Babst Benjamin A, Ferrieri Richard A, Gray Dennis W, Lerdau Manuel, Schlyer David J, Schueller Michael, Thorpe Michael R, Orians Colin M
Department of Biology, Tufts University, Medford, MA 02155, USA.
New Phytol. 2005 Jul;167(1):63-72. doi: 10.1111/j.1469-8137.2005.01388.x.
Here, we tested whether rapid changes in carbohydrate transport and partitioning to storage organs would be induced by jasmonic acid (JA), a plant-produced signal of herbivore attack known to induce resistance. Carbon-11, introduced as (11)CO(2), was used to track real-time carbohydrate transport and partitioning nondestructively in Populus species before and 12 h after application of JA to a single leaf. Jasmonic acid resulted in more rapid [(11)C]-photosynthate export from both local and systemic leaves, as well as greater partitioning of [(11)C]-photosynthate to the stem and roots. In Populus tremuloides, following JA treatment, leaf starch decreased, but there was no change in photosynthetic rates or leaf soluble sugar concentration, indicating that recent photosynthate was diverted from starch accumulation in the leaf to other plant organs. Increasing the supply of photosynthate to roots and stems may shield resources from folivorous predators, and may also facilitate both storage and nutrient uptake, and ultimately lead to greater tolerance, either by enhancing regrowth capacity or by replacing nutrients consumed by herbivores.
在此，我们测试了茉莉酸（JA）是否会诱导碳水化合物运输以及向储存器官分配的快速变化。茉莉酸是植物产生的一种食草动物攻击信号，已知其可诱导抗性。以（11）CO₂形式引入的碳-11被用于在对杨树单叶施用茉莉酸之前和之后12小时，无损地追踪杨树品种中碳水化合物的实时运输和分配情况。茉莉酸导致[（11）C]光合产物从局部和系统叶片中更快地输出，以及[（11）C]光合产物向茎和根的分配增加。在颤杨中，经过茉莉酸处理后，叶片淀粉减少，但光合速率或叶片可溶性糖浓度没有变化，这表明近期的光合产物从叶片中的淀粉积累转移到了其他植物器官。增加向根和茎的光合产物供应可能会使资源免受食叶捕食者的侵害，还可能促进储存和养分吸收，并最终通过增强再生能力或补充食草动物消耗的养分来提高耐受性。
