Record ID No. |
184 |
Author(s) |
Auge R. M., Moore J. L., Sylvia D. M., Cho K. H. , 2004 |
Affiliation |
University of Tennessee, Department of Plant Sciences, 2431 Center Drive, Knoxville, TN 37996 |
Title |
Mycorrhizal promotion of host stomatal conductance in relation to irradiance and temperature |
Source. Vol.(no):Page |
Mycorrhiza. 14(2): 85-92 p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Photosynthesis |
Host |
Sorghum |
Organism |
Gigaspor margarita |
Country |
U.S.A., North America |
Abstracts |
Colonization of roots and soil by arbuscular
mycorrhizal (AM) fungi sometimes promotes stomatal conductance
(g(s)) of the host plant, but scientists have had difficulty
predicting or manipulating the response. Our objective was to
test whether the magnitude of AM influence on g(s) is related to
environmental conditions: irradiance, air temperature or leaf
temperature. Stomatal conductances of two groups of uncolonized
sorghum plants were compared to g(s) of plants colonized by
Glomus intraradices (Gi) or Gigaspora margarita (Gm) in 31
morning and afternoon periods under naturally varying greenhouse
conditions. Stomatal conductance of Gi and Gm plants was often
markedly higher than g(s) of similarly sized nonAM plants. AM
promotion of g(s) was minimal at the lowest irradiances and
lowest air and leaf temperatures, but was substantial at
intermediate irradiance and temperatures. AM promotion was again
low or absent at the highest irradiances and temperatures.
Magnitude of AM promotion of g(s) was not a function of absolute
g(s). Promotion of gs by Gi and Gm was remarkably similar.
Differing phosphorus fertilization did not affect g(s). |