| Title: | The oriental armyworm ( Mythimna separata) feeding induces systemic defence responses within and between maize leaves |
| Author(s): | Malook SU; Qi J; Hettenhausen C; Xu Y; Zhang C; Zhang J; Lu C; Li J; Wang L; Wu J; |
| Address: | "1 Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201 , People's Republic of China. 2 University of Chinese Academy of Sciences , Beijing 100049 , People's Republic of China" |
| Journal Title: | Philos Trans R Soc Lond B Biol Sci |
| ISSN/ISBN: | 1471-2970 (Electronic) 0962-8436 (Print) 0962-8436 (Linking) |
| Abstract: | "Maize ( Zea mays) is a staple cereal crop cultivated all over the world but that is threatened by various insects. Feeding of the lepidopteran insect Mythimna separata triggers defence signalling and increases anti-herbivore benzoxazinoids (Bxs) in the insect-damaged maize leaves. However, the herbivory-elicited within-leaf and leaf-to-leaf systemic signalling in maize remains largely unexplored. Here, we show that simulated M. separata herbivory and mechanical wounding elicited increased levels of jasmonic acid (JA), JA-Ile (JA-isoleucine conjugate) and Bxs in the damaged areas and in specific systemic regions within a leaf. Importantly, increased contents of Bxs were detected in a systemic leaf, and consistently, this leaf exhibited increased defence against M. separata. Increased JA/JA-Ile and altered transcriptome, including Bx biosynthesis genes, were detected in systemic leaves after wounding or simulated herbivory treatments, although only simulated herbivory induced increase of the contents of Bxs systemically. Promoter and co-expression analysis revealed that transcription factors bHLH57 and WRKY34 may regulate Bx biosynthesis genes in systemic leaves. Moreover, leaf ablation experiment indicated that the systemic signal rapidly exited the local leaves within 30 min after elicitation. This study provides new insight into the temporal and spatial regulation of defence responses of maize against lepidopteran insects. This article is part of the theme issue 'Biotic signalling sheds light on smart pest management'" |
| Keywords: | Animals *Antibiosis Cyclopentanes/pharmacology Feeding Behavior *Herbivory Isoleucine/pharmacology Larva/physiology Moths/growth & development/*physiology Oxylipins/pharmacology Plant Leaves/physiology *Signal Transduction Zea mays/*physiology benzoxazino; |
| Notes: | "MedlineMalook, Saif Ul Qi, Jinfeng Hettenhausen, Christian Xu, Yuxing Zhang, Cuiping Zhang, Jingxiong Lu, Chengkai Li, Jing Wang, Lei Wu, Jianqiang eng Research Support, Non-U.S. Gov't England 2019/04/11 Philos Trans R Soc Lond B Biol Sci. 2019 Mar 4; 374(1767):20180307. doi: 10.1098/rstb.2018.0307" |
