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Role of Arbuscular Mycorrhizal Association and Diversity of AM Fungi
In view of the paucity of data on mycorrhizal status and their functional roles in managed teak stands, an exhaustive survey was made during 1998-2002 in 70 teak plantations in different parts of Kerala State. The arbuscular mycorrhizal (AM) fungal association was detected in young feeder roots of all the sampled teak plants. However, the per cent root infection as well as species association varied with age of the plants and soil properties. The morphological diversity of AM fungal structures observed within the root samples indicated colonization by several AM fungal species. The overall extent of root colonization varied from 2 to 86 per cent with a mean of 32.42 per cent. The highest values were registered in root samples collected during the driest period. The pH, moisture content and nutrient status of the soil were found to influence the root colonization and distribution of spores in rhizosphere soil. The soil pH ranged from 4.03 to 7.96; and moisture content, from 0.31 to 19.33 per cent. Total nitrogen, phosphorus, organic carbon and exchangeable cations viz., Na, Ca, Mg and K, also showed high variation. In general, among various factors, soil pH, magnesium and sodium levels were found to influence the AM fungal colonization. The AM fungal spores retrieved from different soil samples ranged from 29 to 810 with a mean value of 216/10 g soil. The spore density and root infection showed a weak linear relation. Altogether, 85 species of Glomalean fungi belonging to six genera, viz., Glomus, Acaulospora, Gigaspora, Scutellospora, Sclerocystis and Entrophospora were recorded. The AM fungal community in teak soils consisted of 12-39 species with a mean spore density of 211.85 per sample plot. Among the AM fungi associated with teak, Glomus and Acaulospora were the most predominant genera. Relative abundance of AM fungi measured using Shannon-Wiener and Simpson’s indices ranged from 1.5532 to 3.0032 and 3.0508 to 16.6012, respectively. Gamma and beta diversity of AM fungi estimated were 98 and 69, respectively. The paper discusses possible functional role of AM fungi in improving the stand productivity.
We are one and only high yielding tissue culture teak producers in India & abroad
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BALAKRISHNA MUTHUKURI
MOTHER AGRI BIOTECH LABORATORIES INDIA PVT. LTD.
BANGALORE.
+919035003471
+919908286565
In view of the paucity of data on mycorrhizal status and their functional roles in managed teak stands, an exhaustive survey was made during 1998-2002 in 70 teak plantations in different parts of Kerala State. The arbuscular mycorrhizal (AM) fungal association was detected in young feeder roots of all the sampled teak plants. However, the per cent root infection as well as species association varied with age of the plants and soil properties. The morphological diversity of AM fungal structures observed within the root samples indicated colonization by several AM fungal species. The overall extent of root colonization varied from 2 to 86 per cent with a mean of 32.42 per cent. The highest values were registered in root samples collected during the driest period. The pH, moisture content and nutrient status of the soil were found to influence the root colonization and distribution of spores in rhizosphere soil. The soil pH ranged from 4.03 to 7.96; and moisture content, from 0.31 to 19.33 per cent. Total nitrogen, phosphorus, organic carbon and exchangeable cations viz., Na, Ca, Mg and K, also showed high variation. In general, among various factors, soil pH, magnesium and sodium levels were found to influence the AM fungal colonization. The AM fungal spores retrieved from different soil samples ranged from 29 to 810 with a mean value of 216/10 g soil. The spore density and root infection showed a weak linear relation. Altogether, 85 species of Glomalean fungi belonging to six genera, viz., Glomus, Acaulospora, Gigaspora, Scutellospora, Sclerocystis and Entrophospora were recorded. The AM fungal community in teak soils consisted of 12-39 species with a mean spore density of 211.85 per sample plot. Among the AM fungi associated with teak, Glomus and Acaulospora were the most predominant genera. Relative abundance of AM fungi measured using Shannon-Wiener and Simpson’s indices ranged from 1.5532 to 3.0032 and 3.0508 to 16.6012, respectively. Gamma and beta diversity of AM fungi estimated were 98 and 69, respectively. The paper discusses possible functional role of AM fungi in improving the stand productivity.
We are one and only high yielding tissue culture teak producers in India & abroad
*
*
BALAKRISHNA MUTHUKURI
MOTHER AGRI BIOTECH LABORATORIES INDIA PVT. LTD.
BANGALORE.
+919035003471
+919908286565
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