Record ID No. |
1858 |
Author(s) |
MarulandaAguirre A., Azcon R., RuizLozano J.M., Aroca R , 2008 |
Affiliation |
CSIC, Estac Expt Zaidin, Dept Microbiol Suelo & Sist Simbiot, C Profesor Albareda 1, Granada 18008, SPAIN |
Title |
Differential effects of a Bacillus megaterium strain on Lactuca sativa plant growth depending on the origin of the arbuscular mycorrhizal fungus coinoculated: Physiologic and biochemical traits |
Source. Vol.(no):Page |
Journal of Plant Growth Regulation.27(1):10-18p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
SPAIN, Europe |
Abstracts |
Coinoculation with plant growth-promoting rhizobacteria (PGPR) and arbuscular
mycorrhizal fungi (AMF) has been proposed as an efficient method to increase plant growth. In
this article we investigate how the interaction between three different AMF isolates (Glomus
constrictum autochthonous, GcA; G. Constrictum from collection, GcC; and commercial Glomus
intraradices, Gi) and a Bacillus megaterium strain isolated from a Mediterranean calcareous soil
affects Lactuca sativa L. Plant growth. Inoculation with B. Megaterium increased plant growth
when in combination with two of the AMF isolates (GcA and Gi), but decreased it when in
combination with GcC. At the same time, plants inoculated with the GcC fungus alone or in
combination with B. Megaterium (GcC+Bm) showed leaf symptoms of stress injury by accumulating
proline and reducing the amount of photosynthetic pigments, whereas the opposite occurred in
plants coinoculated with Gi fungus and B. Megaterium (Gi+Bm). GcC+Bm leaves also presented the
highest glucose-6-phosphate dehydrogenase (G6PDH) and the lowest glutamine synthetase (GS)
enzymatic activities, whereas Gi+Bm leaves showed the highest GS activity. Results on these
enzymatic activities are further discussed in relation to plant growth and performance. |