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RELATIONS BETWEEN THE FEEDING AND RADIO‐SENSITIVITY CYCLES AND THE ECDYSONE CYCLE IN BOMBYX MORI , AT THE END OF EMBRYONIC DEVELOPMENT AND DURING THE FIRST FOUR LARVAL INSTARS
Author(s) -
COULON MADELEINE
Publication year - 1977
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1111/j.1440-169x.1977.00181.x
Subject(s) - bombyx mori , ecdysis , ecdysone , instar , biology , larva , insect , hormone , medicine , endocrinology , botany , biochemistry , gene
The cycle of ecdysone secretion in Bombyx mori was determined at the end of embryonic development and during the first four larval instars by means of radio‐immunological titration (RIA). There is a relationship between this cycle and the radio‐sensitivity cycle of this insect. This radio‐sensitivity (tested through the percentage of abnormal ecdysis and of permanent larvae) is minimum when the hormone rate is important during X‐irradiation; the effect is maximum when the hormonal rate is minimum. The fall of the ecdysone rate during the first food‐intakes entails a reverse radio‐sensitivity.