期刊
JOURNAL OF EXPERIMENTAL BOTANY
卷 61, 期 15, 页码 4437-4447出版社
OXFORD UNIV PRESS
DOI: 10.1093/jxb/erq246
关键词
Chemical defence; conifer; constitutive defences; genetic variation; induced defences; leaf volatile terpenes; methyl jasmonate; phenotypic plasticity; Pinus pinaster
资金
- Spanish Instituto Nacional de Investigacion y Tecnologia Agraria y Agroalimentaria [INIA-RTA07-100]
- Spanish Agency of Science and Technology [CGL2006-04025/BOS, CGL2010-17172, CSD2008-00040, AGL2010-18724, PSE310000]
- Catalonian Government [SGR 2009-1458]
Oleoresin produced and stored in pine tree leaves provides direct resistance to herbivores, while leaf volatile terpenes (LVT) in the resin are also powerful airborne infochemicals. Resin concentration and profile show considerable spatial and temporal phenotypic variation within and among pine populations. LVT biochemistry is known to be under genetic control, and although LVT should be plastic to diverse abiotic and biotic environmental factors such as nutrient availability and herbivore attack, little is known about their relative contributions and interactive effects. The aim of this paper was to clarify whether reduced phosphorus availability could increase the LVT concentration and affect the expression of herbivore-derived induced defences, and how plasticity would contribute to the phenotypic variation of LVT. The constitutive and methyl-jasmonate (MeJa) induced LVT concentration and profile were analysed in 17 half-sib Pinus pinaster families growing under two levels of P-availability (complete and P-limited fertilization). Individual terpene concentrations showed large additive genetic variation, which was more pronounced in the control than in MeJa-induced pines. MeJa application did not affect the LVT concentration, but significantly modified the LVT profile by depleting the alpha-pinene content and reducing the sesquiterpene fraction. Low P-availability strongly reduced plant growth and foliar nutrient concentrations, but did not affect LVT concentration and profile, and did not interact with MeJa-induction. Results indicate a strong homeostasis of LVT concentration to P-availability, and minor changes in the LVT profile due to MeJa-induction. Genetic variation appears to be the main source of phenotypic variation affecting the LVT concentration in this pine species.
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