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Srimathi Priya, L.
- Effect of Co-Inoculation of am Fungus Scutellospora Sp. and Fluorescent Pseudomonas on Coleus forskohlii
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1 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641 039, IN
1 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore 641 039, IN
Source
Journal of Biological Control, Vol 27, No 2 (2013), Pagination: 110–115Abstract
An investigation was carried out with the aim to study the interactive effect of Arbuscular Mycorrhizal (AM) fungi and Plant Growth Promoting Rhizobacteria (PGPR), Pseudomonas on growth and yield of Coleus forskohlii. The inoculation of AM fungus, Scutellospora sp. and PGPR organisms (Pseudomonas sp.) showed increase in plant enzyme activities along with enhancement in tuber yield and alkaloid content, than the individual treatments. The combined inoculation of the AM fungus with PGPR recorded maximum shoot and ischolar_main length with 40.4 and 203.1 per cent increase over control and the total dry matter content increased by 104.5 percent over control. The enzyme activities (acid, alkaline and dehydrogenase) were found to have enhanced upto 200 per cent due to the combined inoculation of SCL1+PFC1 which was double than single inoculations. The AM colonization (45-90 per cent) and spore load (155–330 spores) were also higher due to these treatments while, about 6-7, 1-2 and 5-6 fold increase in N, P and K uptake was noticed respectively. The tuber yield (0.73 g plant-1) and forskohlin content (0.03-0.06 per cent) were also found to be doubled due to the inoculation of AM fungi with PGPR.Keywords
Arbuscular Mycorrhizal (AM) Fungi, Plant Growth Promoting Rhizobacteria (PGPR), Coleus forskohlii, Forskohlin Content.Full Text
References
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- Screening of Diazotrophic Bacterial Communities from Wild Rice (Oryza indica) and Cultivated Rice (Oryza sativa) and their Plant Growth Promoting Activities
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Authors
Affiliations
1 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, T.N, IN
2 Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, T.N, IN
1 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore, T.N, IN
2 Department of Soil Science and Agricultural Chemistry, Tamil Nadu Agricultural University, Coimbatore, T.N, IN
Source
Asian Journal of Bio Science, Vol 8, No 1 (2013), Pagination: 63-68Abstract
A study was undertaken to screen the free living, culturable diazotrophic bacteria from wild rice (Oryza indica) and cultivated rice (Oryza sativa) and their plant growth promoting activities. Out of forty eight diazotrophic isolates, thirty eight isolates recorded positive growth in Nfree medium which were further analyzed for total nitrogen and ammonia. Based on total nitrogen and ammonia production, twenty eight diazotrophic isolates were selected for nitrogenase activity. The highest nitrogenase activity was exhibited by isolate GDR16 (413456.6 nm of ethylene mg-1 protein-1 hr). For PGPR activity 11 isolates from O.indica and 9 isolates from O.sativa with elite nitrogenase activity were selected for PGPR as well as mineral solubilization studies. Out of these 20 diazotrophic isolates, 11 isolates showed IAA production. The maximum amount of IAA was produced by CBE1 (35.5 1.14g ml-1). The highest amount of GA was produced by GDR13 (21.70.19 g ml-1), followed by GDR 7 which produced 18.40.23 g ml-1. The maximum siderophore production was recorded with CBE1 (43.94 0.64g mg-1 dry weight of cell of catechol type). With respect to mineral solubilization, 17 were able to solubilze the insoluble phosphorus and 7 were able to solubilze the zinc. The results of the present study showed the diazotrophic bacteria associated to both wild and cultivated rice and it having variety of plant growth promoting substances in considerable amounts apart from diazotrophy.Keywords
Rice, Diazotrophs, Oryza Indica, Oryza Sativa, Pgpr
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- Influence of Surface Sterilization and Cold Treatment on Germination of AM Spores
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Authors
Affiliations
1 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN
1 Department of Agricultural Microbiology, Tamil Nadu Agricultural University, Coimbatore (T.N.), IN