Scientia Agricultura Sinica ›› 2017, Vol. 50 ›› Issue (19): 3733-3744.doi: 10.3864/j.issn.0578-1752.2017.19.010

• PLANT PROTECTION • Previous Articles     Next Articles

Daily Expression of Clock Gene in Compound Eye of Helicoverpa armigera

YAN Shuo1,2, LIU YanJun1, ZHANG XinFang3, QIN Meng2, LIU Hui2, ZHU JiaLin4, LI Zhen1, ZHANG QingWen1, LIU XiaoXia1   

  1. 1College of Plant Protection, China Agricultural University, Beijing 100193; 2National Agricultural Technology Extension and Service Center, Beijing 100125; 3Changli Institute of Pomology, Hebei Academy of Agriculture and Forestry Sciences, Changli 066600, Hebei; 4Beijing Entry-Exit Inspection and Quarantine Bureau, Beijing 100026
  • Received:2017-05-12 Online:2017-10-01 Published:2017-10-01

Abstract: 【Objective】The objective of this study is to clone and analyze a circadian clock gene, Clock (Clk) in the compound eyes of Helicoverpa armigera, examine the diurnal changes and determinants of Clk mRNA levels in compound eyes of cotton bollworm, and to determine whether Clk performed circadian functions in compound eyes, which will provide a theoretical reference for understanding the circadian clock machinery in compound eyes. 【Method】The total RNA was isolated from the compound eyes of 2-day-old H. armigera moths, and the Clk was cloned by reverse transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE). The amino acid sequence of CLK from cotton bollworm was analyzed using bioinformatics softwares. The relative mRNA levels of Clk were determined among various adult organs (head, thorax, abdomen, leg, wing, brain, antennae and compound eye) of H. armigera by quantitative real-time PCR (qRT-PCR). The diurnal change of Clk mRNA levels in compound eyes was measured under different photoperiods. Moths were illuminated by UV, blue and green lights, respectively, for 6 h from the beginning of the scotophase, and the expression levels of Clk in compound eyes were determined after light exposure. Female and male moths were paired for mating, and the expression levels of Clk in compound eyes were determined from the moths that had completed mating 0 h and 3 h. The expression levels of Clk in compound eyes were determined from the moths that were not fed. 【Result】An open reading frame of 1 860 bp was cloned, encoding 619 amino acids, designed as “HeCLK” (GenBank accession number KM233158). The molecular mass of the deduced protein was predicted to be 69.32 kD, and the calculated isoelectric point (pI) was 5.71. Deduced amino acids sequence contained three transmembrane topologies, and several conserved domains of insect CLK (PAS and HLH). HeCLK showed high homology with Spodoptera exigua (97% identity) and Danaus plexippus (74% identity), and low homology with Riptortus pedestris (53% identity) and Leptinotarsa decemlineata (52% identity). qRT-PCR revealed that HeCLK showed the lowest mRNA levels in compound eyes, and the highest mRNA levels in antennas among tested adult organs. The mRNA levels of HeCLK in compound eyes increased during the day, and decreased during the night under 14L﹕10D. The cycling of the circadian clock gene mRNA levels persisted for 1 d under dark condition, but did not persist further under constant darkness. HeCLK was up-regulated in compound eyes after light exposure, but there was no significant difference in mRNA levels of HeCLK among different wavelengths of light. The expression levels of HeCLK were tended to be down-regulated in the compound eyes after copulation, and there was a significant difference in mRNA levels of HeCLK between mated males and virgin males. The expression levels of HeCLK in compound eyes were not influenced by starvation. 【Conclusion】HeCLK from the compound eyes of a nocturnal moth, H. armigera, was cloned. Deduced amino acids sequence contained the conserved domains of CLK proteins, and shared high homology with insect CLK. HeCLK showed the lowest mRNA levels in compound eyes among tested adult organs. The expression levels of HeCLK in peripheral tissues (compound eyes) were regulated by the circadian rhythms, light condition and physiological status of moths, confirming that HeCLK played an important role in circadian rhythms in compound eyes. Whether the circadian clock machinery is similar between compound eyes and the central nervous system need to be further studied.

Key words: Helicoverpa armigera, circadian clock, compound eye, photoreceptor, peripheral tissue, rhythm

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