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Role of natural day-length and temperature in determination of summer and winter diapause in Pieris melete (Lepidoptera: Pieridae)

Published online by Cambridge University Press:  26 October 2011

H.J. Xiao
Affiliation:
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Province; Key Laboratory of Physiology, Ecology and Cultivation of Double Cropping Rice, Ministry of Agriculture, Institute of Entomology, Jiangxi Agricultural UniversityNanchang, 330045, China
S.H. Wu
Affiliation:
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Province; Key Laboratory of Physiology, Ecology and Cultivation of Double Cropping Rice, Ministry of Agriculture, Institute of Entomology, Jiangxi Agricultural UniversityNanchang, 330045, China
H.M. He
Affiliation:
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Province; Key Laboratory of Physiology, Ecology and Cultivation of Double Cropping Rice, Ministry of Agriculture, Institute of Entomology, Jiangxi Agricultural UniversityNanchang, 330045, China
C. Chen
Affiliation:
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Province; Key Laboratory of Physiology, Ecology and Cultivation of Double Cropping Rice, Ministry of Agriculture, Institute of Entomology, Jiangxi Agricultural UniversityNanchang, 330045, China
F.S. Xue*
Affiliation:
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Jiangxi Province; Key Laboratory of Physiology, Ecology and Cultivation of Double Cropping Rice, Ministry of Agriculture, Institute of Entomology, Jiangxi Agricultural UniversityNanchang, 330045, China
*
*Author for correspondence Fax: +86791 3828081 E-mail: xue_fangsen@hotmail.com

Abstract

Under field conditions, the cabbage butterfly, Pieris melete, displays a pupal summer diapause in response to relatively low daily temperatures and gradually increasing day-length during spring and a pupal winter diapause in response to the progressively shorter day-length. To determine whether photoperiod is ‘more’ important than temperature in the determination of summer and winter diapause, or vice versa, the effects of naturally changing day-length and temperature on the initiation of summer and winter diapause were systematically investigated under field conditions for five successive years. Field results showed that the incidence of summer diapause significantly declined with the naturally increasing temperature in spring and summer generations. Path coefficient analysis showed that the effect of temperature was much greater than photoperiod in the determination of summer diapause. In autumn, the incidence of diapause was extremely low when larvae developed under gradually shortening day-length and high temperatures. The incidence of winter diapause increased to 60–90% or higher with gradually shortening day-length combined with temperatures between 20.0°C and 22.0°C. Decreasing day-length played a more important role in the determination of winter diapause induction than temperature. The eco-adaptive significance of changing day-length and temperature in the determination of summer and winter diapause was discussed.

Type
Research Paper
Copyright
Copyright © Cambridge University Press 2011

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