Analysis of expressed sequence tags from Prunus mume flower and fruit and development of simple sequence repeat markers
© Li et al; licensee BioMed Central Ltd. 2010
Received: 13 May 2010
Accepted: 13 July 2010
Published: 13 July 2010
Expressed Sequence Tag (EST) has been a cost-effective tool in molecular biology and represents an abundant valuable resource for genome annotation, gene expression, and comparative genomics in plants.
In this study, we constructed a cDNA library of Prunus mume flower and fruit, sequenced 10,123 clones of the library, and obtained 8,656 expressed sequence tag (EST) sequences with high quality. The ESTs were assembled into 4,473 unigenes composed of 1,492 contigs and 2,981 singletons and that have been deposited in NCBI (accession IDs: GW868575 - GW873047), among which 1,294 unique ESTs were with known or putative functions. Furthermore, we found 1,233 putative simple sequence repeats (SSRs) in the P. mume unigene dataset. We randomly tested 42 pairs of PCR primers flanking potential SSRs, and 14 pairs were identified as true-to-type SSR loci and could amplify polymorphic bands from 20 individual plants of P. mume. We further used the 14 EST-SSR primer pairs to test the transferability on peach and plum. The result showed that nearly 89% of the primer pairs produced target PCR bands in the two species. A high level of marker polymorphism was observed in the plum species (65%) and low in the peach (46%), and the clustering analysis of the three species indicated that these SSR markers were useful in the evaluation of genetic relationships and diversity between and within the Prunus species.
We have constructed the first cDNA library of P. mume flower and fruit, and our data provide sets of molecular biology resources for P. mume and other Prunus species. These resources will be useful for further study such as genome annotation, new gene discovery, gene functional analysis, molecular breeding, evolution and comparative genomics between Prunus species.
Mei (Prunus mume) originated in China and belongs to the sub-family Prunoideae within the Rosaceae family and is widely cultivated in East Asian countries. Mei trees are classified into two groups, fruiting mei and flowering mei, based on their uses . The fruiting mei has been cultivated in China for more than 7000 years according to the historical records, and now it is also widely cultivated in Japan . The processed products of mei include salted mei, mei wine and juice have high nutritional and medicinal value and are consumed in some countries, including China, Japan, and Korea. Chu  reported that mei flower and young fruit can tolerate relatively low temperatures (-4°C ~ -2°C) in early spring. These attributes make it an economically important and excellent ornamental tree in south China. Mei has long played an important role in human diet and health, but there is dearth of information about its flower and fruit development, physiology and biochemistry. The scarcity of knowledge contributes to difficulties in breeding, production, and storage of fruits. Mei cDNA library construction and EST analysis could be employed for the study of important genes responsible for flower and fruit development and their evolution in the plant kingdom.
Expressed sequence tags (ESTs) are partial sequences of expressed genes prepared by reverse transcribing mRNA and cloning the cDNA fragments into a plasmid and they are also gained by large scale sequencing at one instance . They represent a snapshot of genes expressed in a given tissue and/or at a given developmental stage . In plants, this method was initially applied to the model plant Arabidopsis thaliana. Recently, many EST libraries of a wide range of plant species have been constructed for the genes involved in plant growth and differentiation , secondary metabolism  and biochemical pathways [9, 10] as well as responses to pathogen attack and environmental stresses . ESTs are proven cost-effective tools and represent abundant valuable resources for genome annotation, gene expression, and comparative genomics in non-model plants [12, 13]. EST has also played an important role in functional genomics research on new functional gene discovery other than the whole genome [14–16]. By April 23, 2010, a total of 65,389,085 ESTs had been submitted to the National Center for Biotechnology Information (NCBI) from 1,989 species. The numbers of ESTs submitted are increasing rapidly at an approximate monthly rate of one million.
EST libraries for fruit trees such as grape, citrus, almond, strawberry, apricot, apple, blackberry and peach [12, 13, 17–22] have been constructed, sequenced, analyzed and deposited in databases. However, for P. mume, only 116 hits were found in the dbEST of the GenBank http://www.ncbi.nlm.nih.gov/dbEST/dbEST_summary.html in May 2010, a much lower figure than those of other main Prunus plants. In this study, a suitable high quality cDNA library from flowers and fruits of mei was constructed for the analysis of expressed sequence tags (ESTs), and to generate an EST resource for EST-SSR development of P. mume, the cDNA-based design of microarrays needed for understanding gene expression, and provide a platform for mei functional genomic studies on growth, development, metabolic regulation mechanisms, and so on. In this study, 1,294 unique sequences generated from 4,473 unigenes have homology with other plants, and 1,130 could be annotated with known and putative functions.
EST-SSR has been applied in molecular biology studies of fruiting trees as a new technology, especially on its application in some research fields of pomology, including genetic diversity analysis , genetic linkage map construction [24, 25], comparative mapping [26, 27], molecular phylogeny and cultivar identification . Based on these EST resources, types and frequency of simple sequence repeats (EST-SSRs) with a motif length of 2-6 bp were searched by MISA software. The EST-SSRs generated in this study will be an efficient tool for additional genetic and genomic research in mei and even in Prunus species.
Quality inspection of the cDNA library
Quality inspection and summaries of EST sequence analysis of the cDNA library of P. mume.
1.4 × 106 pfu/mL
Number of raw sequences
Number of high quality sequences
Average EST length
Number of unigenes
Average unigene length
Average number of ESTs per unigene
Average number of ESTs per contig
Maximum number of ESTs per contig
Minimum unigene length
Maximum unigene length
Minimum ORF length
Maximum ORF length
Average ORF length
ESTs obtained and assembled
A total of 10,123 clones were randomly picked and subjected to sequencing for the flower and fruit cDNA library. The leading vector, tailing of the sequence, and poor-quality sequences were excluded first, and 8,656 non-redundant EST sequences were obtained, showing a high success rate of sequencing. The average length of ESTs without vector was 464 bp. 4,473 non-redundant unigenes were assembled and most of them (3,672 unigenes, 82.1%) have sequence lengths between 400 and 800 bp, and only 2.4% (110) were shorter than 200 bp (see Additional file 1). The average length of unigene sequences was 560 bp, which was longer than that in other fruit trees such as persimmon , grapevine [12, 30], apricot  and citrus , but shorter than almond  and peach . The minimum and maximum length of these unigenes were 101 bp and 1,471 bp, and the average number of ESTs per unigene was 1.9. These unigenes were composed of 1,492 (33.36%) contigs and 2,981 (66.64%) singletons, with the number of average and maximum ESTs per contig being 3.8 and 84, respectively (Table 1). Only 11.6% of the contigs were composed of more than 4 ESTs (Additional file 2), suggesting that the redundancy rate is relatively low in this normalized library. In addition, the sequences data were submitted to the EST database of NCBI and publicly available (GW868575-GW873047).
EST annotation and functional classification
Grouping of unigenes from flower and fruit cDNA library of P. mume.
Number of ESTs in Category
General function prediction only
Posttranslational modification, protein turnover, chaperones
Carbohydrate transport and metabolism
Amino acid transport and metabolism
Energy production and conversion
Translation, ribosomal structure and biogenesis
Lipid transport and metabolism
Inorganic ion transport and metabolism
Cell wall/membrane/envelope biogenesis
Coenzyme transport and metabolism
Signal transduction mechanisms
Replication, recombination and repair
Secondary metabolites biosynthesis, transport and matabolism
Intracellular trafficking, secretion, and vesicular transport
Cell cycle control, cell division, chromosome partitioning
Nucleotide transport and metabolism
RNA processing and modification
Chromatin structure and dynamics
Alignment against EST database of Prunus species
Characterization of microsatellite sequences
Distribution to different repeat type classes of EST library in mei.
Number of SSRs
Summaries of EST-SSR primers and repeat motif.
Primer sequence (5'→3')*
Expected product (bp)
Transferability of P. mume EST microsatellite markers
List of the cultivars used in this study.
'Lv' e mei'
P. mume e
Analysis of genetic diversity
Mei is an important fruit crop and famous ornamental tree in China, with processed mei products playing an important role in the economy and in people's daily lives. Expressed sequence tags (ESTs) are sequenced portions of messenger RNA, the projects of EST have been initiated for numerous plant and animal species, and generated large amount of sequence information that can be used for gene discovery, functional genetic studies, and marker development . As we know, much more molecular researches have been carried out on mei, but the studies on flower and fruit development are poor. In this study, a high quality cDNA library of mei containing highly variable EST sequences was constructed, using a mixture of RNAs from plant materials at various stages, so as to understand the molecular mechanisms of growth, development and metabolic regulation at different development stages. The sequencing of mei ESTs can definitely provide an important platform for the studies of functional genomics, and can greatly accelerate the new gene discovery and study on EST-SSR development of P. mume.
In this study, the results of EST annotation and functional classification show that 1,130 unigenes have similarities to Vitis vinifera, Populus trichocarpa and P. persica. In the classification of known or putative functions (Additional file 4), the largest proportion of functionally assigned ESTs fell into three categories: primary transport and metabolism, protein synthesis and energy. Alignment of present ESTs was useful for comparative genomics. In this paper, we first compared the ESTs of P. mume with other Prunus plants, the results showed that these ESTs sequences were conserved also had high homology with other Prunus, which providing an important information for comparative genomics in Prunus species.
The scope of EST-SSR marker development is limited to the species for which sequence databases already exist. The SSR marker development for plant species lacking a sequence database can still be expensive and time consuming. An alternative approach for SSR marker development in those species could be the utilization of SSR markers from related species . As the EST-SSR markers are derived from transcribed regions of DNA, they are expected to be more conserved and have a higher rate of transferability and polymorphism than genomic SSR markers . By virtue of the sequence conservation of transcribed regions of the genome, a significant portion of the primer pairs designed from EST-SSRs is expected to function in distantly related species . Transferability of EST-derived markers over different taxonomic levels has been demonstrated earlier [27, 41]. In our study, the majority of our 14 EST-derived SSR loci from P. mume revealed cross-species amplification with alleles of comparable sizes in peach and plum. As expected, the transferability rate of the markers was high, which suggests that the flanking regions of these SSR loci are sufficiently conserved, and can be used for comparative analyses of genetic diversity, population structures and so on. It also indicated that these SSRs generated from P. mume can be useful for the development of conserved markers for linkage mapping and QTL analyses in different Prunus species.
In addition, the polymorphism rate in peach (46%) was lower than in plum (65%) and mei (70%). This may be due to the fact that most of the peach cultivars were from the same breeding program and thus have similar genetic background. The plum and mei cultivars have wider geographical distribution and bigger genetic differences. A dendrogram was constructed using the polymorphic bands in 30 cultivars of P. mume, P. persica and P. salicina, the relationships and diversity among these three species were analyzed accurately and can be roughly and visually reflected from the dendrogram. These results further suggest the applicability of mei EST-SSR markers in genetic study of Prunus species.
This paper provides the first P. mume flower and fruit cDNA library. In addition, large scale and valuable EST information which can be great help to some further research about gene cloning, gene function and expression analysis of P. mume were generated. Our analysis further highlights the efficient identification of SSR from mei ESTs and the high transferability of mei EST-SSR markers between peach and plum.
Sample collection and DNA isolation
Fruits and flowers of P. mume 'Xiyeqing' at different development stages were collected from the fruiting mei resource nursery of Nanjing Agricultural University, Najing PRC. The materials were collected from February 23, 2009 to May 6, 2009 and the collected tissues were frozen immediately in liquid nitrogen and stored at -40°C awaiting RNA extraction. The flowers were collected at four growing stages including small bud, medium bud, half-unfolding flower and completely unfolding flower, while the fruits were collected for seven weeks until the stone hardening stage, with the average size of 0.3, 0.6, 0.9, 1.2, 1.8, 2.6, 3.6 cm diameter.
All the samples of P. mume consisting of six introduced from Japan and used for EST-SSR analysis were collected on April 4, 2009 in this resource nursery and their names are described in Table 5. Cultivars of P. persica and P. salicina were obtained from National Germplasm Resources Garden of Peach in Jiangsu Academy of Agricultural Sciences, Najing PRC, the name of cultivars are also listed in Table 5. Genomic DNA was isolated from leaves using the DNeasy Plant Mini Kit (Qiagen, City, CA, USA) according to the manufacturer's recommendations.
cDNA library construction
Total RNA from the selected flowers and fruits of each stage was extracted by using Trizol (Takara Biotechnology, Dalian Co. Ltd.) respectively, and then 1 μg from each stage were mixed, while cDNA library construction was carried out according to the Creator SMART cDNA Construction Kit protocol (Clontech, USA, Cat.No.634903). The quantity and integrity of RNA was detected by BioPhotometer (Eppendorf, Gene Company Limited) while electrophoresis was done on agarose with Ethidium Bromide. The first strand and double strand cDNA were synthesized according to the protocol of Creator SMART cDNA Construction Kit (Clontech, USA, Cat.No.634903).
For first strand cDNA synthesis: 3 μl RNA sample, 1 μl SMART IV oligonucleotide (5'-AAGCAGTGGTATCAACGCAGAGTGGCCATTACGGCCGGG-3') and 1 μl CDS-3 M adapter (10 μM, 5'-AAGCAGTGGTATCAACGCAGAGTGGCCGAGGCGGCC (T)20VN-3') were mixed and incubated at 72°C for 2 min and placed in ice for another 2 min. 2.0 μl 5 × First-Strand Buffer, 1.0 μl DDT (20 mM), 1.0 μl dNTP Mix (10 mM), 1.0 μl PowerScript™ Reverse Transcriptase (Invitrogen Biotechnology Co., Ltd) were added to a total volume of 10 μl, mixed well and incubated at 42°C for 1 hour.
Double strand cDNA synthesis: The single strand cDNA was amplified for double strand cDNA synthesis by long-distance polymerase chain reaction (LD-PCR), in the following steps, 2 μl single-strand cDNA were added to 80 μl ddH2O, 10 μl 10 × Advantage 2 PCR Buffer, 2 μl 50 × dNTP Mix, 4 μl M1 PCR Primer (10 μM, 5'-AAGCAGTGGTATCAACGCAGAGT-3'), and 2 μl 50 × Advantage 2 Polymerase Mix then topped with ddH2O to make a total volume of 100 μl. The mixture was centrifuged then amplified as follows: 95°C for 1 min; 20 cycles of 95°C for 15 sec and 68°C for 6 min. Five microliters of the centrifuged PCR product were pipetted onto a 1.2% agarose/EtBr gel to check the double strand (ds)-cDNA quality. The concentration of the ds-cDNA was estimated by comparing with a suitable DNA marker.
The remaining double-strand cDNA was digested by SfiI Enzyme then sized, purified by a QIA quick PCR Purification Kit (Qiagen Cat.No.2810) and packaged in order to filter the fragments shorter than 400 bp. Double strand cDNA with cohesive ends was finally ligated into pDNR-LIB vector by T4 ligase, the recombinant vector was transformed into Escherichia coli DH10B by electroporation at 2.1 KV, cultured overnight in 37°C after directly applying onto a media plate with chloramphenicol.
Sequencing for the clones
After the cDNA library was plated onto LB media plates, the white clones were picked into a 96-well block containing 800 μl LB culture media (supplied with chloramphenicol 50 mg/ml) and incubated at 230 rpm and 37°C overnight. Before large scale sequencing, PCR reaction was initially conducted to check the size of inserted fragments using random selection of 30 clones . Finally, about 10,000 fresh clones were sent to Beijing Huada Gene Company (Beijing, P.R. China) for sequencing.
Among the vector sequences, low quality and redundant sequences were rejected with Chromas, Phred  and phd2fasta. Sequences longer than 100 bp were outputted after converting to FASTA forms. Uniform sequences were assembled using CAP3  software for splicing into contigs with two or more ESTs.
EST annotation and function
For further functional annotation, comparative and classification analysis, the non-redundant sequences (edited ESTs sequences) considered as valid were subjected to BlastX analysis against the non-redundant protein database (nr) of National Center of Biotechnology Institute (NCBI) to search for similarity. Search results were imported into Microsoft Office Excel where sequence matches with E-value scores ≤10-10 were considered significant and used to categorize the ESTs based on their putative or known functions of plant genes.
EST alignment against Prunus EST database
The software package of blast was download from the FTP server ftp://ftp.ncbi.nlm.nih.gov/blast/executables/ of NCBI, then compiled and installed according to the instructions . Alignment of nucleic acids were carried on among the ESTs of P. persica, P. armeniaca submitted in NCBI (by the end of April 1, 2010) and unigenes generated from P.mume cDNA library by using blastn with e-10 as the parameter.
Identification of EST-SSRs
The EST library was searched for sequences containing SSRs using MISA , a Perl script able to detect perfect as well as compound microsatellites in nucleotide sequences. Compound microsatellites were defined as repeats interrupted by a non-repetitive sequence of a maximum 100 nucleotides. MISA was set with the following minimum length criteria for the extraction of repeated units (unit size/minimum number of repeats): at least six dinucleotides (2/6); at least five trinucleotides (3/5); three tetranucleotides (4/3), three pentanucleotides (5/3) and three hexanucleotides (6/3). Sequences contained corresponding repeat units were selected for marker development.
EST-SSR primers designed and PCR amplication
Primer pairs flanking repeats with a minimum length 20 bp were designed using by Primer3.0 program http://frodo.wi.mit.edu/primer3/ and the parameters are as follows: Primer GC%: 40% ~ 60%, and the optimum value of 50%; Primer size: 18 ~ 22 bp; Primer TM: 50 ~ 60°C; Product size ranges: 150-350 bp. The primers designed were also identified by Oligo6 software in order to avoid the primer dimers, hairpin structure and the occurrence of mismatch and so on. Primers were synthesized by Invitrogen, Shanghai PR China.
The PCR amplification reactions were performed using an Eppendorf Authorized Thermal Cycler each and conducted in a total volume of 25 μl containing 50 -100 ng template DNA, 20 pmol each primer, 2 Units Taq DNA polymerase (purchased from Takara Biotechnology, Dalian Co. Ltd.), 2.5 μl 10 × PCR buffer, 2 μl MgCl2 (2.5 mM), 1.5 μl dNTPs (2.5 mM), and added ddH2O to the total volume. The PCR conditions were: 94°C for 5 min, followed by 35 cycles of 94°C for 30 sec, 50 ~ 60°C for 40 sec, 72°C for 1 min, and a final extension step at 72°C for 10 min. To check for PCR product quality, 8 μl of the PCR reaction was visualized on a 1.5% agarose gel and the remaining reaction was then electrophoresis on 5% polyacrylamide gel in 1 × TBE buffer at 80 W for 100 to 120 min. Gels were stained with silver nitrate following the protocol detailed by Bassam  with few modifications and photographed in white light.
To assess the transferability of our EST-SSR markers, we tested their amplification in other Prunus species containing 10 cultivars of P. persica (peach) and 10 of P. salicina (plum). The PCR amplification reactions were performed as the same as above.
According to presence or absence of bands on the polyacrylamide gel, the same electrophoretic bands were recorded as 1, no bands were recorded as 0. The polymorphisms data were inputted into Excel for the cluster analysis using NYSYS-pc software and a dendrogram was generated for the analysis of genetic relationship and diversity among the varieties of peach, plum and mei.
This work was supported by the Fundamental Research Funds for the Central Universities (No. KYJ200909) and the Program of NCET (No. NCET96).
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