Opsins are involved in nymphal photoperiodic responses in the cricket Modicogryllus siamensis

Saori Tamaki, Saki Takemoto, Outa Uryu, Yuichi Kamae, Kenji Tomioka

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

The cricket Modicogryllus siamensis Chopard shows photoperiod-dependent changes in the duration of nymphal development: nymphs become adult within 60days after hatching, undergoing seven moults under long-day conditions, whereas, under short-day conditions, nymphal development takes much longer (approximately 180days) with an increased number of moults. Because removal of the compound eyes alters this photoperiodic response, the eyes may be involved in light detection during the photoperiodic response. The role of opsins, expressed in the compound eye, is examined in the present study with reference to the photoperiodic response. Molecular cloning identifies cDNAs of three opsins, opsin-Ultra Violet (Ms'op-UV), opsin-Blue (Ms'op-B) and opsin-Long Wave (Ms'op-LW), and in situ hybridization reveals that the opsin genes are expressed in specific regions of the compound eye in a gene-specific manner. RNA interference (RNAi) technology using the opsin genes results in a partial disruption in the long-day responses; most of the treated crickets showed eight or more moults and up to 23.5% show a prolonged nymphal period that is typical of short-day responses. Under short-day conditions, op-UV RNAi crickets show earlier adult development, whereas no distinct alterations are observed in op-B and op-LW RNAi insects. The results suggest that the opsin genes may play differential roles in the photoperiodic response in the cricket and that the results can be at least partially explained in terms of the external coincidence model of photoperiodic time measurement.

Original languageEnglish
Pages (from-to)163-172
Number of pages10
JournalPhysiological Entomology
Volume38
Issue number2
DOIs
Publication statusPublished - Jun 2013

Fingerprint

Opsins
Gryllidae
opsin
cricket
molt
RNA
gene
compound eyes
RNA Interference
RNA interference
molting
Genes
photoperiod
hatching
Viola
genes
Nymph
insect
Photoperiod
Molecular Cloning

Keywords

  • Circadian clock
  • Cricket
  • External coincidence
  • Nymphal development
  • Opsin
  • Photoperiodic time measurement

ASJC Scopus subject areas

  • Insect Science
  • Physiology
  • Ecology, Evolution, Behavior and Systematics

Cite this

Opsins are involved in nymphal photoperiodic responses in the cricket Modicogryllus siamensis. / Tamaki, Saori; Takemoto, Saki; Uryu, Outa; Kamae, Yuichi; Tomioka, Kenji.

In: Physiological Entomology, Vol. 38, No. 2, 06.2013, p. 163-172.

Research output: Contribution to journalArticle

Tamaki, Saori ; Takemoto, Saki ; Uryu, Outa ; Kamae, Yuichi ; Tomioka, Kenji. / Opsins are involved in nymphal photoperiodic responses in the cricket Modicogryllus siamensis. In: Physiological Entomology. 2013 ; Vol. 38, No. 2. pp. 163-172.
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