| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 487.84 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Key message Migration ability of the PWN through
wood branch tissues of adult Maritime pine trees significantly
differed among Iberian provenances and this
variation was related to differences in anatomical and
chemical defensive traits.
Abstract The pinewood nematode or pine wilt nematode
(PWN; Bursaphelenchus xylophilus) is one of the most
dangerous threats to European coniferous forests, especially
for the susceptible Maritime pine (Pinus pinaster), a
valuable forest resource in South Western Europe. The
PWN is vectored by beetles of the genus Monochamus (Coleoptera, Cerambycidae) and once inoculated in healthy
branches, it quickly migrates downward to the main trunk
through the resin canal system. Therefore, the anatomy of
the resin canal system may modulate its migration and
proliferation rates. Using material from nine Maritime pine
Iberian provenances established in a common garden trial,
we investigated whether these provenances differed in their
(1) resin canal anatomy, (2) concentration of chemical
defences (non-volatile resin and total polyphenolics) in
stems and (3) ability of the PWN to migrate through the
pine woody tissues in ‘in vitro’ bioassays. Whether variation
in anatomical and chemical defensive traits relates to
differences in PWN migration across populations was also
investigated. Significant intraspecific variation in anatomical
and chemical defensive traits and in nematode
migration rates through pine tissues was observed. Moreover,
the variation in nematode migration rate among pine
provenances was related to differences in both anatomical
and chemical features. Overall, this study highlights the
role of plant genetics in the development of defensive traits
against this harmful coniferous pest. The observed intraspecific
variation should be taken into account when considering
breeding as a strategy to provide areas of high risk
of PWN with resistant genetic material.
Description
Keywords
Anatomical defences Nematode migration rate Non-volatile resin Pine wilt disease (PWD) Polyphenolics Population differentiation Resin canals
Citation
ZAS, Rafael …[et al.] - Intraspecific variation of anatomical and chemical defensive traits in Maritime pine (Pinus pinaster) as factors in susceptibility to the pinewood nematode (Bursaphelenchus xylophilus). Trees. ISSN 1432-2285. Published on-line December (2014), 11 p.
Publisher
Springer