| Canalization of development and ecdysteroid timing during the last instar in lubber grasshoppers. | |
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MedLine Citation:
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PMID: 12770018 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Development in many phytophagous, holometabolous insects is flexible at the beginning but inflexible at the end of the last larval instar. A prominent feature of the inflexible period is a peak in hemolymph levels of ecdysteroids. We tested whether this pattern holds true for the final molt of a phytophagous, hemimetabolous insect, Romalea microptera (the Eastern lubber grasshopper). We fed one group of grasshoppers a high quantity diet (H) throughout the 5th (final) instar and a second group a low quantity diet (L) throughout the instar. Three other diet treatments involved starting the instar on the high diet and then abruptly switching to the low diet at 3, 8, or 13 days (H3L, H8L, and H13L respectively) and continuing the low diet until adult molt. Diet treatment did not affect the maximum hemolymph level of ecdysteroids (E(max)); this peak typically reached ~4000 ng/ml. Ecdysteroid levels were elevated for ~4 days in all groups. In contrast, diet significantly affected age at adult molt and age at E(max) such that H = H13L = H8L < H3L = L. We identified estimates of thresholds for weight gain (20% initial weight) and hemolymph ecdysteroids (100 ng/ml), after which diet did not affect the time to the adult molt. The weight gain threshold was less precise than the ecdysteroid threshold. These results suggest that R. microptera has an extended period of inflexible (canalized) development during the final instar that includes a peak of ecdysteroids. We hypothesize this pattern holds for many phytophagous, hemimetabolous insects. |
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Authors:
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J D Hatle; W A Miller; D W Borst |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Journal of insect physiology Volume: 49 ISSN: 0022-1910 ISO Abbreviation: J. Insect Physiol. Publication Date: 2003 Jan |
Date Detail:
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Created Date: 2003-05-28 Completed Date: 2003-07-07 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 2985080R Medline TA: J Insect Physiol Country: England |
Other Details:
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Languages: eng Pagination: 73-80 Citation Subset: IM |
Affiliation:
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Department of Biological Sciences, Illinois State University, Normal, IL 61790-4120, USA. jhatle@ilstu.edu |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Diet Ecdysteroids / physiology* Feeding Behavior Grasshoppers / growth & development* Larva Male Molting Time Factors |
| Chemical | |
Reg. No./Substance:
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0/Ecdysteroids |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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