Morphological, SSR and ISSR Marker Based Genetic Diversity Assessment of Mountain Papaya Germplasm in Comparison with Carica Papaya
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-1DWQ6FL)RXQGDWLRQ6UL/DQND DOI: http://dx.doi.org/10.4038/jnsfsr.v45i3.8190 RESEARCH ARTICLE Morphological, SSR and ISSR marker based genetic diversity assessment of mountain papaya germplasm in comparison with Carica papaya W.A.D.L.R. Warnakula 1, N.S. Kottearachchi 1* and K. Yakandawala 2 1 Department of Biotechnology, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, Gonawila (NWP). 2 Department of Horticulture and Landscape Gardening, Faculty of Agriculture and Plantation Management, Wayamba University of Sri Lanka, Makandura, Gonawila (NWP). Revised: 02 October 2016; Accepted: 16 February 2017 Abstract: The genetic diversity in papaya cultivars is 3DSD\DLVDJRRGVRXUFHRIYLWDPLQVDQGLWLVZLGHO\JURZQ essentially important as it provides the basis for varietal for consumption as a fresh fruit and for use in drinks, LPSURYHPHQW,QWKLVUHJDUGDVWXG\ZDVLQLWLDWHGWRDVVHVVWKH jams, candies, etc. Papaya also has pharmaceutical and genetic diversity of the commercial Carica papaya cultivars industrial values due to its proteins and alkaloids. Of in Sri Lanka and to introduce mountain papaya ( Vasconcellea these, papain is the most important industrially valuable cundinamarcensis ), ZKLFKLVUHSRUWHGWRFRQWDLQFROGUHVLVWDQFH DQG SDSD\D ULQJ VSRW YLUXV 35693 UHVLVWDQW WUDLW 7ZHQW\ SURWHRO\WLFHQ]\PHWKDWLVSURGXFHGLQWKHPLON\ODWH[RI one accessions of Carica papaya DQGPRXQWDLQSDSD\DZHUH green, unripe papaya fruits (Moussaoui et al. , 2001). In assessed by morphological, simple sequence repeat (SSR) and Sri Lanka there are several C. papaya cultivars including inter simple sequence repeat (ISSR) markers. A total of 33 introduced varieties from other countries, hybrid varieties DOOHOHVZHUHJHQHUDWHGZLWKDQDYHUDJHIUHTXHQF\RIDOOHOHV and local-traditional cultivars. Currently 7,108 ha are per marker from 11 SSR and 2 ISSR markers. Morphological under cultivation and the annual production is 84,606 mt and molecular marker based cluster analyses revealed that (DOA, 2014). WKHUHZDVQRFOHDUGLVWLQFWLRQDPRQJWKH C. papaya cultivars JURZQ LQ GLIIHUHQW JHRJUDSKLFDO DUHDV LQ 6UL /DQND ZKLOH The family Caricaceae FRPSULVHV ¿YH JHQHUD DQG C. papaya PRXQWDLQSDSD\DZDVKLJKO\GLVWLQFWIURPWKHRWKHU DERXWíVSHFLHV &DUYDOKR et al., 2015). Previously, accessions. Except three SSR markers, all the other markers the genus Carica ZHUH SRO\PRUSKLF EHWZHHQ PRXQWDLQ SDSD\D DQG C. papaya FRQWDLQHG VSHFLHV DQG IROORZLQJ DFFHVVLRQV2IWKHDOOHOHVSURGXFHGDOOHOHVZHUHFRPPRQ the recommendation of Badillo (2000) Carica ZDVVSOLW for both C. papaya and mountain papaya indicating the LQWR WZR JHQHUD FUHDWLQJ DQ DGGLWLRQDO JHQXV FDOOHG potential relatedness to C. papaya. This investigation revealed Vasconcellea FRPSULVLQJZLOGVSHFLHV3UHVHQWO\WKH both the genetic diversity and the relatedness of mountain genus Carica contains only one species, Carica papaya , SDSD\DZLWK C. papaya so as to use it as a potential source for ZKLFK LV WKH PRVW HFRQRPLFDOO\ YDOXDEOH Caricaceae the improvement of C. papaya by hybridisation. VSHFLHVZRUOGZLGH Keywords: Carica papaya , ISSR markers, morphological The mountain papaya plant has been studied by characterisation, mountain papaya, SSR markers. PDQ\ VFLHQWLVWV LQ WKH ZRUOG GXH WR LWV HFRQRPLFDOO\ important traits such as the potential for cold tolerance INTRODUCTION (Muthulakshmi et al. , 2007), papaya ring spot virus (PRSV-P) resistance (Dillon et al ., 2006), higher sugar Most of the Caricaceae species are considered as FRQWHQW RI WKH IUXLW 'UHZ et al. ,1998), and genetic unexploited species except for Carica papaya /ZKLFK relatedness to C. papaya 2¶%ULHQ 'UHZ $V LV FRPPHUFLDOO\ JURZQ LQ PDQ\ SDUWV RI WKH ZRUOG the closest relative of C. papaya species, mountain * Corresponding author ( [email protected] ) W.A.D.L.R. Warnakula et al. papaya has the likelihood to hybridise and exchange In Sri Lanka, there are four main types of commercial JHQHVZKLFKDUHDVVRFLDWHGZLWKHFRQRPLFDOO\LPSRUWDQW papaya: Rathne, Sinta, Red Lady and local/ traditional traits (Badillo, 2000). Both Carica and Vasconcellea are varieties, and their genetic relatedness has not been genetically diploids and share the same chromosome studied at molecular level using simple sequence repeat number, 2n = 18 (Storey, 1976). Several research studies (SSR) and inter simple sequence repeat (ISSR) markers. have indicated that pollination of C. papayaZLWKSROOHQ Allelic variation of the economically important traits IURPZLOGSDSD\DV DQG vice versa ) successfully facilitate needs to be utilised in breeding programmes and they can WKH IHUWLOLVDWLRQ 0DQVKDUGW :HQVODII 'UHZ be revealed by SSR and ISSR marker based assessments. et al ., 1998). Although mountain papaya naturally possesses a number of desirable traits, its proper characterisation has not 0RXQWDLQ SDSD\D H[LVWHG LQ WKH PRQWDQH ]RQH RI EHHQ FRQGXFWHG DQG QHJOHFWHG DV LW JURZV LQ WKH ZLOG Sri Lanka has been recognised as Carica pubescence 7KHUHIRUHWKLVUHVHDUFKVWXG\ZDVDLPHGDWDVVHVVLQJWKH in the Revised Handbook to the Flora of Ceylon genetic diversity of the commercial papaya accession in (Dasanayake, 1995) and in the Check List of the 6UL/DQNDDORQJZLWKPRXQWDLQSDSD\DDQGWRH[SORUHLWV )ORZHULQJ3ODQWVRI6UL/DQND 6HQDUDWQD ,WKDV potential traits to improve C. papaya accessions in the EHHQ UHSRUWHG LQ WKH +DOJROOD (VWDWH ZKLFK LV ORFDWHG country. LQ WKH VRXWKHDVWHUQ HGJH RI WKH .HJDOOH 'LVWULFW DQG FORVH WR WKH ZHVWHUQ ERXQGDU\ RI WKH 1XZDUD (OL\D METHODOLOGY District (Weerakoon et al ., 2009) as an uncultivated papaya species. Mountain papaya is a sparsely branched Plant materials herbaceous tree, habituated in the highest elevation OHYHO LQ 6KDQWKLSXUD 1XZDUD (OL\D7D[RQRP\ RI WKH /HDI VDPSOHV ZHUH FROOHFWHG IURP JHQRW\SHV RI mountain papaya accession in Sri Lanka has not been C. papaya distributed in the Central, North Western explained clearly and naturally hybridised genotypes and Western provinces of Sri Lanka and three mountain have not been reported in Sri Lanka. SDSD\D VDPSOHV ZHUH FROOHFWHG IURP 6KDQWKLSXUD Table 1: Details of the papaya germplasm and their locations 6DPSOHQR *HUPSODVP &RGH 6RXUFH 'LVWULFW 5HG/DG\ 5'/ .DWXJDVWKRWD .DQG\ /RFDO /&/ .DWXJDVWKRWD .DQG\ 3 Sinta SIN01 PVIC, Homagama Colombo 4 Breeders line BRL01 PVIC, Homagama Colombo 5 Breeders line BRL02 PVIC, Homagama Colombo 6 Local LCL02 PVIC, Homagama Colombo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¿FDWLRQ6WDWLRQ+5)+RUWLFXOWXUDO5HVHDUFK)DUP RARDC - Regional Agricultural Research and Development Centre September 2017 Journal of the National Science Foundation of Sri Lanka 45(3) Genetic diversity assessment of mountain papaya 257 1XZDUD(OL\D6UL/DQNDIRU'1$H[WUDFWLRQ7KHORFDO descriptor list published by the International Board for or common names ascribed to the individual accessions 3ODQW*HQHWLF5HVRXUFHV ,%3*5 $VWKHVDPSOHV ZHUH UHFRUGHG DV D UHIHUHQFHWR WKH PDWHULDOFROOHFWHG ZHUHFROOHFWHGIURPGLIIHUHQWJHRJUDSKLFDODUHDVLQWKH DQGHDFKDFFHVVLRQZDVDVVLJQHGDWD[RQFRGHEDVHGRQ FRXQWU\RQO\WKHTXDOLWDWLYHWUDLWVZHUHDFFRXQWHGLQWKLV their local name (Table 1). VWXG\ IROORZLQJ WKH VWXG\ FRQGXFWHG E\ 0DGDUERNXV and Ranghoo-Sanmukhiya (2012). The sex of each Morphological analysis YDULHW\ ZDV GHWHUPLQHG E\ WKH ÀRUDO PRUSKRORJ\ -LPpQH] et al. , 2012). Visual morphological characters A total of 14 vegetative and reproductive characters RIWKHSODQWVSHFLPHQVRIPRXQWDLQSDSD\DZHUHIXUWKHU ZHUH REVHUYHG in situ from the selected papaya FODUL¿HG E\ H[DPLQLQJ GLJLWDO LPDJHV RI KHUEDULXP DFFHVVLRQV 7DEOH $VFRUHZDVDVVLJQHG 7DEOH VSHFLPHQVLQWKH.HZ+HUEDULXPGDWDEDVH KWWSZZZ WRHDFKPRUSKRORJLFDOFKDUDFWHUIROORZLQJWKHSDSD\D NHZRUJVFLHQFH ). Table 2: 4XDOLWDWLYHWUDLWVDQGWKHLUUHVSHFWLYHVFRUH 1R 4XDOLWDWLYHWUDLW 6FRUHV 1 Stem type 1 - Single, 2 - Branched 6WHPFRORXU /LJKWJUH\*UH\LVKEURZQ 3 Stem pigmentation 1 - Mostly upper, 2 - Indiscriminate &RORXURIPDWXUHOHDISHWLROH 3DOHJUHHQ'DUNJUHHQ5HGSXUSOH*UHHQSXUSOH 5 Waxiness on leaf surface 1 - Present, 2 - Absent 6 Leaf segments (lobes) 1 - Nine segments, 2 - Seven segments 7\SHRIÀRZHULQJ 6ROLWDU\,QÀRUHVFHQFH &RORXURILQÀRUHVFHQFHVWDON &UHDP<HOORZSXUSOH*UHHQLVK &RORXURIÀRZHU *UHHQLVK'DUNJUHHQ )UXLWVKDSH 2EORQJ5HQLIRUP2YDO(ORQJDWH&OXE$FURQ*OREXODU )UXLWVNLQFRORXU 'HHS\HOORZ<HOORZ2UDQJH )UXLWÀHVKFRORXU %ULJKW\HOORZ2UDQJH5HGGLVKRUDQJH/LJKW\HOORZ 6HHGFRORXU %ODFN%URZQEODFN7DQ 14 Flesh aroma 1 - Mild, 2 - Moderate, 3 - Strong Genomic DNA extraction IRU PLQ 7KH SUHFLSLWDWHG '1$ ZDV ZDVKHG ZLWK 70 % ice-cold ethanol by centrifugation at 15,000 rpm $ KHDOWK\ WHQGHU OHDI ZDV XVHG IRU H[WUDFWLQJ '1$ IRUDQRWKHUPLQ7KH'1$SHOOHWVZHUHWKHQGULHGDQG )UHVKOHDIWLVVXHV PJ ZHUHJURXQGLQȝ/RI UHVXVSHQGHGLQȝ/RI7(EXIIHUDQGVWRUHGDW& cetyl trimethyl ammonium bromide (CTAB) extraction before using for SSR and ISSR analyses. buffer [2 % CTAB, 5 M NaCl, 0.5 M ethylene diamine WHWUDDFHWLFDFLG ('7$ DWS+7ULV+&/ WUL]PDEDVH PCR assay hydrochloric acid) at pH 8 and 2 % ß-mercaptoethanol] XVLQJDPRUWDUDQGSHVWOH 'R\OH 'R\OH 7KH 3&5DPSOL¿FDWLRQRIWKHH[WUDFWHG'1$ZDVFRQGXFWHG H[WUDFW ZDV WUDQVIHUUHG WR D FOHDQ HSSHQGRUI