Identification and expression profiles analysis of odorant ‐binding proteins in soybean aphid, Aphis glycines (Hemiptera: Aphididae)
AbstractThe soybean aphid,Aphis glycines, is an extreme specialist and an important invasive pest that relies on olfaction for behaviors such as feeding, mating, and foraging. Odorant ‐binding proteins (OBPs) play a vital role in olfaction by binding to volatile compounds and by regulating insect sensing of the environment. In this work we used rapid amplification of complementary DNA ends technology to identify and characterize 10 genes encodingA. glycines OBPs (AglyOBPs) belonging to 3 subfamilies, including 4 classic OBPs, 5 Plus ‐C OBPs, and one Minus‐C OBP. Quantitative real‐time polymerase chain reaction demonstrated variable specific expression patterns for the 10 genes based on developmental stage and aphid tissue sampled. Expression levels of 7AglyOBPs (2,3,4,5,7,9, and10) were highest in the 4th instar, indicating that the 4th nymphal instar is an important developmental period during which soybean aphids regulate feeding and search for host plants. Tissue ‐specific expression results demonstrated thatAglyOBP2,7, and9 exhibited significantly higher expression levels in antennae. Meanwhile, ligand ‐binding analysis of 5 OBPs demonstrated binding of AglyOBP2 and AglyOBP3 to a broad spectrum of volatiles released by green leaf plants, with bias toward 6‐ to 8‐carbon chain volatiles and strong binding of AglyOBP7 totrans‐β‐farnesene. Taken together, our findings build a foundation of knowledge for use in the study of molecular olfaction mechanisms a...
Source: Insect Science - Category: Biology Authors: Ling Wang,
Ying ‐Dong Bi,
Ming Liu,
Wei Li,
Miao Liu,
Shu‐Feng Di,
Shuai Yang,
Chao Fan,
Lei Bai,
Yong‐Cai Lai Tags: ORIGINAL ARTICLE Source Type: research