1958
DOI: 10.1139/z58-028
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Pectinase in Certain Insects

Abstract: Pectinase was found in the saliva of 23 species of aphids, one species of leafhopper, and one species of adelgid. The enzyme was not found in four species of aphids in their apterous form, and one species of psyllid, or in the saliva of the alate form of five species of aphids that contained pectinase in the apterous form. These results emphasize the need to consider each form of a species of aphid individually. The discussion considers similarities in the mode of tissue penetration by fungi and insects, and b… Show more

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Cited by 57 publications
(18 citation statements)
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“…In our studies we examined apterous (wingless) and alate (winged) forms, on the hypothesis that these forms might differ physiologically as well as morphologically. We found that they often differed in enzymic content (2), which raised the question of the function of pectinase in plant penetration by aphids. In the present paper we show the association that exists between the type of penetration of plant tissues by aphids and the occurrence of pectinase in their saliva.…”
Section: Introductionmentioning
confidence: 91%
See 1 more Smart Citation
“…In our studies we examined apterous (wingless) and alate (winged) forms, on the hypothesis that these forms might differ physiologically as well as morphologically. We found that they often differed in enzymic content (2), which raised the question of the function of pectinase in plant penetration by aphids. In the present paper we show the association that exists between the type of penetration of plant tissues by aphids and the occurrence of pectinase in their saliva.…”
Section: Introductionmentioning
confidence: 91%
“…Since then we demonstrated the Dresence of ~ectinase in the saliva of some aphids (1,2,7). In our studies we examined apterous (wingless) and alate (winged) forms, on the hypothesis that these forms might differ physiologically as well as morphologically.…”
Section: Introductionmentioning
confidence: 99%
“…However a newer biotype, GBE, which showed normal feeding on 1'3809, was able to more rapidly depolymerize pectin from IS809 in part by possessing a significantly more active pectin methylesterase than GBC. Aphids possess pectinases in their saliva purportedly to facilitate the intercellular penetration by their stylets [6]. Inhibition of these enzymes by factors in the plant might impede stylet penetration and render the plant more resistant.…”
Section: Introductionmentioning
confidence: 99%
“…While again presence of an enzyme in whole body homogenates does not necessarily imply its presence in saliva, pectin is an insoluble polysaccharide found primarily in plants, not animals; therefore, it seems likely that if whiteflies produce a pectinase, it would have to be injected into the plant via the saliva in order to have an effect. Furthermore, pectinases have been detected in the saliva of many, although not all, aphid species that have been examined (Adams and McAllan 1958;McAllan and Adams 1961;Campbell and Dreyer 1985;Miles 1999;Cherqui and Tjallingii 2000). Pectinases have been hypothesized to aid stylet penetration through the pectin-rich middle lamella that serves as the intercellular cement between adjacent cell walls in plant tissue (McAllan and Adams 1961;Campbell and Dreyer 1985), although this hypothesis has been challenged (Tjallingii and Hogen Esch 1993).…”
Section: Salivary Componentsmentioning
confidence: 99%