ISSN:
1573-5036
Keywords:
Albizia julibrissin
;
gas chromatography
;
Mimos pudica
;
organic sulfides
;
potting soil
;
soil gases
Source:
Springer Online Journal Archives 1860-2000
Topics:
Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
Notes:
Abstract Conditions under which some plants emit carbon disulfide (CS2) in the soil are unknown. A pot assembly was constructed to measure soil CS2 emissions by Mimosa pudica under conditions of undisturbed growth, root injury, and drought stress. When M. pudica was grown without disturbance, soil CS2 emissions were below the limit of detection (≤0.1 ng CS2 mL−1) for the entire 8-wk sampling period. However, when the roots of 6-wk-old M. pudica plants were cut to a depth of 10 cm, a maximum of 0.5 and 0.4 ng CS2 mL−1 was emitted within minutes at the 5- and 10-cm depths, respectively. These emissions declined slowly to undetectable levels after 50 min. No detectable CS2 emissions were observed at the 0- and 15-cm depths. No CS2 was emitted when 6-wk-old M. pudica plants were subjected to drought stress, however, when the same plants were watered, a maximum of 0.3, 0.4, and 0.5 ng CS2 mL−1 was emitted within minutes at the 5-, 10- and 15-cm depths, respectively. These emissions were detectable for at least 2 hr at the 10- and 15-cm depths. No detectable CS2 emissions were observed at the 0-cm depth after watering. No detectable CS2 emissions were observed at any depth under any conditions of undisturbed growth, root injury, or drought stress followed by watering for assemblies containing either no plants or Albizia julibrissin, a plant that is closely related to M. pudica but does not emit CS2. Mimosa pudica emitted detectable CS2 under conditions of root injury and rewetting of dry soil but not under conditions of undisturbed growth. Release of such a biocidal sulfide only during conditions of root injury or rewetting of dry soil would be advantageous to M. pudica.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00012864
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