Department of Plant Agriculture, University of Guelph, Guelph, Ontario N1G 2W1, Canada.
J Chem Ecol. 2009 Nov;35(11):1363-72. doi: 10.1007/s10886-009-9715-4. Epub 2009 Dec 1.
A study of two related plants (Antirrhinum majus L. and Linaria vulgaris Mill.) containing the same defensive compound (the iridoid glucoside, antirrhinoside) but with reproductive strategies that differ during ontogeny was undertaken. Young leaves are important to plants due to their higher photosynthetic rates and, therefore, should be better protected with higher concentrations of defensive compounds such as antirrhinoside. Declining concentrations of antirrhinoside as leaves aged was found for A. majus but this was generally not the case for L. vulgaris. Concentrations of antirrhinoside in root tissue were low and constant throughout ontogeny for A. majus whereas for L. vulgaris root levels of antirrhinoside were high during the period when vegetative growth is its sole means of reproduction. Antirrhinoside in L. vulgaris roots declined relative to A. majus roots during budding and flowering. During flowering, significantly less antirrhinoside and relative biomass are devoted to L. vulgaris flowers than in A. majus. While these findings are consistent with Optimal Defense Theory (ODT) further work on the distribution of antirrhinoside and the effect of insect herbivory on plant fitness in other related species is needed.
进行了一项关于两种具有相同防御化合物（环烯醚萜苷，antirrhinoside）但在个体发育过程中具有不同繁殖策略的相关植物（金鱼草和普通黄花九轮草）的研究。由于年轻的叶子具有更高的光合作用率，因此对植物很重要，因此应该用更高浓度的防御化合物（如 antirrhinoside）更好地保护它们。发现金鱼草的叶子随着年龄的增长而降低了 antirrhinoside 的浓度，但普通黄花九轮草的情况通常不是这样。在金鱼草的整个个体发育过程中，根组织中的 antirrhinoside 浓度较低且保持不变，而在其唯一的营养繁殖阶段，普通黄花九轮草的根组织中的 antirrhinoside 浓度较高。在萌芽和开花期间，普通黄花九轮草的根组织中的 antirrhinoside 浓度相对于金鱼草的根组织中的 antirrhinoside 浓度下降。在开花期间，普通黄花九轮草的花朵比金鱼草的花朵分配到的 antirrhinoside 和相对生物量要少得多。虽然这些发现与最优防御理论（ODT）一致，但需要进一步研究 antirrhinoside 的分布以及昆虫取食对其他相关物种植物适应性的影响。
