Costs of Jasmonic Acid Induced Defense in Aboveground and Belowground Parts of Corn (Zea mays L.)
Costs of Jasmonic Acid Induced Defense in Aboveground and Belowground Parts of Corn (Zea mays L.)
复制标题
茉莉酸诱导玉米地上和地下部分防御的成本（Zea mays L.）
DOI：
10.1007/s10886-012-0155-1
复制
发表时间：
2012-08-01
影响因子：
2.3
通讯作者：
Jin, Qiong
中科院分区：
文献类型：
--
作者：
Feng, Yuanjiao;Wang, Jianwu;Jin, Qiong
茉莉酸（JA）诱导的植物防御的成本越来越受到关注。在这项研究中，JA连续应用于玉米（Zea mays L.）的地上（AG）或地下（BG）部分，或AG加BG部分，以研究植物某一部分的JA暴露是否会影响另一部分的防御反应，以及JA诱导的防御是否会产生分配成本。结果表明，对 AG 部分连续施用 JA 会系统性地影响根部防御化学物质的数量，反之亦然。植物不同部位在 JA 处理后 2 或 4 周，叶或根中的 DIMBOA 含量和酚类化合物总量普遍增加。在施用后的前2周内，叶和根中防御化学物质的增加伴随着根长度、根表面积和根生物量的显着下降。然而，施用 JA 四个星期后，没有检测到叶子和根中防御化学物质增加的成本。相反，芽生物量和根生物量增加。结果表明，JA 作为防御信号可以从玉米的 AG 部分转移到 BG 部分，反之亦然。连续使用 JA 引起的诱导防御成本在 2 周早期被发现，而在后期（即 JA 治疗后 4 周）观察到明显的益处。
Costs of jasmonic acid (JA) induced plant defense have gained increasing attention. In this study, JA was applied continuously to the aboveground (AG) or belowground (BG) parts, or AG plus BG parts of corn (Zea mays L.) to investigate whether JA exposure in one part of the plant would affect defense responses in another part, and whether or not JA induced defense would incur allocation costs. The results indicated that continuous JA application to AG parts systemically affected the quantities of defense chemicals in the roots, and vice versa. Quantities of DIMBOA and total amounts of phenolic compounds in leaves or roots generally increased 2 or 4 wk after the JA treatment to different plant parts. In the first 2 wk after application, the increase of defense chemicals in leaves and roots was accompanied by a significant decrease of root length, root surface area, and root biomass. Four weeks after the JA application, however, no such costs for the increase of defense chemicals in leaves and roots were detected. Instead, shoot biomass and root biomass increased. The results suggest that JA as a defense signal can be transferred from AG parts to BG parts of corn, and vice versa. Costs for induced defense elicited by continuous JA application were found in the early 2 wk, while distinct benefits were observed later, i.e., 4 wk after JA treatment.