American Journal of BioScience
Volume 3, Issue 5, September 2015, Pages: 171-177

Diversity and Anti-microbial Activities of Actinomycetes Associated with Three Species of Lichens

Yi Jiang1, *, Xinyu Wang2, Guiding Li1, Qinyuan Li1, 3, Chengbin Liu1, 4,Xiu Chen1, 4, Lisong Wang2, Yong Li1, Chenglin Jiang1

1Yunnan Institute of Microbiology, Yunnan University, Kunming, Yunnan, P. R. China

2Key Lab for Plant Diversity & Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming, China

3Life Sciences Lab Center, School of Life Sciences, Yunnan University, Kunming, P. R. China

4Institute of Microbial pharmaceuticals, College of Life and Health Science, Northeastern University, Shenyang, P. R. China

Email address:

(Yi Jiang)

To cite this article:

Yi Jiang, Xinyu Wang, Guiding Li, Qinyuan Li, Chengbin Liu,Xiu Chen,Lisong Wang, Yong Li, Chenglin Jiang. Influence of Titanium Carbide on the Three- Body Abrasive Wear Behaviour of Glass-Fabric Reinforced Epoxy Composites. American Journal of BioScience. Vol. 3, No. 5, 2015, pp. 171-177. doi: 10.11648/j.ajbio.20150305.12

Abstract: In order to find new actinomycete resources for discovering new drug leads, the actinomycete associated with lichens was studied. Three species of lichen samples were collected from 3 locations of Yunnan. Actinomycetes in the samples were isolated with 11 media, and identified with 16S rRNA gene sequence procedures. Bacteria of two of the three species were sequenced by using 454 pyrosequencing. The results of both pure culture and 454 pyrosequencing were analyzed and compared. Anti-microbial activities of pure cultural strains were determined with agar diffusion methods. 17 genera of actinobacteria were isolated and identified from Lepraria yunnaniana, and 10 genera of them were exclusive. 12 genera were isolated and identified from Punctelia borreria, and 4 genera of them were exclusive. 11 genera were isolated and identified from Parmotrema austrosinense, and 5 genera were exclusive. Total 28 genera were isolated and identified from the three lichens. Streptomyces, Rhodococcus and Nocardia were distributed widely in the three species of lichens. The results from 454 pyrosequencing revealed total 567 taxa of bacteria were detected; the phylum actinobacteria of them had 107, and was 19%. The phylum Actinobacteria from Lepraria yunnaniana had 99, and from Punctelia borreri had 92. Taxonomic positions of 33 taxa belonging to the phylum Actinobacteria were not identified by using the method. These results showed that the diversity of actinomycetes associated with the three lichens was complex and different from each other. 20%, 19%, 12%, 17%, 9%, and 11 % actinomycete strains had anti-microbial activities against Bacillus subtilis subsp. Subtilis, Staphylococcus aureus subsp. Aureus, Escherichia coli, Pseudomonas aeruginosa, Mycobacterium tuberculosis and Candida albicans respectively. There are 30,000 species of lichens on the earth. Diversity of lichen-associated actinomycetes was very rich, and the anti-microbial activities were higher. Therefore lichen-associated actinomycetes are an important source for discovering new drug leads.

Keywords: Actinomycetes, Diversity, Antimicrobial Activity, Pyrosequencing, 16S rRNA, Lichen

1. Introduction

3/4 applying antibiotics in clinic and agriculture were produced by actinomycetes. Actinomycetes are still one of main sources of new pharmaceutical development (Bérdy 2005; 2012). But the pharmaceutical development is more and more difficult in the world. In order to improve the beneficial result of the development, opening up a new source of actinomycetes is one of possible way (Xu et al. 2010; Jiang et al. 2011).

Lichen is one part of biosphere, and belongs to a symbiont of lichenized fungi and alga or cyanobacteria. Most of lichenized fungi belong to Ascomycota, and small number is Basidiomycota (Wei 1991). Up to now, known kind of lichens is about thirty thousand species in the whole world (Feuerer and Hawksworth 2007; Wang 2012). More thousands of bioactive compounds were discovered from lichen, mainly usnic, gyrophoric and diffractaic acid, polysaccharides, anthraquinones and terpene, and a part of them were used in clinic (Kupchan and Kopperman 1975; Sunil and Klaus 1999; Vertika et al. 2010; Santiago et al. 2013; Sinem and Kadir 2013).

Recent years, some actinomycetes were isolated and identified from lichens (González et al. 2005; Li et al. 2007; An et al. 2009; Hideki et al. 2011; Olga et al. 2011; Pankratov 2012). Lichen is named "pioneers" and "long life organisms". Topography, geology and climate of Yunnan are extremely kaleidoscopic change. It is one area of the richest biodiversity in the world. There is large number of lichens in Yunnan (Wang and Qian 2013). Three species of lichens were selected. Cultivable and uncultivable actinomycetes and anti-microbial activities were studied. Some results are reported here.

2. Materials and Methods

2.1. Sampling and Pretreatment

The test samples of lichens were collected from the surface of the trees or stones (Fig. 1 and Table 1). Each sample was immediately transferred to sterile paper bag. The sample was put in dish and dried for 7 days at 28 ºC.

1                                        2                                       3

1=Lepraria yunnaniana; 2=Punctelia borreria; 3=Parmotrema austrosinense

Fig. 1. Photographs of three lichens.

Table 1. Sample information.

No. Name Sampling Position Growth on Altitude GPS
1 Lepraria yunnaniana Mingfeng Mountain, Kunming Rock 1998m 25°02'11"N
2 Punctelia borreria Mingfeng Mountain,Kunming Pinus koraiensis 1982m 25°02'11"N
3 Parmotrema austrosinense Nanjian, Yunnan Camelia sinensis var. assamica 2341m 24˚50'41"N

2.2. Isolation of Actinomycetes

2.2.1. Isolation Medium for Actinobacteria (Per Liter)

Total eleven media were used. Four of them were better for isolating the actinobacteria. They are:

YIM 6:soluble starch 10g, casein 0.3g, KNO3 2g, MgSO4•7H2O 0.05g, NaCl 2g, K2HPO4 2g, CaCO3 0.02g, FeSO4 10mg, Vit mixture of HV medium 3.7mg, agar 15g. pH 7.2.

YIM 171: Glycerol 10 g, asparagine 1 g, K2HPO4H2O 1 g, MgSO4•7H2O 0.5 g, CaCO3 0.3 g, Vit mixture of HV medium (Hayakawa and Nonomura 1987) 3.7 mg, and agar 15 g, pH 7.2.

YIM 709:Chinese caterpillar fungus polysaccharides (made by our own) 1g, (NH4)2SO4 2.64g, NaCl 2g, KCl 2g, MgCl2•6H2O 2g, K2HPO4 1g, KNO3 0.2g, CaCO3 0.2g, FeSO4 10mg, Vit mixture of HV medium 3.7mg, trace salts 1ml, agar15g. pH 7.5.

YIM 711: Casein 1.5g, soybean peptone 0.5g, K2HPO4•H2O 1g, MgSO4 •7H2O 0.5g, CaCO3 0.3g, NaCl 5g, Vit mixture of HV medium 3.7mg, agar 15g. pH 7.5.

Inhibitors. All media were supplemented with 3 groups of filter-sterilized mixtures or single solutions containing inhibitors against fungi and Gram-negative bacteria (per liter): 1. 50 mg cycloheximide, 50 mg nystatin and 25 mg nalidixic acid; 2. 100 mg cycloheximide, 100 mg nystatin, and 40 mg nalidixic acid; 3. 50 mg K2Cr2O7.

The plate dilution method was used to isolate the actinobacteria. 2 g of each dried sample was grinded with a sterile glass homogenizer, and dissolved in 18 ml of sterile water containing 0.1 % Na4P2O5, followed by shaking at 220 rpm/min for 60 min. The suspension was treated with ultrasound waves for 40s at 150W before coating (Jiang et al. 2010). The suspension was diluted from 10-1 to 10-5, and 0.1 ml of three dilutions, 10-3, 10-4 and 10-5 was used to coat the plates and cultivated for 10 to 25 days at 28 ºC. Subsequently, the colonies were counted, and a single actinomycete colony was picked and inoculated to a slant with the same isolation medium. Samples of three lichens were isolated for three times using different media. The pure strains were conserved at 4 and in 20% of glycerol at -20.

2.2.2. Identification of Pure Cultivated Actinobacteria

A total 480 pure strains were isolated from the three lichens samples. 221 strains were identified after eliminating duplicate strains based on morphological and cultural characteristics. DNA of the pure strains was extracted for 16S rDNA analysis (Orsini and V. Romano-Spica, 2001). PCR amplification of the 16S rDNA, followed by purification and sequencing of the PCR products were performed as previously described (Cui et al., 2001). The forward primer F8 (8±27; 5’-GAG AGT TTG ATC CTG GCT CAG-3’) and the reverse primer (1510±1492; 5’-GGT TAC CTT GTT ACG ACT T-3’) were used. The resulting sequences were manually aligned using the sequences from available, public databases. All pure cultivated strains were identified at a genus and species level.

2.3. 454 Pyrosequencing

Genomic DNA of lichen samples was extracted with InviMag® Stool DNA kit (Invitek, Germany) (Li 2009). Amplification of the 16S rDNA V3 tags was carried out by using the primers: P1 (V3F): "5-NNNNNNNNCCTACGGGAGGCAGCAG-3"; P2 (V3R): "5-NNNNNNNNATTACCGCGGCTGCT-3" and the methods described by Zhang and Chen (2010) and Wang et al. (2012). The tags were sequenced by 454 pyrosequencing method (GS FLX Titanium [Roche]) (Margulies 2005). The QIIME were employed to analyze the bacterial diversities and OTU.

2.4. Determination of Anti-microbial Activities

The pure 221 strains of actinobacteria were fermented using YIM 61 broth (soybean powder 20 g, glucose 10 g, peptone 4 g, K2HPO4 1 g, MgSO4•7H2O 0.5 g, NaCl 1 g, CaCO3 2 g, water 1000 ml, pH 7.8) on shaker 220 rpm at 28 ºC for 7 days. Anti-microbial activities were determined with agar diffusion method. The test organism: Bacillus subtilis subsp. Subtilis CGMCC1.1849, Staphylococcus aureus subsp. Aureus CGMCC1.2386, Escherichia coli CGMCC1.2385,  Pseudomonas aeruginosa CGMCC1.2387, Non-pathogenicity Mycobacterium tuberculosis and Candida albicans CGMCC2.2086.

3. Results and Discussion

3.1. Diversity of Cultivable Actinomycetes

Composition of actinobacteria associated with three species of lichens is showed in Table 1.

3.1.1. Lepraria Yunnaniana

Lepraria yunnaniana belongs to lichenized imperfect fungi.

It distributes in temperate zone, Yangtze basin in China, and always grows on stones and trees. The sample was collected from Mingfeng Mountain, Kunming. 202 pure actinomycetes strains were isolated from the lichen. 72 strains of them selected after eliminating duplicate strains based on morphological and cultural characteristics, and the 16S rDNA sequences were analyzed. A phylogenetic analysis was performed. The strains were identified at the genus and species levels. The 72 strains comprised 17 genera of actinobacteria: Actinomadura, Amnibacterium, Cellulomonas, Candidatus, Kocuria, Kribbella, Microbacterium, Micrococcus, Microlunatus, Micromonospora, Mycobacterium, Nocardia, Pseudonocardia, Rhodococcus, Streptomyces, Streptosporangium and Williamsia. Candidatus is an Incertae sedis which is consist of many "species" (Murray and Schleifer 1994). Williamsia deligens identified in this study was found in human blood (Yassin and Hupfer 2006). The genus Amnibacterium has only two species up to now (Kim et al. 2011). Strain YIM 130106 belonged to this genus, its 16S rDNA sequence similarity with the two known species was below 98.07%, and was possible new species (Xu et al. 2007; Alexander et al. 2010). Members of streptomycetes were predominant. Number of Streptomyces cyaneofuscatus and S. niveus was most, and next was S. sindenensis, S. spiroverticillatus, S. candidus, S. xanthochromogenes, S. globisporus, S. lincolnensis and S. albovinaceus; Rhodococcus fascian had 282×103/g.

3.1.2. Punctelia Borreri

Punctelia borreri belongs to Parmeliaceae, and lichenized Ascomycotina fungi, and distributes widely in temperate zone. Some species of the genus are used as Chinese medicine. 166 pure strains of actinomycetes were isolated form the lichen samples. 83 strains of them were identified by 16S rDNA sequencing. 12 genera of actinobacteria were identified. They were members of Amnibacterium, Arthrobacter, Cellulosimicrobium, Corynebacterium, Kineococcus, Mycobacterium, Nocardia, Oerskovia, Rhodococcus, Saccaropolyspora, Streptomyces and Williamsia. Numbers of Streptomyces cyaneofuscatus, S. niveus and S. globisporus was more than the others on the isolation plates.

3.1.3. Parmotrema Austrosinense

Parmotrema austrosinense belongs to Parmeliaceae. The samples were collected from old Puer Tea tree in Wuliang Mountain, Yunnan. The sample was isolated for three times, and 112 pure strains were obtained. 66 strains of them were identified by 16S rDNA sequencing. The 66 strains were consisted of 11 genera of actinobacteria, Actinoplanes, Arthrobacter, Curtobacterium, Friedmanniella, Kineococcus, Microbacterium, Nocardia, Pseudosporangium, Rhodococcus, Saccharothrix and Streptomyces. Streptomyces niveus was the most. Rhodococcus yunnanensis was also common. The genus Pseudosporangium was published in 2008, and only one species, Pseudosporangium ferrugineum (Matsumoyo et al. 2008). 16S rDNA sequence similarity of Strain YIM 130206 with P. ferrugineum was 97.98%, and was possible new species.

Table 2. Composition of actinobacteria associated with three species of lichens.

Genus 1* 2 3 Genus 1 2 3
Actinomadura 1**     Microlunatus 1    
Actinoplanes     2 Micromonospora 1    
Amnibacterium 1 1   Mycobacterium 2 4  
Arthrobacter   6 2 Nocardia 11 16 8
Candidatus 1     Oerskovia   1  
Cellulomonas 3     Pseudonocardia 1    
Cellulosimicrobium   2   Pseudosporangium     1
Curtobacterium     1 Rhodococcus 13 9 15
Corynebacterium   6   Saccharopolyspora   4  
Friedmanniella     1 Saccharothrix     1
Kineococcus   1 1 Streptomyces 23 32 28
Kocuria 4     Streptosporangium 1    
Kribbella 1     Williamsia 1 1  
Microbacterium 3   6 Total strains 72 83 66
Micrococcus 4     Total genera 17 12 11

1*= Lepraria yunnaniana;2= Punctelia borreri; 3= Parmotrema austrosinense

**=Amount of identified strains

Seventeen genera of actinobacteria were identified from Lepraria yunnaniana. But Actinomadura, Candidatus, Cellulomonas, Kocuria, Kribbella, Micrococcus, Microlunatus, Micromonospora, Pseudonocardia and Streptosporangium were not isolated from other two species of lichens. Cellulosimicrobiu, Corynebacterium, Oerskovia and Saccharopolyspora of twelve genera from Punctelia borreri were not isolated from other two species of lichens. Actinoplanes, Curtobacterium, Friedmanniella, Pseudosporangium and Saccharothrix of eleven genera from Parmotrema austrosinense were not isolated from other two species of lichens. Lepraria yunnaniana owned three genera (Amnibacterium, Mycobacterium, and Williamsia) jointly with Punctelia borreri; only one (Microbacterium) with Parmotrema austrosinense. Punctelia borreri owned Arthrobacter and Kineococcus jointly with Parmotrema austrosinense. Streptomyces, Rhodococcus and Nocardia were isolated from the three lichens, and 37.5%, 16.8% and 15.4% of total respectively (Fig. 2).

Fig. 2. A comparison of actinomycete composition associated with three species of lichens.

3.2. Diversity of Actinobacteria Using 454 Pyrosequencing

High-throughput sequencing procedure (HTS) was used always for estimating the diversity and resource potential of bacteria in special environment. Because Punctelia borreri and Parmotrema austrosinense belongs jointly to Parmeliaceae. So the bacterial compositions of two lichens, Lepraria yunnaniana and Punctelia borreri were determined by using 454 pyrosequencing. The results revealed that total 567 taxa of bacteria were detected; The Phylum Actinobacteria of them had 107, and was 19%. The Phylum Actinobacteria from Lepraria yunnaniana had 99, and from Punctelia borreri had 92. Taxonomic positions of 33 taxa belonging to the Phylum Actinobacteria were not identified by using 454 pyrosequencing.

3.3. Comparison of Actinomycete Diversity at Genus Level Using 454 Pyrosequencing and Pure Cultures

Three genera of actinobacteria, Mycobacterium, Rhodococcus and Streptomyces were detected using 454 pyrosequencing and pure cultivation from the two lichens at the same time. Twelve genera detected from Lepraria yunnaniana with 454 pyrosequencing did not isolated. Sixteen genera detected from Punctelia borreri with 454 pyrosequencing did not isolated. The Sequence based on OUT (operational taxonomic unit) from the two lichens by 454 pyrosequencing was Pseudonocardia 368, Nocardioides 236, Streptomyces 214, Actinomycetospora 212, Promicromonospora 170, Rhodococcus 152, Kribbella 134; sequences by pure culture strain was Streptomyces 55, Nocardia 27, Rhodococcus 21. Eleven genera of pure cultures identified in the two lichens were not detected by 454 pyrosequencing. It shown that resolving power of 454 pyrosequencing was not enough at the genus level (Table 3).

Table 3. A comparison of actinomycetes composition at genus level using 454 pyrosequencing and purified cultures.

Genus 1* 2 Genus 1 2
OTU Strains OTU Strains OTU Strains OTU Strains
Actinomadura   1     Mycobacterium 48 2 48 4
Actinomycetospora 106   106   Nocardia   1   16
Agromyces 10   10   Nocardioides 118   118  
Amnibacterium   1   1 Nonomuraea     12  
Amycolatopsis 1   1   Oerskovia       1
Arthrobacter       6 Patulibacter 7   7  
Candidatus   1     Phycicoccus 43   43  
Cellulomonas   3     Promicromonospora 85   85  
Cellulosimicrobium       2 Pseudonocardia 184 1 184  
Corynebacterium       6 Rhodococcus 76 13 76 9
Cryptosporangium 5   5   Saccharopolyspora 22   22 4
Iamia 7   7   Sanguibacter 8   8  
Kineococcus       1 Sporichthya 11   11  
Kocuria   4     Streptomyces 107 23 107 32
Kribbella 67 1 67   Streptosporangium   1    
Microbacterium   3     Virgisporangium 10   10  
Micrococcus   4     Williamsia   1   1
Microlunatus   1     Yaniella 8   2  
Micromonospora   1     Total 37genera 19 17 20 12

1*= Lepraria yunnaniana;2= Punctelia borreri

3.4. A Comparison of Actinomycete Diversity at Family Level Using 454 Pyrosequencing and Pure Cultures

Total thirty families were detected from the two lichens using 454 pyrosequencing, and 23 from Lepraria yunnaniana, 22 Punctelia borreri. Pure cultures of 12 and 10 families were isolated from the two lichens respectively. Five families, Microbacteriaceae, Micrococcaceae, Mycobacteriaceae, Nocardiaceae and Streptomycetaceae were detected using HTS and pure cultivation from the two lichens at the same time. Kineosporiaceae, Micromonosporaceae, Nocardioidaceae and Streptosporangiaceae detected using 454 pyrosequencing and pure cultivation from one or two of the lichens. Fourteen families were detected from the two lichens with 454 pyrosequencing, but not isolated. Five families, Cellulomonadaceae, Corynebacteriaceae, Propionibacteriaceae, Pseudonicardiaceae and Thermomonosporaceae were isolated, but not by 454 pyrosequencing. The sequence based on OUT from the two lichens by 454 pyrosequencing was Micromonosporaceae 555, Streptomycetaceae 505, Nocardioidaceae 464, Frankiaceae 272, Micrococcaceae 171, Actinosynnemataceae 136; the sequences by pure culture strain was Streptomycetaceae 55, Nocardiaceae 51, Micrococcaceae 14. It is worth to show that number of Frankiaceae was up to 272 OUT, but not isolated. The most of Frankiaceae have nitrogen fixation. Maybe they can play an important role in fixing air nitrogen of the lichens.

Table 4. A comparison of actinomycte composition at Family level using 454 pyrosequencing and pure cultures.

Family 1* 2 Family 1* 2
OTU Strains OTU Strains OTU Strains OTU Strains
Actinopolysporaceae 3   21   Nocardiaceae 9 25 5 26
Cellulomonadaceae   3   1 Nocardioidaceae 303 1 161  
Conexibacteraceae 13   46   Patulibacteraceae 8   17  
Cryptosporangiaceae 16   31   Promicromonosporaceae 85   3 2
Corynebacteriaceae       6 Propionibacteriaceae   1    
Frankiaceae 58   214   Pseudonocardiaceae   1   4
Gaiellaceae 15   11   Rubrobacteraceae 57      
Geodermatophilaceae 8   28   Sanguibacteraceae 8   3  
Iamiaceae 7       Solirubrobacteraceae 12   4  
Intrasporangiaceae 59   11   Sporichthyaceae 11   3  
Kineosporiaceae 9   22 1 Streptomycetaceae 226 23 279 32
Microbacteriaceae 28 4 32 1 Streptosporangiaceae   1 12  
Micrococcaceae 174 8 7 6 Thermomonosporaceae   1    
Micromonosporaceae 123 1 432   Incertae sedis: Candidatus   1    
Mycobacteriaceae 53 2 85 4 Purified cultural strains   72   83
Nakamurellaceae 1   35   Total 30 Families 23 12 22 10

1*= Lepraria yunnaniana;2= Punctelia borreri

3.5. Anti-microbial Activities of Actinomycetes

Anti-microbial activities of 221 pure actinomycete strains were determined by using 6 test microorganisms. The results were showed in Table 5. The results revealed that 20%, 19%, 12%, 17%, 9% and 11% of strains respectively had anti-microbial activities against one to six of Bacillus subtilis subsp. subtilis (CGMCC1.1849); Staphylococcus aureus subsp. aureus (GMCC1.2386), Escherichia coli (CGMCC1.2385), Pseudomonas aeruginosa (CGMCC1.2387), Mycobacterium tuberculosis and Candida albicans. Inhibition of a part of strains was stronger, and inhibition zone were 40mm in diameter. 80.4 % of strains with antimicrobial activities were streptomycetes. These strains with stronger inhibiting microbes and possible novel species will be fermented, and the active substances are isolated.

Table 5. Anti-microbial activities of pure cultivated actinomycetes associated three species of lichens.

Source Test strain Strains with anti-microbial activity
1* 2 3 4 5 6
Lepraria yunnaniana 72 17 17 8 14 6 8
Punctelia borreria 83 16 14 13 16 9 9
Parmotrema austrosinense 66 11 12 6 8 4 8
Total 221 44 43 27 38 19 25
% 100 20 19 12 17 9 11

*Test microbes: 1=Bacillus subtilis subsp. Subtilis, CGMCC1.1849; 2=Staphylococcus aureus subsp. Aureus, CGMCC1.2386, 3=Escherichia coli, CGMCC1.2385; 4=Pseudomonas aeruginosa,  CGMCC1.2387; 5=Mycobacterium tuberculosis; 6=Candida albicans, CGMCC2.2086

4. Discussion

Up to now, twelve genera of actinomycetes, Actinomadura, Actinomycetospora, Actinoplanes, Amycolatopsis, Micromonospora, Planobispora, Pseudonocardia, Rhodococcus, Saccharapolyspora, Streptomyces, Streptosporangium and Geodermatophilus were isolated and identified from lichens (González et al. 2005; Li et al. 2007; An et al. 2009; Hideki et al. 2011; Olga et al. 2011; Pankratov 2012 ), and revealed that actinomycetes from lichens were one of potential source for developing novel drug. In this study, 17, 12 and 11 genera of actinobacteria were isolated and identified from the samples of Lepraria yunnaniana, Punctelia borreri and Parmotrema austrosinense respectively. It is worth to show that 16S rDNA similarity of 33 (15 %) of 221 strains with known species were below 98.5%, they should be considered as new species (Xu et al. 2007; Alexander et al. 2010). Up to now, valid published of actinobacteria are 222 genera (Goodfellow et al. 2012). 28 genera were isolated and identified from only three lichens in this study. There are 30 thousand species of lichens at least in the world. Yunnan is an area having rich biodiversity, and a large numbers of lichens existed there. So the standing stock of actinomycete resources associated lichens should be tremendous, and should become one of important sources for development of new drugs.

Based on this study, the most of actinomycetes associated lichens are still uncultivable. How to become the uncultivable to cultivable actinomycetes is one of important prerequisites for discovering of novel drug leads. In order to obtain more unknown (or new) actinomycetes, selective isolation methods themselves should be studied, renovated and improved ceaselessly.


This research are supported by the National Natural Science Foundation of China (31270001, 31460005), National Institutes of Health USA (1P41GM086184-01A1) and Yunnan Provincial Society Development Project (2014BC006)


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