Neurosecretory cell and corpus allatum activity during production of successive egg batches in virgin Melanoplus sanguinipes (Fab.)

Gillott, Cedric; Dogra, G. S.

doi:10.1016/0016-6480(72)90089-5

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…When these changes were interpreted in terms of net storage or secretion of hormone (see Gillott and Dogra 1972), it was concluded that the great increase in CA volume occurring before the molt from larva to supplementary reproductive was indicative of net storage of JH, not enhanced secretion of a different (gonadotropic) hormone as had been suggested earlier by Liischer. In the differentiation of a presoldier the CA volume remains constant yet the synthetic Can.…”

Section: Introductionmentioning

confidence: 80%

“…There are several reports that the secretory activity of the CA is not related to the size of the glands in non-social insects (Mordue 1967;Lea and Thomsen 1969;Gillott and Dogra 1972;Johnson and Hill 1973). In contrast, several authors have concluded that enlargement of the CA is indicative of hormone storage (and, by implication, a decline in the rate of secretion) (see, for example, Highnam and Haskell 1964;Engelmann 1970;Adams 1970).…”

Section: Efect Of Roller's Jh or Fme Injectionmentioning

confidence: 99%

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Endocrine control of caste differentiation in Zootermopsis angusticollis Hagen (Isoptera)

Yin¹,

Gillott²

1975

Can. J. Zool.

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The effect of injection of Röller's juvenile hormone (JH) or farnesyl methyl ether (FME) on differentiation of supplementary reproductives and presoldiers of Zootermopsis angusticollis has been studied. Early in the stadium (that is, during the competence period) Röller's JH and FME inhibit differentiation. When injected after the competence period the substances do not alter the rate of supplementary reproductive differentiation in orphaned colonies but enhance presoldier differentiation in soldierless colonies provided that there is a sufficient number of supplementary reproductives present.A modified version of Lüscher's (1960) hypothesis for the endocrine control of caste differentiation is proposed. It is suggested that all the developmental possibilities that exist in the termite colony can be explained on the basis of a single corpus allatum hormone produced in different quantities and at different times within the stadium.

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Section: Introductionmentioning

confidence: 80%

Section: Efect Of Roller's Jh or Fme Injectionmentioning

confidence: 99%

Endocrine control of caste differentiation in Zootermopsis angusticollis Hagen (Isoptera)

Yin¹,

Gillott²

1975

Can. J. Zool.

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“…Co.) was administered to newly ecdysed 2nd-instar nymphs in several ways. In preliminary tests, the nymphs were reared continuously on an alfalfa-bran mixture (Gillott and Dogra 1972) and lettuce which had been treated with 0, 0.01, 0.1, 1.0, 10, or 100 ppm diflubenzuron. The WP formulation was incorporated directly into the artificial diet prior to each test whereas lettuce was dipped daily in a comparable concentration of a freshly-prepared diflubenzuron solution.…”

Section: Methodsmentioning

confidence: 99%

TOXICITY OF DIFLUBENZURON TO NYMPHS OF THE MIGRATORY GRASSHOPPER, MELANOPLUS SANGUINIPES (ORTHOPTERA: ACRIDIDAE)

Elliott

Iyer

1982

Can Entomol

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Laboratory tests showed that nymphs of the migratory grasshopper are very sensitive to diflubenzuron (Dimilin) when reared continuously on treated wheat seedlings or artificial diet and fresh lettuce. At concentrations of 10 ppm or above, diflubenzuron completely inhibited moulting of 2nd-instar nymphs. With continuous exposure on treated wheat seedlings, the LC90 values after 8, 12 and 20 days were 10.0, 2.4 and 0.8 ppm, respectively. Comparable values were obtained with the artificial diet and lettuce. However, when 2nd instars were placed on diflubenzuron-treated wheat foliage for 1 day then transferred onto untreated plants, toxicity declined markedly.Although the toxic effects of diflubenzuron were delayed, dry weight determinations on wheat seedlings indicated that nymphal feeding damage was insignificant if the plants had been sprayed with 10 ppm diflubenzuron.The implications of these findings are discussed in terms of the potential field use of diflubenzuron against stationary and mobile grasshopper nymphs.

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A comparison of aldehyde fuchsin and alcian blue staining of neurosecretory material in Oncopeltus fasciatus

Mahon

Nair

1975

Cell Tissue Res.

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The dynamics of the "A" cells of the parsintercerebralis of Oncopeltus fasciatus over the first eight days of adult life was studied by microspectrophotometry of sections stained either with aldehyde fuchsin or alcian blue 8 GX. The data show that the two stains differ in their selectivity as they record different events in the history of the cells. A hypothesis is proposed that the aldehyde fuchsin is more sensitive to the presence of a "carrier" protein in the cell, whereas alcian blue 8 GX is more sensitive to the presence of the "active principle" in the cell.

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Neurosecretory cell and corpus allatum activity during production of successive egg batches in virgin Melanoplus sanguinipes (Fab.)

Cited by 11 publications

References 22 publications

Endocrine control of caste differentiation in Zootermopsis angusticollis Hagen (Isoptera)

Endocrine control of caste differentiation in Zootermopsis angusticollis Hagen (Isoptera)

TOXICITY OF DIFLUBENZURON TO NYMPHS OF THE MIGRATORY GRASSHOPPER, MELANOPLUS SANGUINIPES (ORTHOPTERA: ACRIDIDAE)

A comparison of aldehyde fuchsin and alcian blue staining of neurosecretory material in Oncopeltus fasciatus

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