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Vu DD, Shah SNM, Pham MP, Bui VT, Nguyen MT, Nguyen TPT. De novo assembly and Transcriptome characterization of an endemic species of Vietnam, Panax vietnamensis Ha et Grushv., including the development of EST-SSR markers for population genetics. BMC PLANT BIOLOGY 2020; 20:358. [PMID: 32727354 PMCID: PMC7391578 DOI: 10.1186/s12870-020-02571-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 07/23/2020] [Indexed: 05/21/2023]
Abstract
BACKGROUND Understanding the genetic diversity in endangered species that occur inforest remnants is necessary to establish efficient strategies for the species conservation, restoration and management. Panax vietnamensis Ha et Grushv. is medicinally important, endemic and endangered species of Vietnam. However, genetic diversity and structure of population are unknown due to lack of efficient molecular markers. RESULTS In this study, we employed Illumina HiSeq™ 4000 sequencing to analyze the transcriptomes of P. vietnamensis (roots, leaves and stems). Raw reads total of 23,741,783 was obtained and then assembled, from which the generated unigenes were 89,271 (average length = 598.3191 nt). The 31,686 unigenes were annotated in different databases i.e. Gene Ontology, Kyoto Encyclopedia of Genes and Genomes, Nucleotide Collection (NR/NT) and Swiss-Prot for functional annotation. Further, 11,343 EST-SSRs were detected. From 7774 primer pairs, 101 were selected for polymorphism validation, in which; 20 primer pairs were successfully amplified to DNA fragments and significant amounts of polymorphism was observed within population. The nine polymorphic microsatellite loci were used for population structure and diversity analyses. The obtained results revealed high levels of genetic diversity in populations, the average observed and expected heterozygosity were HO = 0.422 and HE = 0.479, respectively. During the Bottleneck analysis using TPM and SMM models (p < 0.01) shows that targeted population is significantly heterozygote deficient. This suggests sign of the bottleneck in all populations. Genetic differentiation between populations was moderate (FST = 0.133) and indicating slightly high level of gene flow (Nm = 1.63). Analysis of molecular variance (AMOVA) showed 63.17% of variation within individuals and 12.45% among populations. Our results shows two genetic clusters related to geographical distances. CONCLUSION Our study will assist conservators in future conservation management, breeding, production and habitats restoration of the species.
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Affiliation(s)
- Dinh Duy Vu
- Vietnam - Russia Tropical Centre, 63 Nguyen Van Huyen, Nghia Do, Cau Giay, Hanoi, Vietnam
- Graduate University of Science and Technology (GUST), Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
- Department of Experimental Taxonomy & Genetic Diversity, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Syed Noor Muhammad Shah
- Department of Horticulture, Faculty of Agriculture, Gomal University Dera Ismail Khan, Dera Ismail Khan, Pakistan
| | - Mai Phuong Pham
- Vietnam - Russia Tropical Centre, 63 Nguyen Van Huyen, Nghia Do, Cau Giay, Hanoi, Vietnam
| | - Van Thang Bui
- College of Forestry Biotechnology, Vietnam National University of Forestry, Xuan Mai, Hanoi, Vietnam
| | - Minh Tam Nguyen
- Department of Experimental Taxonomy & Genetic Diversity, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam
| | - Thi Phuong Trang Nguyen
- Institute of Ecology and Biological Resource, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet, , Cau Giay, Hanoi, Vietnam.
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De Novo Transcriptome Assembly and Population Genetic Analyses for an Endangered Chinese Endemic Acer miaotaiense (Aceraceae). Genes (Basel) 2018; 9:genes9080378. [PMID: 30060522 PMCID: PMC6115825 DOI: 10.3390/genes9080378] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2018] [Revised: 07/23/2018] [Accepted: 07/24/2018] [Indexed: 12/17/2022] Open
Abstract
Acer miaotaiense (P. C. Tsoong) is a rare and highly endangered plant in China. Because of the lack of genomic information and the limited number of available molecular markers, there are insufficient tools to determine the genetic diversity of this species. Here, 93,305 unigenes were obtained by multiple assembled contigs with a transcriptome sequencing program. Furthermore, 12,819 expressed sequence tag-derived simple sequence repeat (EST-SSR) markers were generated, 300 were randomly selected and synthesized, 19 primer pairs were identified as highly polymorphic (average number of alleles (Na) = 8, expected heterozygosity (He) = 0.635, polymorphism information content (PIC) = 0.604) and were further used for population genetic analysis. All 261 samples were grouped into two genetic clusters by UPGMA, a principal component analyses and a STRUCTURE analyses. A moderate level of genetic differentiation (genetic differentiation index (Fst) = 0.059–0.116, gene flow = 1.904–3.993) among the populations and the major genetic variance (81.01%) within populations were revealed by the AMOVA. Based on the results, scientific conservation strategies should be established using in situ and ex situ conservation strategies. The study provides useful genetic information for the protection of precious wild resources and for further research on the origin and evolution of this endangered plant and its related species.
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Xue H, Zhang P, Shi T, Yang J, Wang L, Wang S, Su Y, Zhang H, Qiao Y, Li X. Genome-wide characterization of simple sequence repeats in Pyrus bretschneideri and their application in an analysis of genetic diversity in pear. BMC Genomics 2018; 19:473. [PMID: 29914361 PMCID: PMC6006662 DOI: 10.1186/s12864-018-4822-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Accepted: 05/23/2018] [Indexed: 12/19/2022] Open
Abstract
Background Pear (Pyrus spp.) is an economically important temperate fruit tree worldwide. In the past decade, significant progress has been made in pear molecular genetics based on DNA research, but the number of molecular markers is still quite limited, which hardly satisfies the increasing needs of geneticists and breeders. Results In this study, a total of 156,396 simple sequence repeat (SSR) loci were identified from a genome sequence of Pyrus bretschneideri ‘Dangshansuli’. A total of 101,694 pairs of SSR primers were designed from the SSR loci, and 80,415 of the SSR loci were successfully located on 17 linkage groups (LGs). A total of 534 primer pairs were synthesized and preliminarily screened in four pear cultivars, and of these, 332 primer pairs were selected as clear, stable, and polymorphic SSR markers. Eighteen polymorphic SSR markers were randomly selected from the 332 polymorphic SSR markers in order to perform a further analysis of the genetic diversity among 44 pear cultivars. The 14 European pears and their hybrid materials were clustered into one group (European pear group); 29 Asian pear cultivars were clustered into one group (Asian pear group); and the Zangli pear cultivar ‘Deqinli’ from Yunnan Province, China, was grouped in an independent group, which suggested that the cultivar ‘Deqinli’ is a distinct and valuable germplasm resource. The population structure analysis partitioned the 44 cultivars into two populations, Pop 1 and Pop 2. Pop 2 was further divided into two subpopulations. Results from the population structure analysis were generally consistent with the results from the UPGMA cluster analysis. Conclusions The results of the present study showed that the use of next-generating sequencing to develop SSR markers is fast and effective, and the developed SSR markers can be utilized by researchers and breeders for future pear improvement. Electronic supplementary material The online version of this article (10.1186/s12864-018-4822-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Huabai Xue
- College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.,Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Key Laboratory of Fruit Breeding Technology of Ministry of Agriculture, Zhengzhou, 450009, China
| | - Pujuan Zhang
- College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ting Shi
- College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jian Yang
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Key Laboratory of Fruit Breeding Technology of Ministry of Agriculture, Zhengzhou, 450009, China
| | - Long Wang
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Key Laboratory of Fruit Breeding Technology of Ministry of Agriculture, Zhengzhou, 450009, China
| | - Suke Wang
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Key Laboratory of Fruit Breeding Technology of Ministry of Agriculture, Zhengzhou, 450009, China
| | - Yanli Su
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Key Laboratory of Fruit Breeding Technology of Ministry of Agriculture, Zhengzhou, 450009, China
| | - Huirong Zhang
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Key Laboratory of Fruit Breeding Technology of Ministry of Agriculture, Zhengzhou, 450009, China
| | - Yushan Qiao
- College of Horticulture, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Xiugen Li
- Zhengzhou Fruit Research Institute, Chinese Academy of Agricultural Sciences (CAAS), Key Laboratory of Fruit Breeding Technology of Ministry of Agriculture, Zhengzhou, 450009, China.
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Liu Z, Shao W, Shen Y, Ji M, Chen W, Ye Y, Shen Y. Characterization of new microsatellite markers based on the transcriptome sequencing of Clematis finetiana. Hereditas 2018; 155:23. [PMID: 29785177 PMCID: PMC5952850 DOI: 10.1186/s41065-018-0060-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Accepted: 05/02/2018] [Indexed: 11/18/2022] Open
Abstract
Background Clematis is the biggest genus in the family Ranunculaceae with about 300 species. Clematis is also a globally important commercial group of flowers, especially in the United States and European countries. Their petals with different colors and shapes make the genus the “Queen of the Vines”. However, the genomic information and phylogeny of Clematis based on existing molecular studies are limited. In this paper, new microsatellites (SSR) markers were identified from the transcriptome data of C. finetiana obtained using the Illumina paired-end sequencing technology. Results Sequences on a total of 71,900 high-quality unigenes with the mean length of 865 bp were produced in this study. There were 6192unigenes annotated and classified into 49 functional sub-groups in three main ontology categories in GO (Gen Ontology) database,14,022 unigenes mapped to COGs (Clusters of Orthologous Groups) database and classified into 25 functional categories, and 21,494 unigenes obtained and divided into 128 pathways of KEGG (Kyoto Encyclopedia of Genes) Database. A total of 7532 SSRs were discovered from 6337 unigenes. We randomly tested 210 primer pairs, of which 52 primer pairs were able to generate specific products, and 19 possessed polymorphism in the 13 wild populations of six species from Clematis, which were used as a test material. Conclusions The dataset of C. finetiana transcriptome and the identified new SSR markers will promote genetic research and breeding effort in Clematis. Electronic supplementary material The online version of this article (10.1186/s41065-018-0060-x) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Zhigao Liu
- 1College of Landscape Architecture, Nanjing Forestry University, Nanjing, 210037 Jiangsu People's Republic of China.,2College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300 Zhejiang, People's Republic of China
| | - Weili Shao
- 2College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300 Zhejiang, People's Republic of China
| | - Yamei Shen
- 2College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300 Zhejiang, People's Republic of China
| | - Mengcheng Ji
- 2College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300 Zhejiang, People's Republic of China
| | - Wenchao Chen
- 2College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300 Zhejiang, People's Republic of China
| | - Ying Ye
- 2College of Landscape Architecture, Zhejiang A & F University, Hangzhou 311300 Zhejiang, People's Republic of China
| | - Yongbao Shen
- 1College of Landscape Architecture, Nanjing Forestry University, Nanjing, 210037 Jiangsu People's Republic of China
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Yue X, Zheng X, Zong Y, Jiang S, Hu C, Yu P, Liu G, Cao Y, Hu H, Teng Y. Combined Analyses of Chloroplast DNA Haplotypes and Microsatellite Markers Reveal New Insights Into the Origin and Dissemination Route of Cultivated Pears Native to East Asia. FRONTIERS IN PLANT SCIENCE 2018; 9:591. [PMID: 29868056 PMCID: PMC5949605 DOI: 10.3389/fpls.2018.00591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Accepted: 04/16/2018] [Indexed: 05/03/2023]
Abstract
Asian pear plays an important role in the world pear industry, accounting for over 70% of world total production volume. Commercial Asian pear production relies on four major pear cultivar groups, Japanese pear (JP), Chinese white pear (CWP), Chinese sand pear (CSP), and Ussurian pear (UP), but their origins remain controversial. We estimated the genetic diversity levels and structures in a large sample of existing local cultivars to investigate the origins of Asian pears using twenty-five genome-covering nuclear microsatellite (simple sequence repeats, nSSR) markers and two non-coding chloroplast DNA (cpDNA) regions (trnL-trnF and accD-psaI). High levels of genetic diversity were detected for both nSSRs (HE = 0.744) and cpDNAs (Hd = 0.792). The major variation was found within geographic populations of cultivated pear groups, demonstrating a close relationship among cultivar groups. CSPs showed a greater genetic diversity than CWPs and JPs, and lowest levels of genetic differentiation were detected among them. Phylogeographical analyses indicated that the CSP, CWP, and JP were derived from the same progenitor of Pyrus pyrifolia in China. A dissemination route of cultivated P. pyrifolia estimated by approximate Bayesian computation suggested that cultivated P. pyrifolia from the Middle Yangtze River Valley area contributed the major genetic resources to the cultivars, excluding those of southwestern China. Three major genetic groups of cultivated Pyrus pyrifolia were revealed using nSSRs and a Bayesian statistical inference: (a) JPs; (b) cultivars from South-Central China northward to northeastern China, covering the main pear production area in China; (c) cultivars from southwestern China to southeastern China, including Yunnan, Guizhou, Guangdong, Guangxi, and Fujian Provinces. This reflected the synergistic effects of ecogeographical factors and human selection during cultivar spread and improvement. The analyses indicated that UP cultivars might be originated from the interspecific hybridization of wild Pyrus ussuriensis with cultivated Pyrus pyrifolia. The combination of uniparental DNA sequences and nuclear markers give us a better understanding of origins and genetic relationships for Asian pear groups and will be beneficial for the future improvement of Asian pear cultivars.
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Affiliation(s)
- Xiaoyan Yue
- Department of Horticulture, Zhejiang University, Hangzhou, China
- The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture of China, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, China
| | - Xiaoyan Zheng
- College of Ecology, Lishui University, Lishui, China
| | - Yu Zong
- Department of Horticulture, Zhejiang University, Hangzhou, China
- The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture of China, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, China
| | - Shuang Jiang
- Department of Horticulture, Zhejiang University, Hangzhou, China
- The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture of China, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, China
| | - Chunyun Hu
- Department of Horticulture, Zhejiang University, Hangzhou, China
- The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture of China, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, China
| | - Peiyuan Yu
- Department of Horticulture, Zhejiang University, Hangzhou, China
- The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture of China, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, China
| | - Guoqin Liu
- College of Agriculture, Guizhou University, Guiyang, China
| | - Yufen Cao
- Research Institute of Pomology, Chinese Academy of Agricultural Sciences, Xingcheng, China
| | - Hongju Hu
- Institute of Fruit and Tea, Hubei Academy of Agricultural Sciences, Wuhan, China
| | - Yuanwen Teng
- Department of Horticulture, Zhejiang University, Hangzhou, China
- The Key Laboratory of Horticultural Plant Growth, Development and Quality Improvement, Ministry of Agriculture of China, Hangzhou, China
- Zhejiang Provincial Key Laboratory of Integrative Biology of Horticultural Plants, Hangzhou, China
- *Correspondence: Yuanwen Teng,
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Zhou T, Li ZH, Bai GQ, Feng L, Chen C, Wei Y, Chang YX, Zhao GF. Transcriptome Sequencing and Development of Genic SSR Markers of an Endangered Chinese Endemic Genus Dipteronia Oliver (Aceraceae). Molecules 2016; 21:166. [PMID: 26907245 PMCID: PMC6272838 DOI: 10.3390/molecules21030166] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/25/2016] [Accepted: 01/26/2016] [Indexed: 11/16/2022] Open
Abstract
Dipteronia Oliver (Aceraceae) is an endangered Chinese endemic genus consisting of two living species, Dipteronia sinensis and Dipteronia dyeriana. However, studies on the population genetics and evolutionary analyses of Dipteronia have been hindered by limited genomic resources and genetic markers. Here, the generation, de novo assembly and annotation of transcriptome datasets, and a large set of microsatellite or simple sequence repeat (SSR) markers derived from Dipteronia have been described. After Illumina pair-end sequencing, approximately 93.2 million reads were generated and assembled to yield a total of 99,358 unigenes. A majority of these unigenes (53%, 52,789) had at least one blast hit against the public protein databases. Further, 12,377 SSR loci were detected and 4179 primer pairs were designed for experimental validation. Of these 4179 primer pairs, 435 primer pairs were randomly selected to test polymorphism. Our results show that products from 132 primer pairs were polymorphic, in which 97 polymorphic SSR markers were further selected to analyze the genetic diversity of 10 natural populations of Dipteronia. The identification of SSR markers during our research will provide the much valuable data for population genetic analyses and evolutionary studies in Dipteronia.
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Affiliation(s)
- Tao Zhou
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
| | - Zhong-Hu Li
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
| | - Guo-Qing Bai
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
- Xi'an Botanical Garden of Shaanxi Province, Xi'an 710061, China.
| | - Li Feng
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
| | - Chen Chen
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
| | - Yue Wei
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
| | - Yong-Xia Chang
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
| | - Gui-Fang Zhao
- Key Laboratory of Resource Biology and Biotechnology in Western China (Ministry of Education), College of Life Sciences, Northwest University, Xi'an 710069, China.
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Development of Polymorphic Genic SSR Markers by Transcriptome Sequencing in the Welsh Onion (Allium fistulosum L.). APPLIED SCIENCES-BASEL 2015. [DOI: 10.3390/app5041050] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Jia HM, Shen YT, Jiao Y, Wang GY, Dong X, Jia HJ, Du F, Liang SM, Zhou CC, Mao WH, Gao ZS. Development of 107 SSR markers from whole genome shotgun sequences of Chinese bayberry (Myrica rubra) and their application in seedling identification. J Zhejiang Univ Sci B 2015; 15:997-1005. [PMID: 25367792 DOI: 10.1631/jzus.b1400051] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Chinese bayberry (Myrica rubra Sieb. et Zucc.) is one of the important subtropical fruit crops native to the South of China and Asian countries. In this study, 107 novel simple sequence repeat (SSR) molecular markers, a powerful tool for genetic diversity studies, cultivar identification, and linkage map construction, were developed and characterized from whole genome shotgun sequences. M13 tailing for forward primers was applied as a simple method in different situations. In total, 828 alleles across 45 accessions were detected, with an average of 8 alleles per locus. The number of effective alleles ranged from 1.22 to 10.41 with an average of 4.08. The polymorphic information content (PIC) varied from 0.13 to 0.89, with an average of 0.63. Moreover, these markers could also be amplified in their related species Myrica cerifera (syn. Morella cerifera) and Myrica adenophora. Seventy-eight SSR markers can be used to produce a genetic map of a cross between 'Biqi' and 'Dongkui'. A neighbor-joining (NJ) tree was constructed to assess the genetic relationships among accessions, and the elite accessions 'Y2010-70', 'Y2012-140', and 'Y2012-145', were characterized as potential new genotypes for cultivation.
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Affiliation(s)
- Hui-min Jia
- Department of Horticulture, Zhejiang University, Hangzhou 310058, China; Fruit Research Institute, Yuyao 315400, China; Institute of Horticulture, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China; Yuyao Agricultural and Forestry Bureau, Yuyao 315400, China; Bio-Macromolecules Analysis Lab, Analysis Center of Agrobiology and Environmental Sciences, Zhejiang University, Hangzhou 310058, China
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Hu H, Xu Y, Lu HP, Xiao R, Zheng XD, Yu T. Evaluation of yeasts from Tibetan fermented products as agents for biocontrol of blue mold of Nashi pear fruits. J Zhejiang Univ Sci B 2015; 16:275-85. [PMID: 25845361 PMCID: PMC4399428 DOI: 10.1631/jzus.b1400162] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Accepted: 12/10/2014] [Indexed: 11/11/2022]
Abstract
A total of 20 strains of yeast isolated from Tibetan fermented products were screened for antagonism against blue mold of pear caused by Penicillium expansum. Six isolates that inhibited incidence of postharvest decay by 35% or more were selected for further screening. Among them, the most effective was Rhodotorula mucilaginosa. The results showed that washed cell suspensions of R. mucilaginosa yielded better antagonistic efficacy than unwashed cell-culture mixtures, cell-free culture filtrates, and autoclaved cell cultures. Biocontrol activity improved with increasing concentrations of incubated cells. The best concentration was 1×10(8) cells/ml, at which the incidence of decay was only 16.7% after 6 d of incubation. The germination of conidia of P. expansum in vitro was significantly inhibited by both washed cell-suspensions and unwashed cell-culture mixtures. Rapid colonization by yeast at different concentrations showed a relationship between yeast-cell concentration and biocontrol activity. Although the titratable acidity of pear fruits increased after treatment, R. mucilaginosa did not affect the total soluble solids or ascorbic acid content. This is the first study to report that the yeast R. mucilaginosa from Tibet Autonomous Region of China may have potential as an antagonist to control the postharvest decay of pear fruits.
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