The ultrastructure of o�sorption in Locusta migratoria migratorioides

Davies, P.L.; King, P. E.

doi:10.1007/bf00315130

Cited by 7 publications

(4 citation statements)

References 22 publications

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“…All these changes may be interpreted as adaptations which assist the passage of the products of degradation from the oocyte, partly through and partly between the follicle cells, across the wall of the ovariole and into the haemolymph. Similar changes have been recorded during the late stages of oosorption in L. migratoriu (Davies and King 1972) and in N. vitripennis (King and Richards 1968).…”

Section: Stage Zvsupporting

confidence: 82%

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Oösorption in the Coleopteran Sitophilus granorius (L.)

King¹,

Al‐Khalifa²

1980

Acta Zoologica

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King, P. E., Al‐Khalifa, M. S. 1980. Oösorption in the coleopteran Sitophilus granarius (L.). (Department of Zoology, University College, Swansea, U.K.) — Acta zool. (Stockh.) 61(2): 79–86. The process of oösorption in the terminal oöcytes of starved specimens of Sitophilus granarius is described Starvation affects the nucleus, mitochondria and endoplasmic reticulum in both the follicle cells and the oöcyte. Glycogen disappears from the oöcyte at an early stage and islands are formed in the oö:cyte by infoldings of the combined follicle, oöcyte cell membranes.

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Section: Stage Zvsupporting

confidence: 82%

“…The next material broken down and removed is protein, though lipoid is present until a later stage. This has been recorded during oosorption in other insects (Lusis 1963, Davies and King 1972and De Loofe and Lagasse 1970.…”

Section: Discussionmentioning

confidence: 60%

Oösorption in the Coleopteran Sitophilus granorius (L.)

King¹,

Al‐Khalifa²

1980

Acta Zoologica

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“…We found that the ovariole number showed no significant differences at 0, 2, 4, 6, 8, 10 and 12 days post adult eclosion (PAE0, 2,4,6,8,10,12) between gregarious and solitarious locusts ( Fig 1A and 1B). Then, we discriminated the oosorption into five stages in the locusts ( Fig 1A) based on specific criteria [24,25]. Compared to solitarious oocytes, gregarious ones showed significantly higher oosorption ratios of 21%, 31%, 24% and 21% from PAE6, 8, 10 and 12, respectively, during oocyte maturation ( Fig 1C).…”

Section: The Oosorption Ratio Is Different In Gregarious and Solitarimentioning

confidence: 99%

Phase-related differences in egg production of the migratory locust regulated by differential oosorption through microRNA-34 targeting activinβ

et al. 2021

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Outbreaks of locust plagues result from the long-term accumulation of high-density egg production. The migratory locust, Locusta migratoria, displays dramatic differences in the egg-laid number with dependence on population density, while solitarious locusts lay more eggs compared to gregarious ones. However, the regulatory mechanism for the egg-laid number difference is unclear. Herein, we confirm that oosorption plays a crucial role in the regulation of egg number through the comparison of physiological and molecular biological profiles in gregarious and solitarious locusts. We find that gregarious oocytes display a 15% higher oosorption ratio than solitarious ones. Activinβ (Actβ) is the most highly upregulated gene in the gregarious terminal oocyte (GTO) compared to solitarious terminal oocyte (STO). Meanwhile, Actβ increases sharply from the normal oocyte (N) to resorption body 1 (RB1) stage during oosorption. The knockdown of Actβ significantly reduces the oosorption ratio by 13% in gregarious locusts, resulting in an increase in the egg-laid number. Based on bioinformatic prediction and experimental verification, microRNA-34 with three isoforms can target Actβ. The microRNAs display higher expression levels in STO than those in GTO and contrasting expression patterns of Actβ from the N to RB1 transition. Overexpression of each miR-34 isoform leads to decreased Actβ levels and significantly reduces the oosorption ratio in gregarious locusts. In contrast, inhibition of the miR-34 isoforms results in increased Actβ levels and eventually elevates the oosorption ratio of solitarious locusts. Our study reports an undescribed mechanism of oosorption through miRNA targeting of a TGFβ ligand and provides new insights into the mechanism of density-dependent reproductive adaption in insects.

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“…Each ovariole was surrounded by basal lamina and consists of follicle cells and oocytes. The ultrastructure and function of follicles in locust ovary were described by ( Kimber, 1980 andDavies &King 1972).…”

Section: Introductionmentioning

confidence: 99%

Effect of Cascade, Oriza sativa bran extract and Karate on fine structure of the ovary of Schistocerca gregaria.

Hussein

Hamouda

Bakr

et al. 2008

Egyptian Academic Journal of Biological Sciences. A, Entomology

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The ultrastructure changes in the ovarian follicle of normal adult females and those developed from treated 5 th nymphal instar of Schistocerca gregaria with LC 50 of anti-chitin compound (cascade), plant extract (Oriza sativa bran extract) and synthetic pyrethroid (Karate) were examined. In the present study electron micrographs of follicle cells of treated adult females with previous compounds showed a degeneration of ovarioles and oocytes .There is also evidence of mitochondrial disintegration. It is also noticed that vacuoles were increased and enlarged in follicle cells and yolk bodies were cracked mostly in two halves.

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The ultrastructure of o�sorption in Locusta migratoria migratorioides

Cited by 7 publications

References 22 publications

Oösorption in the Coleopteran Sitophilus granorius (L.)

Oösorption in the Coleopteran Sitophilus granorius (L.)

Phase-related differences in egg production of the migratory locust regulated by differential oosorption through microRNA-34 targeting activinβ

Effect of Cascade, Oriza sativa bran extract and Karate on fine structure of the ovary of Schistocerca gregaria.

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