Morphological and Isozyme Characterization of Common Papaya in Costa Rica

D'Eeckenbrugge, Géo Coppens; Restrepo, María Eugenia Molina; Jiménez, Daniela Azofeifa; Mora, Edwin Daniel Capa

doi:10.17660/actahortic.2007.740.11

Cited by 13 publications

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“…To what degree do natural papaya populations in Costa Rica vary morphologically?.— We observed a wide range of morphological diversity throughout the natural populations of papaya in Costa Rica similar to previous reports (d'Eeckenbrugge et al 2007). Most vegetative traits varied among regions, while reproductive variation was limited primarily to seed and flower color and fruit shape.…”

supporting

confidence: 92%

“…Previous research has focused upon characterizing the genetic (Pérez et al 2007) and/or morphological diversity of papaya growing within natural areas (d'Eeckenbrugge et al 2007). Pérez et al (2007) analyzed genetic data from 15 microsatellite markers using papaya from 12 countries, many of those from the Caribbean and Central America, and observed a high frequency of rare alleles within Costa Rican germplasm, although little genetic differentiation existed among samples collected from the Caribbean and Pacific coasts.…”

mentioning

confidence: 99%

“…Pérez et al (2007) analyzed genetic data from 15 microsatellite markers using papaya from 12 countries, many of those from the Caribbean and Central America, and observed a high frequency of rare alleles within Costa Rican germplasm, although little genetic differentiation existed among samples collected from the Caribbean and Pacific coasts. Only one study (d'Eeckenbrugge et al 2007) has compared genetic data (isozyme data) with that of morphological data from plants within natural populations from Costa Rica. Although a wide range of morphological diversity was observed among the 32 feral individuals sampled, very little genetic diversity existed among them (d'Eeckenbrugge et al 2007).…”

mentioning

confidence: 99%

“…Only one study (d'Eeckenbrugge et al 2007) has compared genetic data (isozyme data) with that of morphological data from plants within natural populations from Costa Rica. Although a wide range of morphological diversity was observed among the 32 feral individuals sampled, very little genetic diversity existed among them (d'Eeckenbrugge et al 2007).…”

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confidence: 99%

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The Structure of Morphological and Genetic Diversity in Natural Populations of Carica papaya (Caricaceae) in Costa Rica

et al. 2011

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In Costa Rica, dioecious Carica papaya has been observed growing in disturbed areas and within secondary lowland forests. Such populations can serve as a reservoir of genetic and morphological diversity for this tropical fruit crop. We quantify the levels and patterns of the diversity of naturally occurring populations of C. papaya and address the demographic history of these populations. We measured 29 vegetative and reproductive morphological traits in situ from 252 plants and found significant heterogeneity among regional populations in the majority of these traits. Significant variation was found among regional populations with respect to fruit size and shape, with plants in the Nicoya Peninsula possessing smaller, less fleshy fruit, a characteristic of previously described wild populations of papaya. We then assessed the levels and patterns of genetic diversity in 164 plants from natural populations and 20 cultivars. Natural populations exhibit a deficiency of heterozygotes; however, this is much more pronounced within the cultivars. Although there is little genetic differentiation among natural populations, we did find evidence of cryptic genetic population structure. Analyses of population demography indicate that these natural populations have undergone a recent genetic bottleneck, followed by recent population expansion, possibly promoted by the transformation of the Costa Rican landscape for agricultural use.Abstract in Spanish is available in the online version of this article.

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confidence: 92%

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confidence: 99%

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confidence: 99%

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The Structure of Morphological and Genetic Diversity in Natural Populations of Carica papaya (Caricaceae) in Costa Rica

et al. 2011

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“…Moreover, this plant has been proposed as being domesticated in this area by the Mayans (Carvalho and Renner, 2012). Finally, when comparing our estimates of genetic diversity with the few other studies of natural populations of papaya, both in Costa Rica (Coppens d'Eeckenbrugge et al, 2007;Brown et al, 2012), we found higher values in Mexico. However, these Costa Rican natural populations are considered possible feral plants, i.e.…”

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confidence: 61%

Genetic diversity and structure of wild populations ofCarica papayain Northern Mesoamerica inferred by nuclear microsatellites and chloroplast markers

Chávez‐Pesqueira

Núñez‐Farfán

2016

Ann Bot

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Background and aims Few studies have evaluated the genetic structure and evolutionary history of wild varieties of important crop species. The wild papaya (Carica papaya) is a key element of early successional tropical and sub-tropical forests in Mexico, and constitutes the genetic reservoir for evolutionary potential of the species. In this study we aimed to determine how diverse and structured is the genetic variability of wild populations of C. papaya in Northern Mesoamerica. Moreover, we assessed if genetic structure and evolutionary history coincide with hypothetized (1) pre-Pleistocene events (Isthmus of Tehuantepec sinking), (2) Pleistocene refugia or (3) recent patterns.Methods We used six nuclear and two chloroplast (cp) DNA markers to assess the genetic diversity and phylogeographical structure of 19 wild populations of C. papaya in its natural distribution in Northern Mesoamerica.Key Results We found high genetic diversity (H o ¼ 0Á681 for nuclear markers, and h ¼ 0Á701 for cpDNA markers) and gene flow between populations of C. papaya (migration r up to 420 km). A lack of phylogeographical structure was found with the cpDNA markers (NST < GST), whereas a recent population structure was inferred with the nuclear markers. Evidence indicates that pre-Pleistocene events or refugia did not play an important role in the genetic structuring of wild papaya.Conclusions Because of its life history characteristics and lack of an ancient phylogeographical structure found with the cpDNA markers, we suggest that C. papaya was dispersed throughout the lowland rain forests of Mexico (along the coastal plains and foothills of Sierras). This scenario supports the hypothesis that tropical forests in Northern Mesoamerica did not experience important climate fluctuations during the Pleistocene, and that the life history of C. papaya could have promoted long-distance dispersal and rapid colonization of lowland rainforests. Moreover, the results obtained with the nuclear markers suggest recent human disturbances. The fragmentation of tropical habitats in Northern Mesoamerica appears to be the main driver of genetic structuring, and the major threat to the dispersion and survival of the species in the wild.

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Phenotypic and Genetic Diversity of Papaya

Moore

2013

Genetics and Genomics of Papaya

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Morphological and Isozyme Characterization of Common Papaya in Costa Rica

Cited by 13 publications

References 0 publications

The Structure of Morphological and Genetic Diversity in Natural Populations of Carica papaya (Caricaceae) in Costa Rica

The Structure of Morphological and Genetic Diversity in Natural Populations of Carica papaya (Caricaceae) in Costa Rica

Genetic diversity and structure of wild populations ofCarica papayain Northern Mesoamerica inferred by nuclear microsatellites and chloroplast markers

Phenotypic and Genetic Diversity of Papaya

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