Mihaliak Charles A, Lincoln David E
Department of Biology, University of South Carolina, 29208, Columbia, SC, USA.
Oecologia. 1985 Jun;66(3):423-426. doi: 10.1007/BF00378309.
Rosettes of Heterotheca subaxillaris were grown at four levels of nitrate. Individual leaf volatile mono- and sesquiterpene content, leaf nitrogen content, and root and shoot dry weight were measured on individual leaves every two weeks for 18 weeks. Rosettes with the highest nitrate availability had 2.2-fold greater leaf nitrogen levels compared to plants with the lowest availability. As nitrate availability became increasingly limited, carbon allocation to both volatile leaf terpenes and root growht increased. Leaf mono- and sesquiterpene content was greatest in the young leaves of individuals growing at the lowest nitrate availability conditions. Higher levels of carbon-based herbivore-deterring chemicals in nitrate-limited plants may increase net productivity through retention of nitrogen that would otherwise be lost to herbivory.
腋生异苞菊莲座丛在四种硝酸盐水平下生长。每两周对单株叶片的挥发性单萜和倍半萜含量、叶片氮含量以及根和地上部干重进行测量，持续18周。与硝酸盐可利用性最低的植株相比，硝酸盐可利用性最高的莲座丛叶片氮水平高2.2倍。随着硝酸盐可利用性变得越来越有限，分配到挥发性叶片萜类化合物和根系生长的碳增加。在硝酸盐可利用性最低条件下生长的个体的幼叶中，叶片单萜和倍半萜含量最高。硝酸盐受限植株中较高水平的碳基食草动物威慑化学物质可能通过保留氮来提高净生产力，否则这些氮会因食草作用而损失。
