibited, and the stimulation of them by rising the external partial pressure of O 2 (pO 2 ) was diminished by the application of 0.1 M NaCl in the nutrient solution. The permeability of the nodule to O 2 diffusion, estimated by O 2 consumption or CO 2 evolution, was significantly lower in the stressed nodules than in the cootrol ones. The respiratory quotient of intact nodules and the ethanol production of excised nodules were increased by low pO 2 and by salt stress. These data confirm that in salt‐stressed soybean nodules, O 2 availability is reduced and fermentative pathways are stimulated.