| Title: | Effects of exogenous spermidine on poplar resistance to leaf and root herbivory as affected by soil cadmium stress |
| Author(s): | Qin S; Wu Z; Tang J; Zhu G; Chen G; Chen L; Lei H; Wang X; Zhu T; Lin T; |
| Address: | "Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China. College of Agriculture, Sichuan Agricultural University, 611130, Chengdu, China. Key Laboratory of National Forestry & Grassland Administration on Forest Resources Conservation and Ecological Safety in the Upper Reaches of the Yangtze River, College of Forestry, Sichuan Agricultural University, 611130, Chengdu, China. Electronic address: tlin@sicau.edu.cn" |
| DOI: | 10.1016/j.jenvman.2021.112467 |
| ISSN/ISBN: | 1095-8630 (Electronic) 0301-4797 (Linking) |
| Abstract: | "Elemental defense hypothesis (EDH) proposed that metal accumulation in plants could increase plant resistance to herbivores. However, the over-accumulation of metals in low-accumulators such as woody plants will cause adverse effects on plant health. Thus, the application of EDH on low-accumulators in metal contaminated areas is strongly limited. Since the supplement of exogenous spermidine (Spd) was reported to alleviate metal-induced toxicity in plants while stimulating metal accumulation in plant tissues, we hypothesized that such application will further improve plant resistance to herbivores. In this study, we employed a woody plant species, Populus yunnanensis, to test this hypothesis. We first tested a Spd concentration series applied on plants subjected to soil cadmium (Cd) stress and found that the 1 mM Spd strongly promoted plant growth while stimulated Cd accumulation in plant leaves and roots. We further conducted herbivore bioassays to test the growth performance and feeding preference of two leaf herbivore species and a root herbivore species that fed on plants from different treatments. The results showed that the inhibition effect of Cd stressed-plants on herbivore growth was significantly magnified by the addition of Spd. The growth weight of all the three tested herbivores were negatively correlated with increased Cd concentrations in plant tissues. In addition, the feeding preferences of the two leaf herbivore species were strongly repelled by leaf discs from Cd-treated plants with Spd supplement. The results suggested that the application of exogenous Spd at a certain dose could enhance elemental defense of plants against herbivory" |
| Keywords: | *Cadmium/toxicity Herbivory Plant Leaves *Populus Soil Spermidine Elemental defense hypothesis Feeding deterrence Growth inhibition Heavy metals Populus yunnanensis; |
| Notes: | "MedlineQin, Siyu Wu, Zhengqin Tang, Jiayao Zhu, Guoqing Chen, Gang Chen, Lianghua Lei, Hao Wang, Xuegui Zhu, Tianhui Lin, Tiantian eng England 2021/04/07 J Environ Manage. 2021 Jun 15; 288:112467. doi: 10.1016/j.jenvman.2021.112467. Epub 2021 Apr 7" |
