Infectivity and effectiveness of vesicular arbuscular mycorrhizal fungi: effect of inoculum type

1981 ◽  
Vol 32 (4) ◽  
pp. 631 ◽  
Author(s):  
LK Abbott ◽  
AD Robson
Keyword(s):  
Root Length ◽  
Mycorrhizal Fungi ◽  
Early Stage ◽  
Phosphorus Uptake ◽  
Subterranean Clover ◽  
Arbuscular Mycorrhizal ◽  
Large Numbers ◽  
Infected Root ◽  
Vesicular Arbuscular ◽  
Inoculum Type

Plants, inoculated with four vesicular arbuscular mycorrhizal (VAM) fungi (Glomus fasciculatus, G. monospovus and two isolates of Acaulospova laevis), were grown from 4 to 16 weeks, and the development of infection and spores was followed. Infected roots from pot cultures of different ages were used to examine the effect of mycorrhiza development on the infectivity of each fungus. The effectiveness of each fungus was assessed by measuring its ability to increase the growth of subterranean clover on a phosphate-deficient soil. For all fungi, the percentage of root length infected increased rapidly up to 10 weeks after sowing, and thereafter it either increased only slightly or decreased. Infectivity of root inocula increased with increasing percentage of root length infected in the inoculum for all fungi, except where large numbers of mature spores (24/g infected root) had been produced by one isolate of A. laevis. The infectivity of inoculum roots from pots containing mature spores of this isolate declined rapidly, although it was not decreased by the onset of sporulation by A. laevis. For all fungi, irrespective of the inoculum used, the fresh weight of tops of subterranean clover grown on a phosphate-deficient soil was very closely correlated with the percentage of its root length infected at an early stage of plant growth. That is, the effectiveness of the species of fungi examined at increasing phosphorus uptake into plants was related to the infectivity of the inoculum used.

Vesicular-Arbuscular Mycorrhiza and Phosphorus Uptake of Chickpea Grown in Northern Syria

1992 ◽  
Vol 28 (4) ◽  
pp. 433-442 ◽  
Author(s):  
Edwin Weber ◽  
Eckhard George ◽  
Douglas P. Beck ◽  
Mohan C. Saxena ◽  
Horst Marschner
Keyword(s):  
Mycorrhizal Fungi ◽  
Field Experiments ◽  
Phosphorus Uptake ◽  
Arbuscular Mycorrhizal ◽  
P Uptake ◽  
Mycorrhizal Infection ◽  
P Fertilization ◽  
Flowering Stage ◽  
P Concentration ◽  
Vesicular Arbuscular

SUMMARYInoculation with vesicular-arbuscular mycorrhizal fungi (VAMF) improved growth of chick-pea (Cicer arielinum L.) and doubled phosphorus (P) uptake at low and intermediate levels of P fertilization in a pot experiment on sterilized low-P calcareous soil. In field experiments at Tel Hadya, northern Syria, growth, shoot P concentration and seed yield of spring-sown chickpea remained unaffected by inoculation with VAMF or by P fertilization. The mycorrhizal infection of chickpea was high (approximately 75% of root length mycorrhizal at the flowering stage) irrespective of inoculation with VAMF or P fertilization and may ensure efficient P uptake under field conditions.

Seasonal variation in infectivity of vesicular-arbuscular mycorrhizal fungi in relation to plant response to applied phosphorus

Soil Research ◽  
1983 ◽  
Vol 21 (2) ◽  
pp. 207 ◽  
Author(s):  
NS Bolan ◽  
LK Abbott
Keyword(s):  
Seasonal Variation ◽  
Plant Growth ◽  
Soil Sample ◽  
Mycorrhizal Fungi ◽  
Response Curve ◽  
Subterranean Clover ◽  
Arbuscular Mycorrhizal ◽  
Mycorrhizal Infection ◽  
Virgin Forest ◽  
Vesicular Arbuscular

The effect of applied phosphorus on the growth of subterranean clover was studied in a virgin forest soil sample collected in summer and again in spring. The soil sample was used soon after it was collected. The shape of the response curve for plant growth differed greatly in the two experiments. This may be related to the presence of vesicular-arbuscular mycorrhizal infection in plants grown in the soil sample collected in summer and its absence in the soil sample collected in spring.

scholarly journals Root Architecture, Yield and Phosphorus Uptake by Rice: Response to Rock Phosphate Enriched Compost and Microbial Inoculants

2020 ◽  
pp. 33-39
Author(s):  
Kasturikasen Beura ◽  
Amit Kumar Pradhan ◽  
G. K. Ghosh ◽  
Anshuman Kohli ◽  
Mahendra Singh
Keyword(s):  
Root Length ◽  
Mycorrhizal Fungi ◽  
Root Biomass ◽  
Root Architecture ◽  
Rock Phosphate ◽  
Cropping Systems ◽  
Phosphorus Uptake ◽  
Arbuscular Mycorrhizal ◽  
Rice Crop ◽  
Microbial Inoculants

There is relatively little information about root architecture response under various cropping systems. This research concerns the influence of rock phosphate enriched compost and microbial inoculants on root morphology and root colonization through Arbuscular Mychorrhizal fungi under rice crop. In this study, we estimated the root length (RL), root biomass (RB), mychorrizal root infection, crop yield and phosphorus uptake in grain and straw. Root samples were collected after harvesting of crop located at Instructional farm of Bihar. Root parameters including root length (18.14 cm) and dry root biomass (0.93 g) were observed to be significantly higher in the treatments inoculated with Arbuscular mycorrhizal fungi over control (statistically at par but numerically higher than 100% RDF) because of the hyphal extensions leading to increased reach and surface area of roots in rice crop. Highest uptake of P by the grain and straw of rice (13.78 and 11.03 kgha-1) was recorded with the combined application of chemical fertilizers with rock phosphate enriched compost in the presence of microbial inoculants like PSB and AMF.

Introduction of vesicular arbuscular mycorrhizal fungi into agricultural soils

1983 ◽  
Vol 34 (6) ◽  
pp. 741 ◽  
Author(s):  
LK Abbott ◽  
AD Robson ◽  
IR Hall
Keyword(s):  
Mycorrhizal Fungi ◽  
Agricultural Soils ◽  
Subterranean Clover ◽  
Arbuscular Mycorrhizal ◽  
Temporary Increase ◽  
Indigenous Species ◽  
Previous Survey ◽  
Rate Of Development ◽  
Vesicular Arbuscular ◽  
Va Mycorrhizal Fungi

Two species of vesicular arbuscular (VA) mycorrhizal fungi were introduced into agricultural soils at four field sites. Three sites were chosen, on the basis of a previous survey, to give a range in the expected extent and rate of mycorrhizal formation by the indigenous fungi. The fourth site had recently been cleared of natural vegetation and ploughed. The success of inoculation with Glomus fasciculatum and G. monosporum was measured by estimating the extent of mycorrhizas formed by the inoculant fungi and by recording growth of subterranean clover. The effects of inoculating with these two mycorrhizal fungi on the development of mycorrhizas formed by the indigenous fungi were also followed in detail. At two sites, infection by G. fasciculatum was increased in the plots where this species was added in the inoculum. Growth was temporarily enhanced after inoculation with G. fasciculatum at one of these sites. This corresponded with a temporary increase in the percentage of root length infected as a result of inoculation. Plants grown at the two sites where G. fasciculatum became established had a slower rate of development of infection by the indigenous VA mycorrhizal fungi compared with that formed by the indigenous species at the other two sites.

The Effect of Surface Mining on the Infectivity of Vesicular-Arbuscular Mycorrhizal Fungi

1987 ◽  
Vol 35 (6) ◽  
pp. 641 ◽  
Author(s):  
DA Jasper ◽  
AD Robson ◽  
LK Abbott
Keyword(s):  
Mycorrhizal Fungi ◽  
Surface Mining ◽  
Subterranean Clover ◽  
Arbuscular Mycorrhizal ◽  
Mining Operation ◽  
Soil Disturbance ◽  
Inoculum Potential ◽  
Vesicular Arbuscular ◽  
Va Mycorrhizal Fungi ◽  
Mine Sites

We tested the hypothesis that soil disturbance associated with mining will reduce the infectivity of propagules of vesicular-arbuscular (VA) mycorrhizal fungi to different extents, depending on the mining operation and the environment. At each of four mine sites, the infectivity of VA mycorrhizal fungi was estimated in soil from native vegetation, disturbed topsoil and revegetated soil. Infectivity was measured using subterranean clover and Acacia species as bioassay plants. In a second experiment the effects of soil disturbance and soil storage on infectivity of VA mycorrhizal fungi were measured separately. Topsoil disturbance decreased the number of spores or the number of spore types that could be isolated from the soil, and reduced or delayed formation of VA mycorrhizas. Glasshouse treatments indicated that both disturbance and a period of storage without plant growth contributed to the loss in infectivity of propagules of VA mycorrhizal fungi. After 4-5 years of revegetation, the number of infective propagules appears to be restored to a level equivalent to that of undisturbed soils. The possibility of improving revegetation by increasing the inoculum potential of disturbed soils needs to be investigated.

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