Vesicular-arbuscular mycorrhizal effectiveness in an acid soil amended with fresh organic matter

1993 ◽  
Vol 149 (2) ◽  
pp. 197-203 ◽  
Author(s):  
M. Soedarjo ◽  
M. Habte
Keyword(s):  
Organic Matter ◽  
Acid Soil ◽  
Arbuscular Mycorrhizal ◽  
Fresh Organic Matter ◽  
Mycorrhizal Effectiveness ◽  
Vesicular Arbuscular

Determining vesicular–arbuscular mycorrhizal effectiveness by monitoring P status of leaf disks

1987 ◽  
Vol 33 (12) ◽  
pp. 1097-1101 ◽  
Author(s):  
Taufiqul Aziz ◽  
Mitiku Habte
Keyword(s):  
Soil Solution ◽  
Arbuscular Mycorrhizal ◽  
Glomus Aggregatum ◽  
Symbiotic Interaction ◽  
Mycorrhizal Effectiveness ◽  
Vesicular Arbuscular ◽  
Before And After ◽  
Mycorrhizal Inoculation ◽  
Soil Solution P ◽  
Leaf Disks

A greenhouse experiment was conducted to monitor the development of symbiotic interaction between the vesicular–arbuscular mycorrhizal (VAM) fungus Glomus aggregatum and Vigna unguiculata grown in a typical Oxisol before and after the soil was subjected to simulated erosion and at various levels of phosphorus in the soil solution. VAM development monitored in terms of P status of cowpea leaf disks revealed that VAM activity was not detected in the eroded soil unless the soil was amended with P. When P was not limiting, VAM activity (effectiveness) was detected as early as 17 days from planting, the activity peaking 5–10 days thereafter. Peak VAM activity was observed at a soil solution P level of 0.026 μg/mL and the peak values were similar in the eroded and uneroded soil samples. Maximum mycorrhizal inoculation effect was also observed at this level of soil solution P. Our results illustrate the usefulness of the leaf-disk technique for monitoring the development of the VAM symbiosis and the significance of soil solution P in regulating host response to VAM inoculation.

Diazotroph establishment and maintenance in the Sorghum – Glomus – Azospirillum association

1989 ◽  
Vol 35 (11) ◽  
pp. 977-981 ◽  
Author(s):  
Raymond S. Pacovsky
Keyword(s):  
Organic Matter ◽  
Sorghum Bicolor ◽  
Azospirillum Brasilense ◽  
Arbuscular Mycorrhizal ◽  
Dry Weight ◽  
Glomus Etunicatum ◽  
Vesicular Arbuscular ◽  
Mycorrhizal Roots ◽  
Total Plant ◽  
Sorghum Bicolor L

Sorghum (Sorghum bicolor (L.) Moench cv. Bok 8) plants were grown in either a high peat or a low organic matter substrate and inoculated with a pigmented strain of Azospirillum brasilense (Cd). Half of the plants were also inoculated with the vesicular–arbuscular mycorrhizal (VAM) fungus Glomus etunicatum, while the remaining plants were fertilized with levels of phosphorus that had been found to be comparable to P input resulting from mycorrhizal colonization. Plants were harvested 1, 3, 5, and 7 weeks postemergence. Total plant dry weight was statistically similar (p > 0.05) between the two treatments for each substrate at all harvests. For each substrate, Azospirillum counts per gram of root were significantly (p < 0.05) higher in mycorrhizal roots at all harvests than in P-fertilized roots, and also higher in the high peat substrate compared with the low organic matter substrate. The ratio of the total number of inoculated A. brasilense cells in the Glomus-colonized compared to the P-fertilized roots was positively and significantly correlated (r = 0.81; p < 0.05) with % VAM colonization. Colonization of sorghum roots by G. etunicatum thus enhanced the establishment and persistence of A. brasilense in the endorhizosphere of sorghum.Key words: Azospirillum brasilense, endomycorrhizae, Glomus etunicatum, rhizosphere, Sorghum bicolor.

Occurrence of Vesicular-Arbuscular Mycorrhizal Fungi in Alberta, Canada

1993 ◽  
Vol 48 (11-12) ◽  
pp. 923-929 ◽  
Author(s):  
S. M. Boyetchko ◽  
J. P. Tewari
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Fungal Species ◽  
Glomus Aggregatum ◽  
X Ray ◽  
Vesicular Arbuscular ◽  
Spore Walls ◽  
Scanning Electron

Abstract Three V A mycorrhizal fungal species were isolated from soils in Alberta, Canada and examined by scanning electron microscopy and energy-dispersive X-ray microanalysis. Mature spores of Glomus aggregatum developed an outer hyaline wall which contained lower levels of calcium than the middle wall. Examination of G. pansihalos spores revealed a lower level of calcium in the outer evanescent wall as compared to the ornamented wall. When spores of Entrophospora infrequens were examined, the wall of the vesicle was found to contain similar levels of calcium as the ornamented wall of the spore. The significance of the results concerning the presence of calcium in mycorrhizal spore walls is discussed, as is the occurrence of the mycorrhizal species.

scholarly journals Impacts of soil moisture level and organic matter content on growth of two Juncus species and Poa pratensis grown under acid soil conditions

Weed Research ◽  
2019 ◽  
Vol 59 (6) ◽  
pp. 490-500
Author(s):  
W Kaczmarek‐Derda ◽  
M Helgheim ◽  
J Netland ◽  
H Riley ◽  
K Wærnhus ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Moisture ◽  
Poa Pratensis ◽  
Acid Soil ◽  
Organic Matter Content ◽  
Matter Content ◽  
Moisture Level ◽  
Soil Conditions ◽  
Soil Moisture Level
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