title: Transcription of four Rhopalosiphum padi (L.) heat shock protein genes and their responses to heat stress and insecticide exposure.
abstract: The bird cherry-oat aphid, Rhopalosiphum padi (L.), a worldwide destructive pest, is more heat tolerant than other wheat aphids, and it has developed resistance to different insecticides. Heat shock proteins (HSPs) play an important role in coping with environmental stresses. To investigate Hsp transcriptional responses to heat and insecticide stress, four full-length Hsp genes from R. padi (RpHsp60, RpHsc70, RpHsp70-1, and RpHsp70-2) were cloned. Four RpHsps were expressed during all R. padi developmental stages, but at varying levels. The mRNA levels of RpHsps were increased under thermal stress and reached maximal induction at a lower temperature (36°C) in the alate morph than in the apterous morph (37°C or 38°C). RpHsp expressions under heat stress suggest that RpHsp70-1 and RpHsp70-2 are inducible in both apterous and alate morphs, RpHsc70 is only heat-inducible in apterous morph, and RpHsp60 exhibits poor sensitivity to heat stress. The pretreatment at 37°C significantly increase both the survival rate and the RpHsps expression level of R. padi at subsequent lethal temperature. Under exposure to two sublethal concentrations (LC10and LC30) of beta-cypermethrin, both RpHsp70-1 and RpHsp70-2 expressions were induced and reached a maximum 24h after exposure. In contrast, expression of RpHsp60 was not induced by either sublethal concentration of beta-cypermethrin. Moreover, the responses of RpHsp70-1 and RpHsp70-2 to heat shock were more sensitive than those to beta-cypermethrin. These results suggest that induction of RpHsp expression is related to thermal tolerance, and that RpHsp70-1 and RpHsp70-2 are the primary genes involved in the response to both heat and pesticide stress.
authors.affiliation: College of Plant Protection, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling 712100, China.
authors.forename: Yuting
authors.initials: Y
authors.lastname: Li
authors.affiliation: College of Plant Protection, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling 712100, China.
authors.forename: Qi
authors.initials: Q
authors.lastname: Zhao
authors.affiliation: College of Plant Protection, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling 712100, China.
authors.forename: Xinle
authors.initials: X
authors.lastname: Duan
authors.affiliation: Technology Center of China Tobacco Yunnan Industrial Co., Ltd., Kunming, Yunnan 650106, China.
authors.forename: Chunman
authors.initials: C
authors.lastname: Song
authors.affiliation: College of Plant Protection, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Key Laboratory of Crop Pest Integrated Pest Management on the Loess Plateau of Ministry of Agriculture, Yangling 712100, China.. Electronic address: maohua.chen@nwsuaf.edu.cn.
authors.forename: Maohua
authors.initials: M
authors.lastname: Chen
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001042:Aphids / Q000235:genetics* / Q000502:physiology; D001483:Base Sequence; D003001:Cloning, Molecular; D015870:Gene Expression; D017344:Genes, Insect; D006360:Heat-Shock Proteins / Q000235:genetics*; D006358:Hot Temperature / Q000009:adverse effects; D019476:Insect Proteins / Q000235:genetics*; D007306:Insecticides; D010802:Phylogeny; D011722:Pyrethrins; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017386:Sequence Homology, Amino Acid; D013312:Stress, Physiological; D000071436:Thermotolerance / Q000235:genetics / Q000502:physiology
chemical_list: D006360:Heat-Shock Proteins; D019476:Insect Proteins; D007306:Insecticides; D011722:Pyrethrins; D012333:RNA, Messenger; C017160:cypermethrin
keywords: Development; Heat shock protein; Heat stress; Insecticide; Rhopalosiphum padi