title: Molecular characterization of soluble and membrane-bound trehalases of the whitefly, Bemisia tabaci.
abstract: Trehalases (Tres) have been demonstrated to be the key enzymes that are involved in various trehalose-associated physiological processes in insects. However, little attention has been devoted to the Tres in the whitefly, Bemisia tabaci. In this study, a soluble Tre (BtTre-1) and a membrane-bound Tre (BtTre-2) were cloned in the invasive cryptic species Middle East-Asia Minor 1 (MEAM1) of the whitefly B. tabaci complex. Alignment of deduced amino acids sequences of both BtTres revealed that they share common consensus regions and residues with Tres of other insect species. Levels of BtTres expression in various stages and tissues of the whitefly suggested that BtTre-2 may play a key role in trehalose catabolism during development of the whitefly, especially for oocyte development, while BtTre-1 may prevent trehalose in salivary gland from leaking and entering into plants along with saliva. Potential roles of trehalose catabolism in response to direct and/or plant-mediated indirect effects of Tomato Yellow Leaf Curl China Virus (TYLCCNV) were also detected. Whiteflies feeding on virus-infected tobacco plants showed higher BtTres expressions and accordingly higher BtTres activity but lower trehalose content than those feeding on uninfected plants. The enhanced trehalose catabolism may be beneficial to oocyte development in ovary and attenuate plant defensive responses induced by trehalose in saliva. Viruliferous and nonviruliferous whiteflies feeding on cotton, a nonhost plant for TYLCCNV, differed significantly only in trehalose content. The higher trehalose content in viruliferous whiteflies may be conducive to resisting the stress inflicted by TYLCCNV.
authors.affiliation: Ministry of Agriculture Key Laboratory of Agricultural Entomology, Institute of Insect Sciences, Zhejiang University, Hangzhou, China; Institute of Entomology, College of Plant Protection, Southwest University, Chongqing, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Wang
authors.forename: Wen-Bo
authors.initials: WB
authors.lastname: He
authors.forename: Yun-Lin
authors.initials: YL
authors.lastname: Su
authors.forename: Xiao-Li
authors.initials: XL
authors.lastname: Bing
authors.forename: Shu-Sheng
authors.initials: SS
authors.lastname: Liu
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D053839:Begomovirus; D005260:Female; D003368:Gossypium; D006430:Hemiptera / Q000201:enzymology* / Q000235:genetics*; D058865:Introduced Species; D008969:Molecular Sequence Data; D009758:Nymph; D009865:Oocytes; D010053:Ovary; D011679:Pupa; D012469:Salivary Glands / Q000201:enzymology*; D014026:Nicotiana / Q000382:microbiology; D014198:Trehalase / Q000737:chemistry* / Q000378:metabolism; D014199:Trehalose / Q000378:metabolism*
chemical_list: D014199:Trehalose; D014198:Trehalase
keywords: Bemisia tabaci; Tomato Yellow Leaf Curl China Virus; trehalase; trehalose