Genealogical relationships among cultivated avocado as revealed through RFLP analyses

Davis, Joel

doi:10.1093/jhered/89.4.319

Cited by 52 publications

(42 citation statements)

References 8 publications

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“…However, our results indicate that each of these eight species can be recognized by a unique combination of morphological characters. In contrast to previous proposals (Popenoe 1941;Kopp 1966;Williams 1977;Davies et al 1998;Fiedler et al 1998), we determined that the three avocado races differ from each other enough to be considered Persea species, as suggested elsewhere (Bergh and Ellstrand 1987;Scora and Bergh 1990). Zentmyer and Schieber (1992) consider that P. nubigena, P. steyermarkii, and P. zentmyerii, are species different from P. americana.…”

Section: Resultsmentioning

confidence: 74%

Persea (avocados) Phylogenetic Analysis Based on Morphological Characters: Hypothesis of Species Relationships

Rojas

Terrazas

López–Mata

2006

Genet Resour Crop Evol

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The genus Persea consists of two subgenera, Persea (known as avocados) and Eriodaphne (known as aguacatillos, avocado-like species). The present study aimed to determine whether the genus Persea is a monophyletic group and whether the division into two subgenera is an artificial one. In conjunction with these goals, a hypothesis of the phylogenetic relationships among Persea species is proposed. Our results suggest that Persea is not a monophyletic group. Two clades of Persea can be recognized. The results suggest that Eriodaphne and Persea should be considered to be independent genera. Various leaf and floral characters contributed for separation into groups. The definition of Eriodaphne is based on fruit color, sessile glands at the base of the stamens, vein prominence and leaf shape. Persea is more closely related to genera Nectandra and Ocotea than Eriodaphne. The 11 species included in Persea are recognized as species. The group is defined by fruit flavor, mature leaf color, number of tertiary divergent veins, and pubescent bracts in the inflorescence. Within this group, a clade of six species in which P. guatemalensis is included is recovered by seed shape, venation pattern relief, and number of fruits per cluster. Moreover, the seed shape supports the separation of P. floccosa and P. zentmyerii. A molecular character analysis is necessary to support the Persea clades proposed herein. Nevertheless the phylogenetic relationships revealed by this study provide new bases for the selection and conservation of the species Persea.

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Section: Resultsmentioning

confidence: 74%

Persea (avocados) Phylogenetic Analysis Based on Morphological Characters: Hypothesis of Species Relationships

Rojas

Terrazas

López–Mata

2006

Genet Resour Crop Evol

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“…They also found that the Mexican variety was closely related to P. floccosa Mez. Later, Davis et al (1998) also using RFLPs, found three mayor groups of cultivated avocado and additional clusters placed between these mayor groups, indicating a hybrid origin. In addition, Fielder et al (1998) using randomly amplified polymorphic DNA (RAPD) studied and confirmed three groups representing the three varieties of avocado.…”

Section: Diversitymentioning

confidence: 99%

Some aspects of avocado (Persea americana Mill.) diversity and domestication in Mesoamerica

Galindo-Tovar

Ogata-Aguilar

Arzate-Fernández

2007

Genet Resour Crop Evol

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Avocado (Persea americana Mill.) is a major tropical fruit, with origin in Mesoamerica area. Avocado is a very variable species and taxonomically poorly understood. It has been grown in the Neotropics since ancient times and it seems that the domestication of this tree in Mesoamerica started before other annual crops. In addition, it seems that much of avocado diversity as ecological differences, were originated as a result of cultural diversity. In view of this, avocado represents an interesting model to study domestication of tropical trees and develop forest management and germplasm conservation strategies. At present time, P. americana is worldwide distributed with Mexico as the main producer. However, there are some aspects on the origin, dispersion, and domestication of the species that remain to be answered. In this paper, we present a survey of these issues from the earliest to present time in Mesoamerica.Resumen El aguacate (Persea americana Mill.) es una importante fruta tropical, originaria del área de Mesoamérica. El aguacate es una especie altamente variable y su taxonomía aún no ha sido totalmente definida. El aguacate se ha desarrollado en el Neotrópico desde tiempos antiguos y es posible que su domesticación en Mesoamérica se iniciara antes que otras plantas anuales. También es probable que en gran medida su diversidad se originara además de las diferencias ecológicas, también como resultado de la diversidad cultural. Debido a esto, el aguacate representa un modelo interesante para estudiar procesos de domesticación en árboles tropicales y desarrollar estrategias de manejo en bosques y conservación del germoplasma. Actualmente, P. americana está distribuida en todo el mundo y México es el principal productor. Sin embargo, algunos aspectos del origen, dispersión y domesticación de la especie no han sido clarificados. En este artículo presentamos una investigación sobre estos aspectos, desde tiempos antiguos hasta el presente en el área de Mesoamérica.

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“…(31) Genetic markers and marker-assisted selection Molecular markers are increasingly being exploited in avocado breeding and genetic analysis. Isozymes were initially used as markers, (77) but recent research has focused on a diverse array of DNA markers, including restriction fragment length polymorphisms (RFLPs), (78)(79)(80)(81) variable numbers of tandem repeats (VNTRs), including minisatellites, (82) and simple sequence repeats (SSRs, or microsatellites). (83)(84)(85)(86)(87) A preliminary analysis of nucleotide sequence diversity in the wild progenitors of cultivated avocado suggests moderate levels of single nucleotide polymorphism (SNP) diversity (y w ¼ 0.0071, where y w is Watterson's diversity statistic (88) ), indicating that SNP discovery will be a valuable source of future markers.…”

Section: Gene Cloning and Estsmentioning

confidence: 99%

Persea americana (avocado): bringing ancient flowers to fruit in the genomics era

et al. 2008

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The avocado (Persea americana) is a major crop commodity worldwide. Moreover, avocado, a paleopolyploid, is an evolutionary "outpost" among flowering plants, representing a basal lineage (the magnoliid clade) near the origin of the flowering plants themselves. Following centuries of selective breeding, avocado germplasm has been characterized at the level of microsatellite and RFLP markers. Nonetheless, little is known beyond these general diversity estimates, and much work remains to be done to develop avocado as a major subtropical-zone crop. Among the goals of avocado improvement are to develop varieties with fruit that will "store" better on the tree, show uniform ripening and have better post-harvest storage. Avocado transcriptome sequencing, genome mapping and partial genomic sequencing will represent a major step toward the goal of sequencing the entire avocado genome, which is expected to aid in improving avocado varieties and production, as well as understanding the evolution of flowers from non-flowering seed plants (gymnosperms). Additionally, continued evolutionary and other comparative studies of flower and fruit development in different avocado strains can be accomplished at the gene expression level, including in comparison with avocado relatives, and these should provide important insights into the genetic regulation of fruit development in basal angiosperms.

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Genealogical relationships among cultivated avocado as revealed through RFLP analyses

Cited by 52 publications

References 8 publications

Persea (avocados) Phylogenetic Analysis Based on Morphological Characters: Hypothesis of Species Relationships

Persea (avocados) Phylogenetic Analysis Based on Morphological Characters: Hypothesis of Species Relationships

Some aspects of avocado (Persea americana Mill.) diversity and domestication in Mesoamerica

Persea americana (avocado): bringing ancient flowers to fruit in the genomics era

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