Interaction of vesicular arbuscular mycorrhiza with root knot nematodes in tomato
ABSTRACT The interaction between the VA mycorrhizal fungus,Glomus fasciculatus and the root-knot nematodes,Meloidogyne incognita andM. javanica, and their effects on the growth and phosphorus nutrition of tomato was studied in a red sandy loam soil of pH 6.0. Inoculation of tomato roots with root-knot nematodes enhanced infection and spore production byG. fasciculatus. Inoculation of tomato plants withG. fasciculatus significantly reduced the number and size of the root-knot galls produced byM. incognita andM. javanica. Inoculation withG. fasciculatus although improved plant growth and its total phosphorus content compared to the uninoculated plants, the difference were not statistically significant.
- SourceAvailable from: Mohd Sayeed Akhtar[Show abstract] [Hide abstract]
ABSTRACT: The effects of root-associated fungi (Aspergillus awamori and Glomus mosseae) and plant growth promoting rhizobacteria (PGPR) (Pseudomonas putida, Pseudomonas alcaligenes and Paenibacillus polymyxa) were studied alone and in combination in glasshouse experiments on the growth of pea, enzyme activity (peroxidase and catalase) and reproduction of root-knot nematode Meloidogyne incognita. Application of A. awamori, G. mosseae and PGPR caused a significant increase in pea growth and enzyme activities of both nematode inoculated and uninoculated plants. A. awamori was more effective in reducing galling and improving the growth of nematode inoculated plants than P. alcaligenes or P. polymyxa. The greatest increase in growth, enzyme activities of nematode-inoculated plants and reduction in galling and nematode multiplication was observed when A. awamori was used with P. putida or G. mosseae as compared to the other combinations tested. Percentage root colonization was higher when AM fungus inoculated plants were treated with P. putida both in presence and absence of nematode. (© 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim).Journal of Basic Microbiology 04/2013; 53(4):318-326. · 1.20 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: The effects of Glomus intraradices, Rhizobium sp. and Pseudomonas straita on the root-rot disease complex of chickpea caused by Meloidogyne incognita and Macrophomina phaseolina were observed. Inoculation of G. intraradices, P. straita and Rhizobium caused a significant increase in plant growth, number of pods, chlorophyll, nitrogen, phosphorus and potassium contents of pathogen-inoculated plants. Inoculation of Rhizobium caused a greater increase in plant growth, number of pods, chlorophyll, nitrogen, phosphorus and potassium contents of pathogen-inoculated plants than caused by P. straita or G. intraradices. Combined inoculation of G. intraradices with P. straita plus Rhizobium to pathogen-inoculated plants caused greater increase in plant growth, number of pods, chlorophyll, nitrogen, phosphorus and potassium contents than by inoculation of G. intraradices plus Rhizobium or G. intraradices plus P. straita. The numbers of nodules per root system were significantly higher in plants inoculated with Rhizobium compared with uninoculated ones. Inoculation of Rhizobium with P. straita/G. intraradices further increases nodulation per root system over plants inoculated with Rhizobium alone. Root colonization by G. intraradices was high in plants inoculated alone. In the presence of P. straita and Rhizobium, root colonization by G. intraradices was increased, while inoculation of pathogens reduced colonization by G. intraradices. Inoculation of Rhizobium caused higher reduction in galling and nematode multiplication, followed by P. straita and G. intraradices. Maximum reduction in galling and nematode multiplication was observed when G. intraradices was inoculated with both bacteria. Biocontrol of root-rot disease complex of chickpea may be achieved by the combined use of Rhizobium, G. intraradices and P. straita or use of Rhizobium plus P. straita.Crop Protection 03/2008; 27:410-417. · 1.54 Impact Factor
- [Show abstract] [Hide abstract]
ABSTRACT: Mycorrhizal fungi increase soil nutrient and water absorption as plant symbionts. Root nodule bacteria, beside fixing atmospheric nitrogen, have the ability to produce antibiotics and phytoalexins, etc. The use of these two symbionts together appears to be more beneficial for plant growth than their use individually. The results of most studies indicate that mycorrhizal fungi and root-nodule bacteria generally reduce the severity of nematode diseases of various crops. There are possibilities for biological control of nematodes by selecting effective strains of mycorrhizal fungi and root-nodule bacteria, despite some obstacles.Bioresource Technology 01/1995; 54:217-226. · 5.04 Impact Factor