Resistance in Alfalfa to a Red Form of the Pea Aphid (Homoptera: Aphididae)1

Kugler, J. L.; Ratcliffe, R. H.

doi:10.1093/jee/76.1.74

Cited by 12 publications

(6 citation statements)

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“…Color polymorphism (red versus green) also characterizes pea aphid populations, and color variation influences susceptibility to parasitoids as well as predation rates (92). The two morphs also differ in their ability to utilize alfalfa hybrids selectively bred for aphid resistance (87), and behavioral differences exist in their response to disturbance (8). Taken together, these results suggest a complex relationship between color and fitness in this system (16).…”

Section: Axes Of Differentiationmentioning

confidence: 99%

Insect Speciation Rules: Unifying Concepts in Speciation Research

Mullen

Shaw

2014

Annu. Rev. Entomol.

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The study of speciation is concerned with understanding the connection between causes of divergent evolution and the origin and maintenance of barriers to gene exchange between incipient species. Although the field has historically focused either on examples of recent divergence and its causes or on the genetic basis of reproductive isolation between already divergent species, current efforts seek to unify these two approaches. Here we integrate these perspectives through a discussion of recent progress in several insect speciation model systems. We focus on the evolution of speciation phenotypes in each system (i.e., those phenotypes causally involved in reducing gene flow between incipient species), drawing an explicit connection between cause and effect (process and pattern). We emphasize emerging insights into the genomic architecture of speciation as well as timely areas for future research.

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Section: Axes Of Differentiationmentioning

confidence: 99%

Insect Speciation Rules: Unifying Concepts in Speciation Research

Mullen

Shaw

2014

Annu. Rev. Entomol.

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“…Moreover, color polymorphism in pea aphids may be under “bottom up” selective pressures from their host plants in addition to the “top-down” selective pressures from predators and parasitoids demonstrated in Losey et al (1997). Although Losey and Eubanks (2000) found no significant difference in the ability of pink and green morph collected from forage crops to survive on various vegetable host plants, Kugler and Ratcliffe (1983) found pink and green morphs differed in their ability to utilize alfalfa hybrids that had been bred for resistance to aphids. Also, significant differences in color morph frequency were found in French fields of Pisum sativum (pea), Medicago sativa (alfalfa), and Trifolium pratense (red clover).…”

Section: Introductionmentioning

confidence: 99%

Genetics of Color Polymorphism in the Pea Aphid,Acyrthosiphon pisum

Caillaud¹,

Losey²

2010

Journal of Insect Science

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The genetic basis of color polymorphism is explored in the pea aphid, Acyrthosiphon pisum (Harris) (Homoptera: Sternorrhyncha), in which two color morphs have been described (pink or green). Laboratory crosses and a Mendelian genetic analysis reveal that color polymorphism in pea aphids is determined by a single biallelic locus, which we name colorama, with alleles P and p, pink being dominant to green. The putative genotypes are Pp or PP for pink morphs, and pp for green morphs. This locus is shown to be autosomal. Last, there was no evidence of influence of the direction of the cross on color inheritance, thus showing that cytoplasmic effects and/or maternally-inherited symbionts play no role in the inheritance of color polymorphism in pea aphids. The existence of a simple genetic determinism for color polymorphism in a system in which genetic investigation is possible may facilitate investigations on the physiological and molecular mechanisms of genetically-based color morph variation, and the establishment of a link between this locus and fitness in a range of ecological conditions.

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“…Collection sites in each Þeld were separated by at least 10 m to ensure that each site contained distinct aphid clones. Because there are demonstrated differences in their biology (Kugler andRatcliffe 1983, Losey et al 1997), both red and green morph aphids were collected at each collection site so that their host range could be compared. To eliminate the possibility of mortality or behavioral effects caused by parasitism, all survival assays were run on the offspring (F 1 ) of Þeld-collected aphids.…”

Section: Survival Of Aphids Collected From Alfalfa and Clover On Foramentioning

confidence: 99%