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| Characteristics of Streptosporangium Mycelia and Their Alkali Extractable Components During Cellulose Decomposition |
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| KeyWord:Streptosporangium sp.; cellulose decomposition; mycelium structure characteristics; alkali-extractable components |
| Author Name | Affiliation | | TIAN Xiang-ling | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China | | DOU Sen | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China | | LI Yan | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China | | CUI Ting-ting | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China | | YU Miao | College of Resources and Environmental Sciences, Jilin Agricultural University, Changchun 130118, China |
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| Abstract: |
| It has been observed that Streptosporangium sp. grow on decomposing cellulous. In this study, using elementary analysis, differential thermal analysis and infrared spectrometry, we examined the chemical structure of the mycelia of Streptosporangium sp. during cellulose decomposition. Carbon-containing components of alkali extraction from the mycelia were analyzed by modified humus composition method. The production rate of mycelia increased significantly with incubation time. The carbon in alkali extracts of the mycelia was mainly in “water-soluble”and “alkali-soluble but acid-insoluble（humic acid）” fractions. However, there was little carbon in “alkali soluble and acid soluble（fulvic acid）” fraction. During the 38th~60th day of incubation, C in “alkali soluble and acid soluble” and “residue（equivalent of humin）” increased, but the proportion of “alkali-soluble but acid-insoluble” to alkali-extractable fraction decreased gradually with incubation time, indicating slowdown in formation of “alkali soluble but acid insoluble components”. At later stage of incubation（38~60 d）, mycelia had reduced oxidation but increased condensation and aromaticity. The C/N, H/C, and O+S/C molar ratios of Streptsporangium sp. mycelia（60 d） were higher, but C content and exothermal high to medium ratios were lower than those of humic acid from black soil. The mycelia had relatively simple molecular structure as compared to humic acid from black soil. A longer incubation time is necessary to determine whether during cellulose decomposition Streptosporangium could produce substances that have similar properties and structures to humic acid from black soil. |
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