Glycine-Glomus-Bradyrhizobium symbiosis. X. Relationships between leaf gas exchange and plant and soil water status in nodulated, mycorrhizal soybean under drought stress

Soybean (Glycine max [L.] Merr.) plants were colonized by the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus mosseae (Nicol. and Gerd.) Gerd. and Trappe (VAM plants) or fertilized with KH2PO4 (nonVAM plants) and grown for 50 days under controlled conditions. Plants were harvested over a 4-day...

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Bibliographic Details
Published in:Plant physiology (Bethesda) 1990-10, Vol.94 (2), p.723-728
Main Authors: Bethlenfalvay, Gabor J., Milford S. Brown, Raymond L. Franson
Format: Article
Language:English
Subjects:
Agricultural soils
Biological and medical sciences
Bradyrhizobium
Dehydration
Drought
drought stress
echange gazeux
estres de sequia
feuille
formation de nodosites
Fundamental and applied biological sciences. Psychology
gas exchange
glomus
Glycine max
hojas
intercambio de gases
leaves
Moisture content
nodulacion
Parasitism and symbiosis
Plant physiology and development
Plant roots
Plants
potentiel hydrique
root nodulation
secheresse
sequia
simbiosis
Soil water
Soil water content
Soybeans
stress du a la secheresse
symbiose
Symbiosis
tension de absorcion
Transpiration
water potential
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Summary:Soybean (Glycine max [L.] Merr.) plants were colonized by the vesicular-arbuscular mycorrhizal (VAM) fungus Glomus mosseae (Nicol. and Gerd.) Gerd. and Trappe (VAM plants) or fertilized with KH2PO4 (nonVAM plants) and grown for 50 days under controlled conditions. Plants were harvested over a 4-day period during which the soil was permitted to dry slowly. The harvest was terminated when leaf gas exchange was no longer measurable due to drought stress. Significantly different effects in shoot water content, but not in shoot water potential, were found in VAM and nonVAM plants in response to drought stress. Leaf conductances of the two treatments showed similar response patterns to changes in soil water and shoot water potential but were significantly different in magnitude and trend relative to shoot water content. The relationships between transpiration, CO2 exchange and water-use efficiency (WUE) were the same in VAM and nonVAM plants in response to decreasing soil water and shoot water potential. As a function of shoot water content, however, WUE showed different response patterns in VAM and nonVAM plants.
ISSN:0032-0889
1532-2548
DOI:10.1104/pp.94.2.723