Resistance and response of <Emphasis Type="Italic">Pinus pinaster</Emphasis> seedlings to <Emphasis Type="Italic">Hylobius abietis</Emphasis> after induction with methyl jasmonate |
| |
Authors: | Luis Sampedro Xoaquín Moreira Rafael Zas |
| |
Institution: | 1.Centro de Investigación Forestal de Lourizán - Unidad Asociada MBG-CSIC,Pontevedra,Spain;2.Misión Biológica de Galicia (CSIC),Pontevedra,Spain |
| |
Abstract: | Experimental induction of plant chemical defences with methyl jasmonate (MeJa) is a valuable tool for understanding the ecology
of plant defensive responses. However, few studies have examined whether MeJa-induced defences in conifers are effective against
insect herbivores. We studied, in 17 half-sib Pinus pinaster families, (i) the effect of MeJa application on plant growth and on the induction of diterpenoid resin in different sections
of the stem; (ii) whether MeJa-induced defences increase the resistance of living pine juveniles against the large pine weevil
Hylobius abietis in an in vivo bioassay and (iii) the induction of resin content after weevil wounding. Resin concentration was greater in
the upper section of the stem compared with basal sections in both MeJa-induced and non-induced seedlings. Sixty days after
MeJa application, treated plants showed 40% greater resin content all along the stem, but reduced height growth compared to
control plants. MeJa-induction was effective against the pine weevil, as induced seedlings were 21% less damaged than control
plants. Wounding activity by H. abietis produced a strong local defensive response after 48 h, where resin concentration was double that observed in the basal and
apical sections not exposed to the insects. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|