Literature DB >> 31890354

Microsatellite markers for the endangered Puya raimondii in Peru.

Liscely Tumi1, Yu-Qu Zhang2, Zheng-Feng Wang2, Mery L Suni1, Kevin S Burgess3, Xue-Jun Ge2.   

Abstract

PREMISE: Microsatellite primers were developed for Puya raimondii (Bromeliaceae), an endangered species distributed in the Andean Mountains of Bolivia and Peru. METHODS AND
RESULTS: Genome skimming of P. raimondii, P. macrura, and P. hutchisonii resulted in the selection of 46 pairs of cross-species microsatellite markers. Of these, 12 microsatellite primer pairs produced clear and polymorphic bands in P. raimondii. These primer sets were then used for the detection of potential polymorphisms in 84 P. raimondii individuals collected from four populations in Peru. The number of alleles per locus ranged from one to six, and the observed and expected levels of heterozygosity ranged from 0.000 to 0.8929 and from 0.000 to 0.7662, respectively.
CONCLUSIONS: The microsatellite markers developed in this study will be useful for future population genetic analyses and breeding system studies in P. raimondii.
© 2019 Tumi et al. Applications in Plant Sciences is published by Wiley Periodicals, Inc. on behalf of the Botanical Society of America.

Entities:  

Keywords:  Bromeliaceae; Puya raimondii; codominant markers; genetic variability; genome skimming; next‐generation sequencing

Year:  2019        PMID: 31890354      PMCID: PMC6923705          DOI: 10.1002/aps3.11308

Source DB:  PubMed          Journal:  Appl Plant Sci        ISSN: 2168-0450            Impact factor:   1.936


Puya raimondii Harms (Bromeliaceae), also known as queen of the Andes or, locally, as titanka, grows between 3600 and 4400 m in high‐elevation grasslands and along rocky slopes. It is mostly found in scattered populations along the Andes of Peru and Bolivia, where it plays an important role, serving as a critical refuge, food source, and nesting place for a number of bird species (Salinas et al., 2007). Puya raimondii is the largest species in the Bromeliaceae, producing tens of thousands of flowers per inflorescence. Its stem can reach 5 m tall, on top of a rosette of hundreds of thorny leaves. Being monocarpic, the inflorescence is produced at the end of its life cycle (~100 years), reaching up to 8 m tall. With an estimated 800,000 individuals in Peru, and 30,000–35,000 individuals in Bolivia, the species is considered endangered (Lambe, 2009). The main threats to its survival are anthropogenic fire disturbance, climate change, and declining genetic diversity. To date, accurate and comprehensive studies on the genetic structure of remaining P. raimondii populations are lacking. Although Sgorbati et al. (2004) found high levels of genetic similarity among eight populations of P. raimondii in Peru based on a combination of amplified fragment length polymorphism (AFLP), cpSSR, and random‐amplified polymorphic DNA (RAPD) analyses, a high ratio of polymorphic AFLP markers has also been reported for populations from the Huascarán National Park and neighboring areas (Hornung‐Leoni et al., 2013). In addition, Vadillo (2011) found significant morphological variation for the number of spines on the leaf apices of plants sampled from 15 populations located in the central and southern part of Peru. Collectively, these studies can provide some insight into the genetic structure of P. raimondii populations. However, some of the methods used (i.e., analyses based on morphological traits and dominant genetic markers) are not useful for assessing ecological or evolutionary processes that are critical to development of conservation strategies for the species, such as mating system investigations or parentage analysis. Thus, there is an urgent need to develop codominant genetic markers that can be used to better assess the genetic and ecological impacts of small population size associated with the potential endangerment of P. raimondii. Next‐generation sequencing technology is now widely used in many areas of conservation biology, including for the development of microsatellite markers to assess the genetic structure of populations. In this study, we used next‐generation sequencing (i.e., genome skimming techniques) to develop a set of microsatellite markers for P. raimondii.

Methods and Results

To design primers for microsatellite markers in P. raimondii, one individual each of P. raimondii, P. macrura Mez, and P. hutchisonii L. B. Sm. was sampled for genome skimming. The latter two species and P. macropoda L. B. Sm. were used to conduct cross‐species screening of microsatellite markers in P. raimondii. Puya raimondii is closely related to P. macrura (Jabaily and Sytsma, 2010), whereas the phylogenetic relationship to P. hutchisonii and P. macropoda remains unknown. All four species are distributed in arid regions of the high Andes and are morphologically similar at the juvenile stage. For this study, plant material was collected from Peru: P. raimondii was collected from Chupaca, Lampa, and Bolognesi provinces; P. hutchisonii was collected from Huaylas Province; P. macrura was collected from Huari Province; and P. macropoda was collected from Yungay Province. Voucher specimens for each species were deposited in the Herbarium of the Museo de Historia Natural of Universidad Nacional Mayor de San Marcos (USM), Lima, Peru (Appendix 1). Total genomic DNA was extracted from silica‐dried leaves using a modified cetyltrimethylammonium bromide (CTAB) procedure (Doyle and Doyle, 1987; a higher concentration [3%] of beta‐mercaptoethanol was used in the extraction buffer) and sent to the Beijing Genomics Institute (BGI; Shenzhen, China) for library construction and sequencing. The genomic libraries were sequenced on an Illumina X Ten platform (Illumina, San Diego, California, USA) with a 150‐bp paired‐end strategy; approximately 10 million raw reads and 95,000 assembled contigs (longer than 590 bp) were generated for each species. The raw reads were deposited in the National Center for Biotechnology Information (NCBI) Sequence Read Archive (BioProject number: PRJNA562459, PRJNA562611); SRA number: SRR10023784, SRR10023783, SRR10028124; Appendix 1). The library reads of each of the three species were assembled using SPAdes 3.13.0 (Bankevich et al., 2012). Plastome contigs were identified by queries to GenBank based on BLASTX analysis and subsequently excluded in the assembled genomes. Microsatellite regions were screened in the assembled genome of P. raimondii by using the microsatellite search tool SciRoKo 3.4 (Kofler et al., 2007). PCR primer pairs for microsatellites were designed using Primer3web version 4.1.0 (Untergasser et al., 2012) with the default parameter settings. In total, 220 microsatellite loci from P. raimondii were identified. They belonged to di‐, tri‐, tetra‐, penta‐, and hexanucleotide repeats (50%, 22.7%, 11.3%, 9%, and 7%, respectively). Each locus was checked for homology in the assembled P. macrura and P. hutchisonii genomes using BioEdit version 7.0.9.0 (Hall, 1999). In total, 70 cross‐species microsatellite loci were selected for primer design and synthesis (Majorbio Company, Shanghai, China). PCR amplification was performed with three primers: a sequence‐specific forward primer with an M13(−21) tail at its 5′ end, a sequence‐specific reverse primer, and the universal fluorescent‐labeled M13(–21) primer (FAM, HEX, or TAMRA; Invitrogen, Guangzhou, China) (Schuelke, 2000). Amplification was performed in 10‐μL reactions that include: 2 μL 5× buffer mix (TaKaRa Biotechnology Co., Dalian, China), 0.8 μL of dNTP, 0.1 μL of Taq (PrimeSTAR, TaKaRa Biotechnology Co.), 1 μL 0.2 mM aqueous solution for each of three primers (3 μL in total), 30–50 ng of template DNA in 1 μL of aqueous solution, and 3.1 μL of ddH2O. PCR conditions include: 3 min at 94°C, followed by 35 cycles of denaturation at 94°C for 3 min, denaturation of 94°C for 30 s, annealing of 60°C for 30 s, and DNA extension at 72°C for 5 min. The PCR products were scanned by an ABI PRISM 3100 Genetic Analyzer using GeneScan 500 LIZ internal size standard (Applied Biosystems, Waltham, Massachusetts, USA). The size of the alleles at each locus was scored by GeneMarker version 1.5 (SoftGenetics, State College, Pennsylvania, USA). Preliminary PCR screening resulted in the successful amplification of 46 of the 70 primer pairs; one clear band was generated for each of the 46 primer pairs in P. raimondii. These primer pairs (Table 1, Appendix 2) were then screened for polymorphisms across nine individuals selected from four different P. raimondii populations (Cachi, Huascar, Pachapaqui, and Choconchaca; Appendix 1). Twelve primer pairs (Table 1) producing clear and polymorphic bands were then used to screen 84 P. raimondii individuals collected from four populations in Peru (Table 2, Appendix 1).
Table 1

Characteristics of 12 polymorphic microsatellite loci identified in Puya raimondii.

Locusa Primer sequences (5′–3′)Repeat motifAllele size range (bp)Fluorescent dyeGenBank accession no.
Puya‐002 F: CTCTCTGCGCCATCACATTA (GGT)8…(GGTGGA)6 199–216FAM MN218732
R: TCGTGATCGGGTTGATCTT
Puya‐009 F: TATGTACCCGATCCGAACC (ATTTT)6…(TTCGGG)4 207–222FAM MN218735
R: TACCCGACCCGACCAAATA
Puya‐012 F: CTTTCGTATGGGAAGGTGA (TAAAA)4…(CT)6 246–263HEX MN218737
R: CGAGCCAAGAAAGATGAAGG
Puya‐016 F: GTCCTCGACATCTTCCCAGA (AAAG)5 180–194TAMRA MN218740
R: TGCGGAACGAAAAATAGATG
Puya‐037 F: GCTTTGGGTTCAACGGTCTA (TTC)5…(GA)8 240–248HEX MN218753
R: GCGGAGACTAAGAGGACGAA
Puya‐039 F: GCCCATGTATGTGCGTGTAT (GA)7 190–202FAM MN218754
R: CCCTCCTCCACTGCTTCC
Puya‐042 F: AAGGAATTATGAGCGCATGG (AG)19 180–194HEX MN218755
R: TGTGAACCCACAGAATCAGC
Puya‐046 F: AGGGCTCCTTCTCTCTCCTG (CT)12 200–213HEX MN218756
R: GGCCAGAGGTAAAGGGGTAG
Puya‐049 F: GCAAAATACACGAAGGAAGC (TC)6 210–222HEX MN218757
R: GGGATGGTGAAGAAATGGTG
Puya‐052 F: TGCGGAAACAGAGAAGAACC (CT)13 202–210TAMRA MN218760
R: CTGCTGCAGCTCCTCTTAGG
Puya‐065 F: TTGGGACTTCCAGGTCACTC (CT)7…(CT)7 272–284FAM MN218769
R: GAGAGAAGGAGCCCTCATCA
Puya‐069 F: AGGGGAGCTCTCTTGGAGAC (TA)7 187–212TAMRA MN218772
R: AAACAGAAACCAACCGCAAC

Annealing temperature for all loci was 60°C.

Table 2

Genetic diversity of 12 microsatellite loci in four populations of Puya raimondii.a

LocusCachi (N = 15)Huascar (N = 14)Pachapaqui (N = 28)Choconchaca (N = 27)
A H o H e f A H o H e f A H o H e f A H o H e f
Puya‐00220.06670.066730.28570.31480.095760.32140.47730.3306b 20.03700.0370
Puya‐00920.06670.066730.25000.2355−0.064530.10710.23050.5398b 30.07410.0734−0.0097
Puya‐01240.20000.30570.353820.07140.071430.14810.20480.280340.11110.14330.2277
Puya‐01610.00000.000010.00000.000030.14810.26210.4394b 30.11110.17400.3659
Puya‐03710.00000.000020.07140.19840.648640.17860.20190.117630.11110.17540.3710
Puya‐03930.06670.19080.6585b 40.25000.30800.195150.45830.54880.167820.07410.0727−0.0196
Puya‐04210.00000.000010.00000.000030.42860.51620.172440.14810.1433−0.0348
Puya‐04640.26670.2506−0.066750.35710.61380.4273b 50.35710.46560.2362b 10.00000.0000
Puya‐04920.13330.1287−0.037030.21430.26190.187560.89290.7662−0.168830.07410.0734−0.0097
Puya‐05220.13330.1287−0.037020.16670.1594−0.047630.44440.4354−0.021330.15380.21190.2780
Puya‐06520.06670.066730.07140.26190.7347b 50.07140.26300.7320b 10.00000.0000
Puya‐06930.15380.1508−0.021330.18180.25540.298220.08000.15020.472520.03700.0370
Overall 0.09610.11290.1558 0.15990.22340.3010 0.3030.37680.1985 0.07760.09510.1820

— = not applicable; A = number of alleles; f = inbreeding coefficient; H e = unbiased expected heterozygosity; H o = observed heterozygosity; N = number of individuals.

See Appendix 1 for locality and voucher information.

Deviation from Hardy–Weinberg equilibrium after Bonferroni correction (P < 0.05).

Characteristics of 12 polymorphic microsatellite loci identified in Puya raimondii. Annealing temperature for all loci was 60°C. Genetic diversity of 12 microsatellite loci in four populations of Puya raimondii.a — = not applicable; A = number of alleles; f = inbreeding coefficient; H e = unbiased expected heterozygosity; H o = observed heterozygosity; N = number of individuals. See Appendix 1 for locality and voucher information. Deviation from Hardy–Weinberg equilibrium after Bonferroni correction (P < 0.05). GenAlEx 6.51b2 (Peakall and Smouse, 2012) was used to calculate the number of alleles and the observed and expected levels of heterozygosity. The fixation index (F) was calculated using GENEPOP 4.3 (Rousset, 2008). The deviation from Hardy–Weinberg equilibrium and genotypic linkage disequilibrium among all pairs of loci within populations were estimated using GENEPOP 4.3 based on default parameter settings. We found no consistent deviation from Hardy–Weinberg equilibrium or linkage disequilibrium for any loci within the populations. The levels of observed heterozygosity and expected heterozygosity of the P. raimondii populations varied from 0.000 to 0.8929 and from 0.000 to 0.7662, respectively (Table 2). For the 12 polymorphic loci, the number of alleles per locus ranged from one to six (Table 2), with loci Puya‐002 and Puya‐049 having the highest number of alleles. Cross‐species amplification success rates in P. hutchisonii, P. macropoda, and P. macrura indicate that 14–18 of the 46 microsatellite loci developed in P. raimondii could also be successfully amplified in this set of taxa (Table 3). Among these successfully cross‐amplified loci, six, 14, and 13 loci are polymorphic and 11, four, and two are monomorphic for P. hutchisonii, P. macropoda, and P. macrura, respectively. These results demonstrate that these primer pairs may be of broad utility throughout the genus Puya.
Table 3

Cross‐species amplification success of microsatellites developed in Puya raimondii in three related Puya species.a

Locus Puya macrura (N = 5) Puya macropoda (N = 4) Puya hutchisonii (N = 2)
A H o H e Allele size range (bp) A H o H e Allele size range (bp) A H o H e Allele size range (bp)
Puya‐0026 1.00000.8889209–22420.50000.4286210–2131 215
Puya‐0047 0.80000.9111197–22730.50000.7143209–2152 1.0000 0.6667 211–213
Puya‐0082 1.0000 0.6667 244–248
Puya‐0143 0.20000.6000263–27121.00000.5714263–267
Puya‐01512141 210
Puya‐0162 0.20000.2000242–24621.00000.5714242–2462 1.0000 0.6667 242–246
Puya‐0172 0.50000.5000244–24810.00000.00002441 246
Puya‐0223 0.20000.3778163–19360.75000.9286169–2022 1.0000 0.6667 182–188
Puya‐0283 0.66670.6000208–22630.00000.7143220–2261 221
Puya‐0305 0.80000.8444243–25050.75000.8571240–2541 246
Puya‐0314 0.60000.7778260–26920.33330.3333260–2631 259
Puya‐0331 30613061 305
Puya‐0341 2431243
Puya‐0371 245
Puya‐0422 1.0000 0.6667 177–181
Puya‐04920.50000.4286213–2151 215
Puya‐05220.00000.5714240–2422 1.0000 0.6667 227–241
Puya‐0532 0.00000.6667266–26830.50000.6786264–270
Puya‐0544 0.40000.5333198–20830.25000.7500206–2091 207
Puya‐0554 0.40000.8000172–18430.50000.6071175–184
Puya‐0675 0.80000.7556254–26620.25000.2500254–2581 257
Overall0.31270.40260.32540.40020.28570.1905

— = not applicable; A = number of alleles; H e = unbiased expected heterozygosity; H o = observed heterozygosity; N = sample size.

See Appendix 1 for locality and voucher information.

Cross‐species amplification success of microsatellites developed in Puya raimondii in three related Puya species.a — = not applicable; A = number of alleles; H e = unbiased expected heterozygosity; H o = observed heterozygosity; N = sample size. See Appendix 1 for locality and voucher information.

Conclusions

The design of microsatellite primers for P. raimondii will greatly assist future efforts to assess the ecological and genetic ramifications of small population size in this species. This study not only contributes directly to the development of future conservation strategies for P. raimondii but also may benefit similar efforts in closely related taxa.

Author Contributions

X.J.G. and M.L.S. designed the experiment, L.T. and Y.Q.Z. conducted genetic work, and Z.F.W. and K.S.B. conducted genetic analyses. All authors assisted with manuscript preparation and approved the final manuscript.
Species Population nameLocation N Geographic coordinates Elevation (m)Voucher (Herbarium)a BioProject no.b
Puya hutchisonii L. B. Sm.* Prov. Huaylas277.811W, 9.046S4250Xue‐Jun Ge et al. 221 (USM)SRR10028124/PRJNA562611
Puya macropoda L. B. Sm.Prov. Yungay477.64W, 9.07S3850Xue‐Jun Ge et al. 32 (USM)
Puya macrura Mez* Prov. Huari577.183W, 9.319S3450Xue‐Jun Ge et al. 165 (USM)SRR10023783/PRJNA562459
Puya raimondii HarmsCachiProv. Chupaca, Yanacancha1575.475W, 12.247S4124G. Prado et al. s.n. (USM‐315310)
Puya raimondii HuascarProv. Chupaca, Yanacancha1475.440W, 12.236S4170G. Prado et al. s.n. (USM‐315311)
Puya raimondii * PachapaquiProv. Bolognesi, Aquia2877.088W, 9.958S3800M. Suni et al. s.n. (USM‐315307)SRR10023784/PRJNA562459
Puya raimondii ChoconchacaProv. Lampa, Lampa2770.088W, 15.258S3962L. Tumi et al. s.n. (USM‐315308)

N = number of individuals.

Vouchers are deposited at the Herbarium of the Museo de Historia Natural of Universidad Nacional Mayor de San Marcos (USM), Lima, Peru.

NCBI Sequence Read Archive (SRA)/BioProject no. for genome skimming data.

Species used for genome skimming.

Locusa Primer sequences (5′–3′)Repeat motifAllele size range (bp)Fluorescent dyeGenBank accession no.
Puya‐004 F: GTCCACGCAAAAAGGATCA (TTCCCG)6…(CT)12 261TAMRA MN218733
R: GAGGGGAATTGGAAACCCTA
Puya‐008 F: AGAGGGTTCACCGTAGAGCA (TATGTG)4 229FAM MN218734
R: CGCAGGTAGGAGAAGAGCTG
Puya‐010 F: AGAAAATTCCCAAGGCTGTG (TCCTAT)7 237FAM MN218736
R: GGAATAGCCAGCCAAGGTAG
Puya‐014 F: TGAAGATGCTGTGTGCTGTG (GCAA)4 244FAM MN218738
R: TTTGCCCTTTGGACTCATCT
Puya‐015 F: ACGCTTCAGAACTCAAGAATC (TAAT)4 193FAM MN218739
R: CGACCGTAGGAGGAAGAGAA
Puya‐017 F: TCCCCTCCTTTTGCTAGAAC (TTTC)4 228HEX MN218741
R: TCGGTGAAGCCCATATGAA
Puya‐018 F: CGCAACTCTGCGAACTGTAG (AGAA)5 227FAM MN218742
R: GAAGGTTCTCCACCACCAAA
Puya‐019 F: CGGCAACCAGAAAGAAGAAG (TTC)13 230FAM MN218743
R: TTCTCTCCCTTCTCTCGGCT
Puya‐021 F: ATGAGGAAGCAGCTCAAGGAGA (TCG)5 240FAM MN218744
R: TATTTTGAACCGATCCGAGG
Puya‐022 F: ACTTGCACCTCGTCAGCAC (CTC)7 156FAM MN218745
R: GGCGAAGCTTGATGAGAGAA
Puya‐023 F: AAAACGATACCAAAATCCATGT (TCA)6 229FAM MN218746
R: GGTGGTGCAATTAATTTGGTG
Puya‐025 F: TTCATGTTGCATTGTGCTGA (TTG)7 152FAM MN218747
R: TGAACCCATGCAGAACAAAC
Puya‐028 F: TGATCAGCCGAATACATTGC (TTC)10 205FAM MN218748
R: GCCAATGCAATTCCCTTCTA
Puya‐030 F: AATTCGATTCCCCAAAGTCC (GTC)8 232TAMRA MN218749
R: GACTCGTCGTTGAGGAGCAC
Puya‐031 F: ATTCGGCTGAAGGTGCAGTA (CTT)12 235TAMRA MN218750
R: ATGCGAGCTTGTAAGGAAGC
Puya‐033 F: CCGAATTTGCCACAAATCTT (AGA)5 291TAMRA MN218751
R: AAAGGGTTCAGGCGATGTTA
Puya‐034 F: ATAGAGGCGACCATTTGTCA (GAT)7 226FAM MN218752
R: TTGCTTGTGGTGCTATTTGC
Puya‐040 F: AAGGAATTATGAGCGCATGG (AG)19 182FAM MN218755
R: TGTGAACCCACAGAATCAGC
Puya‐044 F: AGGGCTCCTTCTCTCTCCTG (CT)12 205FAM MN218756
R: GGCCAGAGGTAAAGGGGTAG
Puya‐048 F: TGCAAAATACACGAAGGAAGC (TC)6 216FAM MN218757
R: GGGATGGTGAAGAAATGGTG
Puya‐050 F: TGTATTATCCCTTCAGAACTTGC (CT)7 181FAM MN218758
R: TCGCATACATAGGACGAGTCA
Puya‐051 F: AACACCGAAGGTGGTTCTTG (TG)12 199FAM MN218759
R: GCCTAGTTGCTTCGCATTTC
Puya‐053 F: GTTTTCGATGCCGATTGATT (AT)9 246TAMRA MN218761
R: GTCTTTGTGGCTGAGCGATT
Puya‐054 F: TCTTTACGTCCACACCTCCA (CA)7 190FAM MN218762
R: TCTCTTCATCAGCGGGATCT
Puya‐055 F: AGCTCGGAGGAGGGTCTTAG (CTC)8 160FAM MN218763
R: CGAGATGAGCCTCAGAATCC
Puya‐057 F: ACGGCAGCTCTATCCTCGTA (TCG)8 181TAMRA MN218764
R: GAGGACGTGAAGGTGTGGAT
Puya‐059 F: ATCCGTTGTCGTCGGAATAG (GCC)5 234FAM MN218765
R: CTCCCTCTCTCTGTGGTTCG
Puya‐060 F: CTACCGTTGATTCCCTGGAC (TTC)8 228FAM MN218766
R: CTCCGCCTACGAACAAAAAC
Puya‐062 F: CCTTCCAACTCCTCAGCTTG (TTG)9 246FAM MN218767
R: CAATCACTCTGGCTCACGAC
Puya‐064 F: GGTGTGTGGTGTTGTCAAGG (AGG)11 226FAM MN218768
R: GCTTCAAGATTTGTGCAGATG
Puya‐066 F: TTGGGACTTCCAGGTCACTC (CT)7…(CT)7 272FAM MN218769
R: GAGAGAAGGAGCCCTCATCA
Puya‐067 F: TCAGCGTTTGCTTATCGTTG (AG)6 236TAMRA MN218770
R: TTTCCAGTGATTTGGGGTGT
Puya‐068 F: GGAAATGAGGTGTCGGTTGT (AT)11 170FAM MN218771
R: GCTTGCTTTGTTCTTTGGCT
Puya‐070 F: ATCCTGCAACCAAACAGGAC (TA)12 205FAM MN218773

Annealing temperature for all loci was 60°C.

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