Genetic differences among purslane sawfly biotypes

Gorske, S. F.; Sell, D. K.

doi:10.1093/oxfordjournals.jhered.a108730

Cited by 10 publications

(6 citation statements)

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“…To understand microevolutionary processes that lead to adaptively mediated divergence, studies of intraspecific differentiation, such as those described above, are required. Often, however, the taxa initially considered to be conspecific are determined to be sympatric host-associated sibling species (Huettel and Bush, 1972;Gorske and Sell, 1976;Krysan et al, 1983;Wood and Guttman, 1983) and host-plant specialization is evident. The primary question then is not whether adaptation has occurred but, instead, what types of adaptations (behavioral or physiological) maintain host specificity.…”

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confidence: 99%

Quantitative Genetics, Development and Physiological Adaptation in Host Strains of Fall Armyworm

Pashley¹

1988

Evolution

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Two genetically differentiated host strains of fall armyworm were reared on their own and each other's host plants, rice and corn, to determine whether they were physiologically adapted to their natural hosts and whether they exhibited genetically based differences in development. Larval host had a greater impact on development in the rice strain than in the corn strain, indicating that physiology could have facilitated specialization in one strain but not the other. Consequently, behavioral mechanisms are also likely to be important in the maintenance of host specificity. Comparisons between strains indicated significant differences in one trait, the rate at which larvae gained weight. Because this character had consistently high heritabilities, genetic differentiation in development is indicated. An analysis of genotype-by-environment interactions within each strain detected significant interactions for three of five traits, suggesting that genotypic performance on one host was not indicative of performance on the other. Each strain thus exhibited genetic variation that would facilitate host-associated divergence and adaptation if coupled with a mechanism that reduced gene flow between hosts. Finally, significant genetic correlations between several characters were detected when strains were reared on their natural hosts but not when they were reared on nonnatural hosts. Apparently, feeding on novel hosts caused developmental uncoupling of characters. Release from genetic constraints could provide a mechanism for physiological adjustments to newly occupied habitats.

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confidence: 99%

Quantitative Genetics, Development and Physiological Adaptation in Host Strains of Fall Armyworm

Pashley¹

1988

Evolution

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“…Often, however, the taxa initially considered to be conspecific are determined to be sympatric host-associated sibling species (Huettel and Bush, 1972;Gorske and Sell, 1976;Krysan et al, 1983;Wood and Guttman, 1983) and host-plant specialization is evident. The primary question then is not whether adaptation has occurred but, instead, what types of adaptations (behavioral or physiological) maintain host specificity.…”

mentioning

confidence: 99%

Quantitative Genetics, Development, and Physiological Adaptation in Host Strains of Fall Armyworm

Pashley

1988

Evolution

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Abstract. -Two genetically differentiated host strains of fall armyworm were reared on their own and each other's host plants, rice and corn, to determine whether they were physiologically adapted to their natural hosts and whether they exhibited genetically based differences in development. Larval host had a greater impact on development in the rice strain than in the corn strain, indicating that physiology could have facilitated specialization in one strain but not the other. Consequently, behavioral mechanisms are also likely to be important in the maintenance of host specificity. Comparisons between strains indicated significant differences in one trait, the rate at which larvae gained weight. Because this character had consistently high heritabilities, genetic differentiation in development is indicated.An analysis of genotype-by-environment interactions within each strain detected significant interactions for three of five traits, suggesting that genotypic performance on one host was not indicative of performance on the other. Each strain thus exhibited genetic variation that would facilitate host-associated divergence and adaptation if coupled with a mechanism that reduced gene flow between hosts. Finally, significant genetic correlations between several characters were detected when strains were reared on their natural hosts but not when they were reared on nonnatural hosts. Apparently, feeding on novel hosts caused developmental uncoupling of characters. Release from genetic constraints could provide a mechanism for physiological adjustments to newly occupied habitats.

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“…Enzymes stained were: aconitase (ACON), a-glycerophosphate dehydrogenase (a-GPDH), arginine kinase (ARGK), esterase (EST), fumarase (FUM), glutamic-oxaloacetic transaminase (GOT), hexokinase (HEX), j3-hydroxybutyrate dehydrogenase (HBDH), isocitrate dehydrogenase (lDH), leucine aminopeptidase (LAP), malate dehydrogenase (MDH), malic enzyme (ME), mannose-6-phosphate isomerase (MPI), phosphoglucose isomerase (PGI), phosphoglucomutase (PGM), sorbitol dehydrogenase (SDH), and triose-phosphate isomerase (TPI). Gorske and Sell (1976) reported two "feeding types" of S. pilicornis in purslane, an internal leaf-miner and an external leaf-feeder. These types could be separated in the Riverside population by morphological and fixed electrophoretic differences (Sheppard and Heydon, unpubl.).…”

Section: Methodsmentioning

confidence: 99%

High Levels of Genetic Variability in Three Male‐haploid Species (Hymenoptera: Argidae, Tenthredinidae)

Sheppard

Heydon²

1986

Evolution

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Genetic differences among purslane sawfly biotypes

Cited by 10 publications

References 0 publications

Quantitative Genetics, Development and Physiological Adaptation in Host Strains of Fall Armyworm

Quantitative Genetics, Development and Physiological Adaptation in Host Strains of Fall Armyworm

Quantitative Genetics, Development, and Physiological Adaptation in Host Strains of Fall Armyworm

High Levels of Genetic Variability in Three Male‐haploid Species (Hymenoptera: Argidae, Tenthredinidae)

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