Histological Studies of the Digestive System of the Squash Bug, Anasa Tristis De G. (Hemiptera, Coreidae)1

Breakey, E. P.

doi:10.1093/aesa/29.4.561

Cited by 10 publications

(5 citation statements)

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“…Long‐term feeding on the fruit leads to fruit collapse, while leaf feeding induces isolated necrotic lesions (Neal, 1993). Early experiments revealed the presence of starch granules in the gut of A. tristis , which are only found in the cytoplasm of plants, suggesting that the squash bugs ingest the intracellular contents of plant cells (Breakey, 1936); however, experiments in which squash bugs were allowed to feed on plants having safranin‐stained xylem fluid showed that red dye accumulated in the gut of the insects, suggesting that xylem is also a food source for the insects (Neal, 1993). Surprisingly, squash bug feeding damage extends beyond the xylem vessels and into the phloem.…”

Section: Insects As Vectors For Phytopathogenic Bacteriamentioning

confidence: 99%

Insects as alternative hosts for phytopathogenic bacteria

2011

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Phytopathogens have evolved specialized pathogenicity determinants that enable them to colonize their specific plant hosts and cause disease, but their intimate associations with plants also predispose them to frequent encounters with herbivorous insects, providing these phytopathogens with ample opportunity to colonize and eventually evolve alternative associations with insects. Decades of research have revealed that these associations have resulted in the formation of bacterial-vector relationships, in which the insect mediates dissemination of the plant pathogen. Emerging research, however, has highlighted the ability of plant pathogenic bacteria to use insects as alternative hosts, exploiting them as they would their primary plant host. The identification of specific bacterial genetic determinants that mediate the interaction between bacterium and insect suggests that these interactions are not incidental, but have likely arisen following the repeated association of microorganisms with particular insects over evolutionary time. This review will address the biology and ecology of phytopathogenic bacteria that interact with insects, including the traditional role of insects as vectors, as well as the newly emerging paradigm of insects serving as alternative primary hosts. Also discussed is one case where an insect serves as both host and vector, which may represent a transitionary stage in the evolution of insect-phytopathogen associations.

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Section: Insects As Vectors For Phytopathogenic Bacteriamentioning

confidence: 99%

Insects as alternative hosts for phytopathogenic bacteria

2011

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“…This is the development, on the section of the mid-gut immediately anterior to the ileum, of numerous tubular or pouch-like diverticula, the gastric caeca. Altogether, the pattern of the alimentary canal is as follows (Whitfield, 1929;Breakey, 1936;Harris, 1938;Yanai, 1952;Bocharova-Messner, 1961). A large anterior expansion, lined with typical bulbous mid-gut cells, is followed by a tubular intestine lined with columnar cells having a narrow brush-like border.…”

Section: The Pentatomomorphamentioning

confidence: 99%

Evolution of the Alimentary Canal in the Hemiptera

1966

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“…The guts of the cucurbit-feeding coreids Leproglossus membranaceus F. (Goodchild, unpubl. ) and Anasa trisris De G. (Breakey, 1936) are continuous; but the morphology of the gut of Megymenum spp. (Dinidorinae), cucurbit-feeders of S. E. Asia and Australia, has not yet been described.…”

Section: Discussionmentioning

confidence: 99%

THE NATURE AND ORIGIN OF THE MID‐GUT CONTENTS IN A SAP‐SUCKING HETEROPTERAN, PIEZOSTERNUM CALIDUM FAB.(TESSARATOMINAE), AND THE ROLE OF SYMBIOTIC BACTERIA IN ITS NUTRITION

Goodchild

1978

Entomologia Exp Applicata

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Evidence is presented in support of the hypothesis that in Piezosternum calidum the mid‐gut contents consist of symbiotic bacteria from the gastric caeca, and are not derived from the plant sap ingested. A similar process has been observed in other large sap‐sucking Heteroptera, of which Mygdonia tuberculosa (Coreidae) has been studied as an example, the site of bacterial digestion is usually posterior to an interruption in the continuity of the mid‐gut, but in P. calidum the gut is continuous and the contents fill it completely. It is suggested that the mid‐gut contents of some other sap‐sucking Heteroptera with continuous guts may also prove to be derived from their bacterial symbionts. RÉSUMÉ LA NATURE ET L'ORIGINE DU CONTENU DE L'INTESTIN MOYEN CHEZ UN HÉTÉROPTÈRE SUCEUR DE SÈVE. PIEZOSTERNUM CALIDUM (TESSARATOMINAE) ET LE RǑLE DES BACTÉRIES SYMBIOTIQUES DANS SA NUTRITION Les Hétéroptères suceurs de sève possèdent sur le mesenteron postérieur de nombreux coecums remplis de bactéries symbiotiques. Chez beaucoup d'espèces, par exemple Mygdonia tuberculosa (Coreidae) le mesenteron est interrompu dans sa région moyenne et la partie postérieure renferme un contenu digestif qui représente les bactéries coecales digérées. La partie antérieure contient peu de matière solide provenant de la sève de la plante‐hǒte. Chez Piezosternum calidum, suceur de sève sur des cucurbitacées; l'intestin moyen n'est pas interrompu et est complètement rempli par un matériel presque solide. Ce contenu digestif est uniforme d'aspect sur coupes histologiques et sa composition riche en acides aminés, le rapproche davantage des bactéries coecales que de la sève de la plante‐hǒte. Le mesenteron présente d'ailleurs une région très acide où les bactéries pourraient ětre digérées. Ces bactéries se cultivent sur un milieu à base d'acide urique, de nitrate ou d'ammoniaque, en ce qui concerne la source d'azote. L'utilisation massive des bactéries symbiotiques par l'insecte lui est peut‐ětre nécessaire car la source d'azote dans la plante n'est pas directement assimilable. La continuité de la lumière intestinale est peut‐ětre liée à l'absence dans la sève de la plante d'une substance qui serait nuisible aux bactéries.

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Histological Studies of the Digestive System of the Squash Bug, Anasa Tristis De G. (Hemiptera, Coreidae)1

Cited by 10 publications

References 0 publications

Insects as alternative hosts for phytopathogenic bacteria

Insects as alternative hosts for phytopathogenic bacteria

Evolution of the Alimentary Canal in the Hemiptera

THE NATURE AND ORIGIN OF THE MID‐GUT CONTENTS IN A SAP‐SUCKING HETEROPTERAN, PIEZOSTERNUM CALIDUM FAB.(TESSARATOMINAE), AND THE ROLE OF SYMBIOTIC BACTERIA IN ITS NUTRITION

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