What's the highest temperature could actinomycetes isolates tolerate and what's maximum time for these high temperatures
Please anyone help
Dear Sebak,
Please follow the link given below.
http://link.springer.com/article/10.1007/s13213-012-0504-x#page-1
Good Luck
In arid soils of Rajasthan, India, we find some actinomycetes species who can tolerate more than 45 degree centrigrade for at least 7-10 days period. As soil temperature here sometimes reaches more than 52 degree celsus , we find their dominant microorganisms are actinomycetes (actinobacteria).
Bear in mind that Actinomycetes are sporeformer bacteria and may survive high temperatures.
Please find information supporting the ability of some thermophilic actinomycetes to prosper at 42. Many of these will relate to high temperature environments such as deserts and compost piles.
Int J Syst Evol Microbiol. 2015 Sep;65(9):2859-64. doi: 10.1099/ijs.0.000342. Epub 2015 May 19.
Thermoactinomyces guangxiensis sp. nov., a thermophilic actinomycete isolated from mushroom compost.
Wu H1, Liu B2, Pan S1.
Abstract
A novel thermophilic actinomycete, designated strain CD-1(T), was isolated from mushroom compost in Nanning, Guangxi province, China. The strain grew at 37-55 °C (optimum 45-50 °C), pH 6.0-11.0 (optimum pH 7.0-9.0) and with 0-2.0% NaCl (optimum 0-1.0%), formed well-developed white aerial mycelium and pale-yellow vegetative mycelium, and single endospores (0.8-1.0 μm diameter) were borne on long sporophores (2-3 μm length). The endospores were spherical-polyhedron in shape with smooth surface. Based on its phenotypic and phylogenetic characteristics, strain CD-1(T) is affiliated to the genus Thermoactinomyces. It contained meso-diaminopimelic acid as the diagnostic diamino acid; the whole-cell sugars were ribose and glucose. Major fatty acids were iso-C15 : 0, C16 : 0, anteiso-C15 : 0 and iso-C17 : 0. MK-7 was the predominant menaquinone. The polar phospholipids were diphosphatidylglycerol, phosphatidylglycerol, phosphatidylethanolamine, phosphatidylethanolamine containing hydroxylated fatty acids, ninhydrin-positive glycophospholipid, an unknown phospholipid and glycolipids. The G+C content of the genomic DNA was 48.8%. 16S rRNA gene sequence analysis showed that the organism was closely related to Lihuaxuella thermophila YIM 77831(T) (95.69% sequence similarity), Thermoactinomyces daqus H-18(T) (95.49%), Laceyella putida KCTC 3666(T) (95.05%), Thermoactinomyces vulgaris KCTC 9076(T) (95.01%) and Thermoactinomyces intermedius JCM 3312(T) (94.55%). Levels of DNA-DNA relatedness between strain CD-1T and Lihuaxuella thermophila JCM 18059(T), Thermoactinomyces daqus DSM 45914(T), Laceyella putida JCM 8091(T), Thermoactinomyces vulgaris JCM 3162(T) and Thermoactinomyces intermedius JCM 3312(T) were low (22.8, 33.3, 24.7, 29.4 and 30.0%, respectively). A battery of phenotypic, genotypic and DNA-DNA relatedness data indicated that strain CD-1T represented a novel species of the genus Thermoactinomyces, for which the name Thermoactinomyces guangxiensis sp. nov. is proposed. The type strain is CD-1(T) ( = ATCC BAA-2630(T) = CGMCC 4.7156(T)).
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