אסיף מאגר המחקר החקלאי

The neutral sterols of Megalotomus quinquespinosus (say) (hemiptera: Alydidae) and identification of makisterone a as the major free ecdysteroid

Year:

1986

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Volume :

3

Co-Authors:

Feldlaufer, M.F., Insect and Nematode Hormone Laboratory, USDA, Agricultural Research Service, Beltsville, Maryland, United States
Svoboda, J.A., Insect and Nematode Hormone Laboratory, USDA, Agricultural Research Service, Beltsville, Maryland, United States
Aldrich, J.R., Insect and Nematode Hormone Laboratory, USDA, Agricultural Research Service, Beltsville, Maryland, United States
Lusby, W.R., Insect and Nematode Hormone Laboratory, USDA, Agricultural Research Service, Beltsville, Maryland, United States

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Abstract:

Last‐stage nymphs of the broad‐headed bug, Megalotomus quinquespinosus contain the C28 ecdysteroid makisterone A as their major ecdysteroid. No ecdysone or 20‐hydroxyecdysone was detected in whole body extracts analyzed by high performance liquid chromatography and radioimmune assay. Analyses of the neutral sterols of this phytophagous hemipteran revealed that the sterol composition of the nymphs was highly reflective of their dietary sterols. The most abundant nymphal sterols were sitosterol (46.6%), Δ7‐stigmastenol (13.8%) and spinasterol (13.4%). Cholesterol accounted for only 0.2% of the total sterols and indicates that this species is incapable of converting 24‐alkyl sterols to cholesterol. Copyright © 1986 Wiley‐Liss, Inc.

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