Diapause and Overwintering Capabilities of the Larva ofHomoeosoma electellum(Lepidoptera: Pyralidae)
作者:
Robert R. Rojas,
John G. Riemann,
Roger A. Leopold,
期刊:
Environmental Entomology
(OUP Available online 1989)
卷期:
Volume 18,
issue 4
页码: 552-557
ISSN:0046-225X
年代: 1989
DOI:10.1093/ee/18.4.552
出版商: Oxford University Press
关键词: Insecta;diapause;overwintering;Homoeosoma electellum
数据来源: OUP
摘要:
Before cold acclimation, diapausing mature larvae ofHomoeosoma electellum(Hulst) have glycogen levels two times greater than nondiapausing mature larvae, trehalose levels are 30 times greater, and larvae have a lower supercooling point by approximately 8°C. Significant increases in trehalose occurred in diapausing larvae kept at 5°C for 7 and 18 d and at 0°C after 10 d. In most cases, there was a sufficient concomitant reduction in glycogen to account for the trehalose increases. Nondiapausing larvae in the temperature treatment groups of 10, 5, and 0°Cshowed significantly greater trehalose levels over initial values; yet these levels are almost two times lower than initial levels in diapausing larvae and three times lower than the greatest levels achieved in this study by diapausing larvae cold-acclimated to 0°C. No specific relationship was found between temperature acclimation and supercooling capacity in diapausing or nondiapausing larvae. Nondiapausing larvae died after being held at −10°C for 1 d, whereas 44% of the diapausing larvae survived to pupation after 3 d of exposure.
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