Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1999-6-25
pubmed:abstractText
The synthesis of juvenile hormone in vitro by diapausing and nondiapausing Culex pipiens L. was measured by radiochemical assay. Paired corpora allata from diapausing females synthesized < 18 fmols of juvenile hormone per hour during the first 3 wk after emergence. In contrast, juvenile hormone synthesis in nondiapausing females increased rapidly reaching a peak of 87.3 +/- 21 (mean +/- SE) fmol/h 3 d after emergence. By 3 wk, juvenile hormone synthesis had decreased in both groups of females, but corpora allata from nondiapausing mosquitoes still were 3 times more active than those from diapausing mosquitoes. By 16 wk after diapause induction, females maintained at 8:16 (L:D) h and 15 degrees C produced levels of juvenile hormone similar to 3-wk-old nondiapausing females. When females were held in diapause conditions for up to 22 wk, follicles gradually grew longer and by 15 wk were significantly longer than in the previous 14 wk. Blood feeding also increased in older females, indicating that over time, juvenile hormone synthesis gradually stimulated blood-feeding behavior. When 21-d-old diapausing mosquitoes were moved to a long-day photoperiod of 16:8 (L:D) h and 26 degrees C, juvenile hormone synthesis increased rapidly and peaked 5 d later while the ovarian follicles grew to the resting stage. Allatectomy of young diapausing females prevented follicle growth and blood feeding when diapause was terminated prematurely, demonstrating that the physiological events associated with diapause termination were associated with juvenile hormone biosynthesis.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
May
pubmed:issn
0022-2585
pubmed:author
pubmed:issnType
Print
pubmed:volume
36
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
355-60
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1999
pubmed:articleTitle
Juvenile hormone biosynthesis in diapausing and nondiapausing Culex pipiens (Diptera: Culicidae).
pubmed:affiliation
Entomology Department, Texas A&M University 77843-2475, USA.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't