Die Steuerung der Ovarfunktion bei der ovoviviparen Schabe Leucophaea maderae (Fabr.)
Identifieur interne : 004044 ( Main/Exploration ); précédent : 004043; suivant : 004045Die Steuerung der Ovarfunktion bei der ovoviviparen Schabe Leucophaea maderae (Fabr.)
Auteurs : F. Engelmann [Suisse]Source :
- Journal of Insect Physiology [ 0022-1910 ] ; 1957.
Abstract
In the ovoviviparous roach Leucophaea the ovaries are inactive during pregnancy. The corpora allata show histologically an activity cycle (Fig. 3) which is correlated to the ovary cycle. During pregnancy the corpora allata are inactive. Implantation of active c. allata from nymphs into pregnant females results in a renewed ovarial activity. The eggs ripen, i.e. they grow, and yolk is deposited. This confirms the findings of Day (1943), Joly (1945), Scharrer (1943, 1946), Thomsen (1940), Wigglesworth (1936), and others that the c. allata produce a gonadotropic hormone in the adult female of many insects which is responsible for the ripening of the eggs in the ovary.The c. allata, and through them the ovary, can be activated during pregnancy by cutting the c. allatum nerve, or the median c. cardiacum nerve, or by destroying a certain part of the protocerebrum. This operation was also effective when the neurosecretory cells and the pathways of the neurosecretory material were untouched. From this it can be concluded that a nervous centre in the brain is responsible for an inhibition of the c. allata during pregnancy. But activation of the c. allata after these operations only occurs when the nerve connecting the c. allata with the suboesophageal ganglion remains intact. Thus the activity of the c. allata seems to be controlled by inhibitory centres in the brain and by stimulatory centres in the suboesophageal ganglion.The same inhibitory mechanism is also effective in the last nymphal stage when metamorphosis is initiated by a temporary inactivity of the c. allata.The c. allata can be activated during pregnancy by removal of the oötheca from the brood sac. This activation does not take place, however, if developing eggs are implanted into the body cavity immediately after the removal of the oötheca. This indicates that the developing eggs in the brood sac release a substance which causes the brain to inhibit the c. allata. It is probable that the yolk system is responsible for this effect.
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DOI: 10.1016/0022-1910(57)90041-0
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Engelmann</name></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:399A9BF4622B51CE0B840356CCC9F6B3CF16BCD1</idno><date when="1957" year="1957">1957</date><idno type="doi">10.1016/0022-1910(57)90041-0</idno><idno type="url">https://api.istex.fr/document/399A9BF4622B51CE0B840356CCC9F6B3CF16BCD1/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001098</idno><idno type="wicri:Area/Istex/Curation">001098</idno><idno type="wicri:Area/Istex/Checkpoint">001A33</idno><idno type="wicri:doubleKey">0022-1910:1957:Engelmann F:die:steuerung:der</idno><idno type="wicri:Area/Main/Merge">004213</idno><idno type="wicri:Area/Main/Curation">004044</idno><idno type="wicri:Area/Main/Exploration">004044</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="de">Die Steuerung der Ovarfunktion bei der ovoviviparen Schabe Leucophaea maderae (Fabr.)</title><author><name sortKey="Engelmann, F" sort="Engelmann, F" uniqKey="Engelmann F" first="F." last="Engelmann">F. Engelmann</name><affiliation wicri:level="3"><country xml:lang="fr">Suisse</country><wicri:regionArea>Abteilung für Zoophysiologie, Zoologisches Institut der Universität, Bern</wicri:regionArea><placeName><settlement type="city">Berne</settlement><region type="région" nuts="3">Canton de Berne</region></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Insect Physiology</title><title level="j" type="abbrev">IP</title><idno type="ISSN">0022-1910</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1957">1957</date><biblScope unit="volume">1</biblScope><biblScope unit="issue">3</biblScope><biblScope unit="page" from="257">257</biblScope><biblScope unit="page" to="262">262</biblScope></imprint><idno type="ISSN">0022-1910</idno></series><idno type="istex">399A9BF4622B51CE0B840356CCC9F6B3CF16BCD1</idno><idno type="DOI">10.1016/0022-1910(57)90041-0</idno><idno type="PII">0022-1910(57)90041-0</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0022-1910</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="de">de</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In the ovoviviparous roach Leucophaea the ovaries are inactive during pregnancy. The corpora allata show histologically an activity cycle (Fig. 3) which is correlated to the ovary cycle. During pregnancy the corpora allata are inactive. Implantation of active c. allata from nymphs into pregnant females results in a renewed ovarial activity. The eggs ripen, i.e. they grow, and yolk is deposited. This confirms the findings of Day (1943), Joly (1945), Scharrer (1943, 1946), Thomsen (1940), Wigglesworth (1936), and others that the c. allata produce a gonadotropic hormone in the adult female of many insects which is responsible for the ripening of the eggs in the ovary.The c. allata, and through them the ovary, can be activated during pregnancy by cutting the c. allatum nerve, or the median c. cardiacum nerve, or by destroying a certain part of the protocerebrum. This operation was also effective when the neurosecretory cells and the pathways of the neurosecretory material were untouched. From this it can be concluded that a nervous centre in the brain is responsible for an inhibition of the c. allata during pregnancy. But activation of the c. allata after these operations only occurs when the nerve connecting the c. allata with the suboesophageal ganglion remains intact. Thus the activity of the c. allata seems to be controlled by inhibitory centres in the brain and by stimulatory centres in the suboesophageal ganglion.The same inhibitory mechanism is also effective in the last nymphal stage when metamorphosis is initiated by a temporary inactivity of the c. allata.The c. allata can be activated during pregnancy by removal of the oötheca from the brood sac. This activation does not take place, however, if developing eggs are implanted into the body cavity immediately after the removal of the oötheca. This indicates that the developing eggs in the brood sac release a substance which causes the brain to inhibit the c. allata. It is probable that the yolk system is responsible for this effect.</div></front></TEI><affiliations><list><country><li>Suisse</li></country><region><li>Canton de Berne</li></region><settlement><li>Berne</li></settlement></list><tree><country name="Suisse"><region name="Canton de Berne"><name sortKey="Engelmann, F" sort="Engelmann, F" uniqKey="Engelmann F" first="F." last="Engelmann">F. Engelmann</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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