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Mobilization of organic and poorly soluble phosphates by Chaetomium globosum [An article from: Applied Soil Ecology]
Book Details
Author(s)J.C. Tarafdar, A. Gharu
PublisherElsevier
ISBN / ASINB000RR9ROG
ISBN-13978B000RR9RO5
MarketplaceFrance 🇫🇷
Description
This digital document is a journal article from Applied Soil Ecology, published by Elsevier in 2006. The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
Description:
A phosphatase and phytase releasing fungus Chaetomium globosum was isolated and tested under green house conditions (wheat as test crop) and in the field (pearl millet as test crop) in a loamy sand soil. The population build up and efficiency were compared under both sterilized and non-sterilized soil conditions. The 68% organic phosphorus (Po) in the experimental soil was present as phytin; less than 1% of P was present in a plant available form. Exploitation of plant unavailable (poorly soluble) P was higher in sterilized soil mainly due to increased population of C. globosum. A gradual increase in microbial build up, between 7.5 and 16 times the inoculated population, occurred over a 4-week period. The test plants influenced acid phosphatase and phytase activity but resulted in no significant increase in alkaline phosphatase activity in the inoculated soil. The depletion of organic P was much higher than mineral P. The microbial contribution was significantly higher than the plant contribution to the hydrolysis of the different P fractions. The maximum effect of inoculation on different enzyme activities (acid phosphatase, alkaline phosphatase, phytase, dehydrogenase) was observed between 5 and 8 weeks of plant age. A significant improvement in plant biomass, root length, plant P concentration, seed and straw yield and seed P content resulted from inoculation. The results suggested that C. globosum produces phosphatases and phytases, which mobilize P and enhance the production of wheat and pearl millet crops.
Description:
A phosphatase and phytase releasing fungus Chaetomium globosum was isolated and tested under green house conditions (wheat as test crop) and in the field (pearl millet as test crop) in a loamy sand soil. The population build up and efficiency were compared under both sterilized and non-sterilized soil conditions. The 68% organic phosphorus (Po) in the experimental soil was present as phytin; less than 1% of P was present in a plant available form. Exploitation of plant unavailable (poorly soluble) P was higher in sterilized soil mainly due to increased population of C. globosum. A gradual increase in microbial build up, between 7.5 and 16 times the inoculated population, occurred over a 4-week period. The test plants influenced acid phosphatase and phytase activity but resulted in no significant increase in alkaline phosphatase activity in the inoculated soil. The depletion of organic P was much higher than mineral P. The microbial contribution was significantly higher than the plant contribution to the hydrolysis of the different P fractions. The maximum effect of inoculation on different enzyme activities (acid phosphatase, alkaline phosphatase, phytase, dehydrogenase) was observed between 5 and 8 weeks of plant age. A significant improvement in plant biomass, root length, plant P concentration, seed and straw yield and seed P content resulted from inoculation. The results suggested that C. globosum produces phosphatases and phytases, which mobilize P and enhance the production of wheat and pearl millet crops.
