The response of a homochrome grasshopper, Oedipoda miniata, to the dark-colour-inducing neurohormone (DCIN) of locusts

Yerushalmi, Yoram; Pener, M. P.

doi:10.1016/s0022-1910(00)00156-6

Cited by 22 publications

(15 citation statements)

References 8 publications

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“…These colour grades are similar to those employed and illustrated previously for nymphs (see colour plate as Fig. 1 in Yerushalmi & Pener, 2001); therefore, they are not illustrated here. Half grades were also used.…”

Section: Methodssupporting

confidence: 74%

“…In the present study, it was investigated whether adults of O. miniata respond to the darkening effect of the DCIN and whether there are differences in the response of young (pre‐diapause) and old (a few weeks before natural termination of the reproductive diapause) adults. The response of the adults in comparison to that of conspecific nymphs reported previously (Yerushalmi & Pener, 2001) is also discussed.…”

Section: Introductionmentioning

confidence: 74%

“…Graded doses of DCIN were injected as described (Yerushalmi & Pener, 2001), except that the desired dose was always injected in 2 µL of olive oil per recipient. Because of a shortage of the grasshoppers, only oil‐injected (2 µL) controls were employed.…”

Section: Methodsmentioning

confidence: 99%

“…In a previous study on the effect of DCIN on O. miniata nymphs (Yerushalmi & Pener, 2001), the results were presented in median colour grades. From the statistical standpoint, medians are preferable to means, because the colour grades are chosen arbitrarily and their distribution is neither continuous, nor necessarily normal.…”

Section: Methodsmentioning

confidence: 99%

“…The primary structure of this neurohormone was elucidated (Tawfik et al ., 1999) and proved identical to [His 7 ]‐corazonin, previously isolated by Veenstra (1991) from the corpora cardiaca of the acridid, Schistocerca americana , but without known physiological function. DCIN induces dark coloration in nymphs of O. miniata (Yerushalmi & Pener, 2001), as well as in other acridid nymphs (Tanaka, 2000a) and presumably plays a major role in the control of homochromy in acridids.…”

Section: Introductionmentioning

confidence: 99%

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Age‐dependent response of adults of a homochrome grasshopper, Oedipoda miniata, to the dark‐colour‐inducing neurohormone (DCIN) of locusts

Yerushalmi

Pener

2002

Physiological Entomology

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Abstract. The effect of the dark-colour-inducing neurohormone (DCIN [His 7 ]-corazonin) of locusts was investigated in field-collected young and old adults of the grasshopper, Oedipoda miniata (Pallas) (Orthoptera: Acrididae). This species shows homochromy, but neither green-brown, nor phase-dependent colour polymorphism. By injecting graded doses of synthetic DCIN in 2 mL of olive oil, young adults were tested within a week of their last moult, and old adults 3.5 months later, a few weeks before natural termination of their reproductive summer diapause. Colour changes were followed for 28 days after injection. Darkening of the young adults was considerable, but their response to DCIN is more moderate than that of conspecific nymphs, by exhibiting a higher threshold, slower response and weaker maximal response. Old adults also show a clear effect, but their response is even slower and less marked than the response of the young adults. It is concluded that the response to DCIN decreases from nymphs to young adults and it is further decreasing with ageing of the adults.

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Section: Methodssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 74%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%