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| जनमोर्चा(8 अप्रैल, 2015) |
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Thursday, 17 December 2015
STUDIES ON CERTAIN ASPECTS OF ROOT SURFACE FUNGI. I
The present study deals with the succession of fungi on the root regions of living Pennisetum typhoides (Burm f.) Stapf. et Hubb. from July to November of 1970 and 1971. A clear succession of fungi from nonrhizosphere - rhizosphere - cortical portion of rhizoplane - steler portion of rhizosplane has been observed. The fungal population and number of species in the crown, middle and distal regions of roots in above mentioned four regions also exhibited a definite pattern. The presence and amount of amino acids and sugars in root exudates (July to October) and root extracts (July to November) have been studied. The amount of cellulose, hemicellulose and lignin components, the pH and moisture content of nonrhizosphere soils from corresponding vertical zones have been determined and the effect of root exudates of different age on 15 rhizosphere fungi has been studied. (See PDF at Slideshare.net)
Cite this as- Kanaujia R.S. (1981): Studies on certain aspects of root surface fungi. I. Fungi on living roots of Pennisetum typhoides (Burm f.) Stapf et Hubb. ACTA MYCOLOGICA. XVII (1-2): 5-25.
Friday, 23 October 2015
Studies on certain aspects of root surface fungi II. Succession of fungi on decomposing Pennisetum typhoides (Burm. f.) Stapf et Hubb.
Sixty seven fungal species from the nonrhizosphere (NR), rhizosphere (RS) and cortical (RPC)and steler (RPS) parts of rhizosphere of crown (RC), middle (RM) and distal (RD) regions of decomposing roots of Pennisetum typhoides (Burm.f.)Stapf. et Hubb. were isolated during December to June, 1970-72. The number of fungal species gradually decrease from NR-RPS in horizontal and RC-RD in vertical regions. The fungal population was always higher in RS of different depths than in corresponding NR region. The amino acids and sugar component of the roots showed a direct correlation with the fungal population. The amount of cellulose, hemicellulose and lignin components of roots gradually decreased from December to June. Root-washing collected from RC, Rm and RD regions exhibited the presence of vanillic acid and 3-4 dihydroxy benzoic acid during March and April. It also exerted an adverse effect on the 10 rhizosphere fungi during this period. pH and moisture contents showed a poor correlation with the fungal population except during summer months. Phycomycetes with species of Deuteromycetes obtained in the first phase was followed by Deuteromycetes along with few Ascomycetes in the second phase.In the last Deuteromycetes with some sterile mycelia were isolated. Aspergilli were the most numerous throughout the investigation. (Full paper at Slideshare.net)
Cited this as: Kanaujia R.S. (1981): Studies on certain aspects of root surface fungi II. Succession of fungi on decomposing Pennisetum typhoides (Burm. f.) Stapf et Hubb. ACTA MYCOLOGICA. 17 (1&2): 27-40.
Studies on certain aspects of root surface fungi. III. Effect of Harvesting
The effect of harvesting of above ground part on the succession of fungi on crown, middle and distal regions of decomposing roots of Pennisetum typhoides (Burm f.) Stapf et Hubb. was investigated for a period of six months (January to June 1971). The number of fungal species was generally lower in harvested plants than in standing plants whereas the fungal population exhibited reverse trend. The amino acids, sugars, cellulose, hemicellulose and lignin components of the root in different vertical regions were assessed and a correlation was established between the above factors and fungal succession in the two sets of plants. It was also noticed that roots in all the depths decomposed earlier than the set where aerial parts left intact and no phytotoxin were detected in the harvested set against standing one where vanilic acid and 3-4 dihydroxybenzoic acids were chromatogrammed during March to April. The pH and moisture content exhibited with the fungal succession. Deuteromycetes along with few Phycomycetes in the beginning, Deuteromycetes with few Ascomycetes in the second phase and Deuteromycetes along with Mycelia sterilia in the third phase were isolated. (Full paper at Slideshare.net)
Cited this as- Kanaujia R.S. (1982): Studies on certain aspects of root surface fungi. III. Effect of Harvesting. ACTA MYCOLOGICA. XVIII (1): 45-60.
Survey of Fungi from Archaeological Digs at Faizabad
A study of the fungi from the soil of 8.5 m deep archaeological digs- differentiated into 18 strata- at Katra in Ayodhya of Faizabad district (U.P.) has been made. A total of 23 different fungal species were isolated from 18 different strata of the digs. The upper stratum (0.0-0.23 m) was found to harbour a greater number of fungi, which decrease in quality and quantity towards the lower profiles up to 4.5-5.35 m and finally to nil. The greater no of fungi in upper strata may actually be attributed to organic matter content governing their distribution, and the decrease in fungi below this layer may account for the decrease in organic matter content. The members of phycomycetes and ascomycetes were confined to the upper few strata which corresponded to the availability of nutrients while deuteromycetes were diversified in their distribution which exhibits their nutritional adaptability, capacity to withstand even nutritionally deficient substrate and tolerance to desiccation.. (Full paper at Slideshare.net)
Cite this as- Kanaujia R.S. and Singh C.S. (1977): Survey of Fungi from Archaeological Digs at Faizabad. FERTILIZER TECHNOLOGY. 14(1&2): 146-148.
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