Different headspace profiles in wild crucifer species in response to Plutella xylostella herbivory and exogenous jasmonic acid application  

作　　者：Peng-Jun Zhang Jin-Ping Shu Marcel Dicke Shu-Sheng Liu 

机构地区：[1]Institute of Insect Sciences, Zhejiang University, Hangzhou, China [2]Laboratory of Entomology, Wageningen University, Wageningen, The Netherlands

出　　处：《Insect Science》2010年第1期29-37,共9页昆虫科学（英文版）

基　　金：This study was funded by the National Natural Science Foundation of China （Project No. 30571225） and The China National Science-Technology Support Program （Project No. 2006BAD08A08）.

摘　　要：Although exogenous treatment of plants withjasmonic acid （JA） may result in induced responses similar to plant defences induced by herbivory, few studies have compared the details of insect herbivory and JA-mimicked responses. We compared volatiles of two crucifer species, Cardamine impatiens and Lepidium virginicum, in response to Plutella xylostella larval feeding and exogenous application of JA, over the entire period of time when induced changes were detectable. Significant differences in the composition and timing of volatiles occurred between herbivory and JA treatments in both plants. The quantity ofnitrile and isothiocyanate released in response to herbivory was significantly larger than that upon JA treatment. In each of the two plant species, most volatile components were emitted immediately upon larval feeding and their quantity dropped rapidly once feeding ceased. In contrast, the emission of volatiles in response to JA treatment lasted for a longer period of time, and the maximum emission rate was recorded 2 and 3 days after JA treatment in L. virginicum and C. impatiens respectively. These findings are discussed in the context of signal-transduction pathways and mechanisms involved in induced emissions of plant volatiles, as well as induced defences mediated by plant volatiles.Although exogenous treatment of plants withjasmonic acid （JA） may result in induced responses similar to plant defences induced by herbivory, few studies have compared the details of insect herbivory and JA-mimicked responses. We compared volatiles of two crucifer species, Cardamine impatiens and Lepidium virginicum, in response to Plutella xylostella larval feeding and exogenous application of JA, over the entire period of time when induced changes were detectable. Significant differences in the composition and timing of volatiles occurred between herbivory and JA treatments in both plants. The quantity ofnitrile and isothiocyanate released in response to herbivory was significantly larger than that upon JA treatment. In each of the two plant species, most volatile components were emitted immediately upon larval feeding and their quantity dropped rapidly once feeding ceased. In contrast, the emission of volatiles in response to JA treatment lasted for a longer period of time, and the maximum emission rate was recorded 2 and 3 days after JA treatment in L. virginicum and C. impatiens respectively. These findings are discussed in the context of signal-transduction pathways and mechanisms involved in induced emissions of plant volatiles, as well as induced defences mediated by plant volatiles.

关 键 词：Brassicaceae HERBIVORY induced response jasmonic acid Plutella xylostella volatile emission 

分 类 号：S436.3[农业科学—农业昆虫与害虫防治] S482.84[农业科学—植物保护]