Diapause termination and post-diapause of overwintering Clanis bilineata tsingtauica larvae
Author of the article:GUO Ming-Ming LI Xiao-Feng DENG Pan LI Da-Wei LI Jun-Ling FAN Ji-Wei CHEN Feng
Author's Workplace:Lianyungang Academy of Agricultural Sciences, Lianyungang 222000, China; Jiangsu Academy of Agricultural Sciences Institute of Leisure Agriculture, Nanjing 210000, China; Yuntai Branch of Jiangsu Provincial Agricultural Reclamation and Development Corporation, Lianyungang 222063, China
Key Words:Clanis bilineata tsingtauica; temperature; diapause termination; biological characteristics
Abstract:
[Objectives] To investigate the
mechanism of diapause termination in Clanis bilineata tsingtauica which
mainly enters diapause as mature larvae. [Methods] Larvae
were kept under four different temperature
gradients under constant humidity and differences in
diapause duration, pupation and emergence between these temperature treatment
groups was compared. [Results] The duration of diapause
and the pupal stage gradually shortened as temperature increased, reaching
minimum values of (34.4±0.3) d and (6.7±1.2)
d, respectively at 35 ℃.
The pupation rate and pupal weight first increased, then decreased, with
increasing temperature. The
maximum pupation rate was (80.60±0.26)
% at 25 ℃ and
the maximum average pupal weight was (4.21±0.07)
g at 30 ℃. The adult emergence rate
decreased significantly with increasing temperature. The oviposition rate
reached a maximum of (204±9) eggs/female at
25 ℃.
These results show that the diapause
status of Clanis bilineata tsingtauica could be reversed when the effective accumulated
temperature reached 1 111.1 degree·days at room temperature. [Conclusion] The post-diapause growth and development of Clanis bilineata tsingtauica was optimal after diapause termination at a temperature of 25 ℃.