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The effect of temperature and light pulses on the induction of diapause in the Toyama strain of the Indian meal moth, Plodia interpunctella
Author(s) -
Kikukawa Shigeru,
Kubota Hideshi,
Ohkouchi Hiromi,
Tateiwa Kaori
Publication year - 1998
Publication title -
physiological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 57
eISSN - 1365-3032
pISSN - 0307-6962
DOI - 10.1046/j.1365-3032.1998.233088.x
Subject(s) - biology , diapause , photoperiodism , larva , zoology , period (music) , pulse (music) , light intensity , darkness , botany , electrical engineering , engineering , physics , optics , detector , acoustics
.The photoperiodic response in Plodia interpunctella collected at Toyama (36.7°N) was of long‐day type and highly sensitive to temperature. The critical photoperiod giving 50% diapause was between 14 and 16 h at 20°C, between 12 and 14 h at 25°C and between 6 and 8 h at 30°C. Effects of night interruption by a 2‐h light pulse on the diapause response were examined at 25°C on different background photoperiods ranging from LD 12:12 h to LD 2:22 h. Percentage diapause was very low when the middle portion of dark period was interrupted, so that U‐ or V‐shaped response curves were obtained with background scotophases longer than 12 h. In these curves, the descending slopes were less steep than the ascending slopes. The critical dark period measured from dusk to an interrupting light pulse was about 1.5 h longer than the critical dark period ( c . 10 h) in the normal photoperiodic response. The critical dark period from the interrupting light pulse to dawn, on the other hand, was not parallel to dawn but shorter than the normal critical period in LD 12:12 h and LD 10:14 h and longer than that in LD 7:17 h to LD 4:20 h, indicating that the priming effects of the light pulse might be under the influence of the photophase.