Pecans and Other Hickories (Carya)

Thompson, Tommy E.; Grauke, L.J.

doi:10.17660/actahortic.1991.290.19

Cited by 49 publications

(36 citation statements)

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“…, 1965). A detailed phylogenetic hypothesis does not exist for the genus Carya but within the genus, C. aquatica and C. illinoinensis have been grouped together in the section Apocarya along with three other species of North American hickories and five other species of Asian hickories (Thompson & Grauke, 1991). Grauke et al.…”

Section: Methodsmentioning

confidence: 99%

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Testing host‐associated differentiation in a quasi‐endophage and a parthenogen on native trees

Dickey

Medina

2010

J of Evolutionary Biology

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Host‐associated differentiation (HAD) is the formation of genetically divergent host‐associated sub‐populations. Evidence of HAD has been reported for multiple insect herbivores to date, but published studies testing more than one herbivore for any given host‐plant species pair is limited to herbivores on goldenrods. This limits the number of pair‐wise comparisons that can be made about insect life‐history traits that might facilitate or inhibit host‐race development in general. Two traits previously proposed to facilitate HAD include endophagy and parthenogenesis. We tested for HAD in two herbivores, a quasi‐endophagous caterpillar and a parthenogenetic aphid, feeding on two closely related species of hickories. We found that the quasi‐endophage is panmictic, whereas the parthenogen exhibits HAD on their sympatric host plants, pecan and water hickory, at a geographic mesoscale. This is an important first step in the characterization of HAD in multiple insect herbivores using North American hickories, a host‐plant system with many shared parthenogens.

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Section: Methodsmentioning

confidence: 99%

“…, 1987) but hybrids can be recognized by nut and bud phenotypes intermediate to parent species (Grauke et al. , 1987; Thompson & Grauke, 1991). The genus Carya is very promiscuous, and other hybrids including either pecan or water hickory have been documented (Thompson & Grauke, 1991).…”

Section: Methodsmentioning

confidence: 99%

Testing host‐associated differentiation in a quasi‐endophage and a parthenogen on native trees

Dickey

Medina

2010

J of Evolutionary Biology

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“…Native pecan populations occupy the westernmost range of any Carya species (Thompson and Grauke 1991) and occur in regenerating stands from Iowa south to the Gulf Coast of Louisiana, Texas, and into Mexico (Fig. 1).…”

Section: Communicated By a Dandekarmentioning

confidence: 99%

Geographic patterns of genetic variation in native pecans

Grauke¹,

Mendoza-Herrera

Miller

et al. 2011

Tree Genetics & Genomes

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A structured collection of 80 seedling pecan trees [Carya illinoinensis (Wangenh.) K. Koch], representing 19 putatively native pecan populations across the species range, was evaluated at three plastid and 14 nuclear microsatellite (simple sequence repeat, SSR) loci. Data were analyzed using a priori population designations and also within a Bayesian framework, in which individuals were assigned to clusters regardless of population of origin. Population genetic analyses using a priori populations, clusters based on chloroplast microsatellite data (cpSSR), and clusters based on nuclear microsatellite data (nSSR) yielded consistent results. For all groupings, cpSSR variation exhibited more geographic structure than the nSSR data.Furthermore, cpSSR microsatellite diversity decreased with increasing latitude, but this pattern was not observed with the nuclear data. Contrasting patterns in plastid and nuclear genetic diversity demonstrate unique aspects of postglacial recolonization reflected in the movement of seeds versus pollen. These data suggest that plastid SSRs are useful tools for identifying population structure in pecan and hold promise for ongoing efforts to identify and conserve representative germplasm in ex situ collections.

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“…These trees are thought to be closely related (Thompson & Grauke, 1991) and are sympatric in East Texas where phylloxerae were collected for this study. These trees are thought to be closely related (Thompson & Grauke, 1991) and are sympatric in East Texas where phylloxerae were collected for this study.…”

Section: Introductionmentioning

confidence: 99%

Host‐associated genetic differentiation in pecan leaf phylloxera

Dickey¹,

Medina²

2012

Entomologia Exp Applicata

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Host-associated differentiation (HAD) is the formation of genetically distinct host-associated populations. One of the genotypic signatures of HAD is that populations exhibit stronger differentiation by host-plant species than by geographic isolation. HAD, as a mechanism promoting ecological speciation, has been invoked to explain phytophagous insect diversity. Two traits proposed to promote HAD are endophagy and parthenogenesis. Using amplified fragment length polymorphisms (AFLPs), we tested for the presence of HAD in pecan leaf phylloxera, Phylloxera notabilis Pergande (Hemiptera: Phylloxeridae), an endophagous, gall inducing, and cyclically parthenogenetic insect on sympatric pecan and water hickory at a geographic mesoscale. This species shows strong HAD. Whereas the effect of collecting site was significant, accounting for 7.3% of molecular variation, hostplant species identity accounted for 63.5%. In addition, a choice test indicated that pecan leaf phylloxera originating from water hickory showed weak but significant preference for leaflets of the natal host, whereas pecan leaf phylloxera originating from pecan did not. This is the first such study of a species of arboreal Phylloxeridae, a poorly known insect group. This is also the first endophage and the second parthenogen shared by these two hickory species to show evidence of HAD. This hickory system could be a good parthenogen-rich counterpoint to the goldenrod system in the study of HAD in insect communities.

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Pecans and Other Hickories (Carya)

Cited by 49 publications

References 0 publications

Testing host‐associated differentiation in a quasi‐endophage and a parthenogen on native trees

Testing host‐associated differentiation in a quasi‐endophage and a parthenogen on native trees

Geographic patterns of genetic variation in native pecans

Host‐associated genetic differentiation in pecan leaf phylloxera

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