Exploiting jasmonate-induced responses for field protection of conifer seedlings against a major forest pest, Hylobius abietis

Zas, Rafael; Björklund, Niklas; Nordlander, Göran; Cendán, César; Hellqvist, Claes; Sampedro, Luís

doi:10.1016/j.foreco.2013.11.014

Cited by 58 publications

(118 citation statements)

References 57 publications

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Section: Discussionmentioning

confidence: 99%

“…Jasmonates are known to induce physical and chemical defences in conifers, and MeJA application was shown to elevate concentrations of terpene and phenolic defence chemicals in radiata pine and to induce resistance against D. sapinea (Gould et al 2009) and also the large pine weevil Hylobius abietis (L.) (Zas et al 2014). Apical growth of MeJA-treated seedlings was less than that of non-inoculated seedlings during the post-inoculation period, although this may not be attributable solely to disease because MeJA is known to cause a transient reduction in seedling growth (Gould et al 2008;Zas et al 2014). Aside from crooking of the growing tip and needle death, infection of radiata pine with C. acutatum is also characterized by physiological symptoms including thickening of the stem and slowing down of apical growth (Nair and Corbin 1981).…”

Section: Discussionmentioning

confidence: 99%

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Enhancing resistance in Pinus radiata seedlings to terminal crook (Colletotrichum acutatum) using methyl jasmonate and ultraviolet‐C radiation

et al. 2015

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Colletotrichum acutatum is a fungal pathogen that causes terminal crook disease in radiata pine (Pinus radiata) seedlings in New Zealand forest nurseries. Symptoms of infection include malformation or death of the growing tip and a stiffening and thickening of the stem. Although the disease can be managed effectively using fungicides, the New Zealand forest industry is interested in alternative control options such as induced resistance. The aim of this study was to evaluate spray application of chitosan (1.4 g/l) or 2.25 mM methyl jasmonate (MeJA) and irradiation with UV-C (2.16 kJ/m 2 ) for their potential to induce resistance to terminal crook. The treatments were applied to 4-month-old seedlings at 1 week before pathogen inoculation. By the end of the experimental period (42 days after inoculation), there was 80% disease incidence in the controls, with 48% of seedlings exhibiting severe terminal crook symptoms. The most effective treatment (p < 0.05) was MeJA with 16% disease incidence and none with severe symptoms. UV-C also significantly (p < 0.05) reduced infection with 52% incidence and 20% of seedlings exhibiting severe symptoms. Chitosan did not reduce disease incidence (72%) compared with the control (80%) but did significantly reduce (p < 0.05) disease severity with 28% exhibiting severe symptoms. MeJA was the only treatment that significantly (p < 0.05) reduced the detrimental effects of infection on seedling apical growth and stem diameter. To our knowledge, this is the first report demonstrating the potential for MeJA and UV-C to control terminal crook in radiata pine.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Enhancing resistance in Pinus radiata seedlings to terminal crook (Colletotrichum acutatum) using methyl jasmonate and ultraviolet‐C radiation

et al. 2015

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“…These prophylactic measures are, however, relatively expensive to apply. The need for alternative methods to reduce damage by this pest remains high, motivating research initiatives focused on, e.g., the use of chemical elicitors to improve seedling resistance (Fedderwitz et al 2016;Zas et al 2014) or biological control of the pine weevil by nematodes (Williams et al 2013). …”

Section: Communicated By F Isikmentioning

confidence: 99%

Genetic variation in resistance of Norway spruce seedlings to damage by the pine weevil Hylobius abietis

Zas

Björklund

Sampedro

et al. 2017

Tree Genetics & Genomes

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Regeneration of northern conifer forests is commonly performed by reforestation with genetically improved materials obtained from long-term breeding programs focused on productivity and timber quality. Sanitary threats can, however, compromise the realization of the expected genetic gain. Including pest resistance traits in the breeding programs may contribute to a sustainable protection. Here we quantified the variation in different components of resistance of Norway spruce to its main pest, the pine weevil Hylobius abietis. We followed insect damage in two large progeny trials (52 openpollinated families with 100-200 individuals per family and trial) naturally infested by the pine weevil. Pine weevils damaged between 17 and 48% of the planted seedlings depending on the trial and year, and mortality due to weevil damage was up to 11.4%. The results indicate significant genetic variation in resistance to the pine weevil, and importantly, the variation was highly consistent across trials irrespective of contrasting incidence levels. Individual heritability estimates for the different components of seedling resistance were consistently low, but family heritabilities were moderate (0.53 to 0.81). While forward selections and breeding for higher resistance seem not feasible, backwards selections of the best parent trees emerge as a putative alternative to reduce weevil damage. A positive genetic correlation between early growth potential and probability of being attacked by the weevil was also observed, but the relationship was weak and appeared only in one of the trials. Overall, results presented here open the door to a new attractive way for reducing damage caused by this harmful pest.

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“…These approaches include the selection of more resistant material in breeding programmes (Zas et al 2017) and to enhance the defence of seedlings by methyl jasmonate treatment in the nursery (Zas et al 2014;Fedderwitz et al 2016;Lundborg et al 2016a;Lundborg et al 2016b). Thus, planting regeneration areas with less palatable seedlings should result in less damage occurring to planted seedlings; instead, feeding may be redirected to alternative food sources, such as bark of branches and roots of mature conifer trees, where no economic harm is caused.…”

Section: Discussionmentioning

confidence: 99%

“…This question becomes especially relevant as new seedling protection methods involve the development of better-defended seedlings by decreasing their palatability (Holopainen et al 2009;Zas et al 2014). For example, seedlings treated with methyl jasmonate -a naturally occurring plant hormone -are less likely to be fed on if other food sources are available (Zas et al 2014;Fedderwitz et al 2016). This protective effect, however, tends to disappear in a no-choice situation (Fedderwitz et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Does the pine weevil (<i>Hylobius abietis</i>) prefer conifer seedlings over other main food sources?

Fedderwitz¹,

Björklund²,

Ninkovic³

et al. 2018

Silva Fenn.

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Does the pine weevil (Hylobius abietis) prefer conifer seedlings over other main food sources?Fedderwitz F., Björklund N., Ninkovic V., Nordlander G. (2018). Does the pine weevil (Hylobius abietis) prefer conifer seedlings over other main food sources? Silva Fennica vol. 52 no. 3 article id 9946. 9 p. https://doi.org/10.14214/sf.9946 Highlights• Adult pine weevils feed on seedlings and mature conifers, but cause economic damage only on seedlings.• Their feeding preferences for branches and roots over seedlings were tested in a laboratory experiment.• The only clear preference was for Norway spruce roots.• Results support new approaches of seedling protection attempting to redirect pine weevils from planted seedlings to other food sources. AbstractAdult pine weevils (Hylobius abietis (L.)) feed on the tender bark of branches and roots of mature conifer trees and on the stem bark of conifer seedlings. Their feeding on mature trees does not cause any economic damage, but their feeding on planted seedlings is so devastating that the pine weevil is considered one of the most important forest pest insects in Europe. We asked whether the pine weevil prefers seedlings over other regularly utilized food sources. This question is of particular interest because new approaches to seedling protection are based on decreasing any preference for seedlings by using less palatable plants or by enhancing their defence (by genetic selection or by methyl jasmonate treatment). In a laboratory choice experiment we tested pine weevil feeding preferences for seedlings compared with branches and roots from mature trees (separately for Norway spruce and Scots pine). Pine weevils preferred roots, but not branches, of Norway spruce over seedlings of the same species. With Scots pine there were no clear preferences, but the weevils showed a tendency to prefer roots over seedlings. These results provide support for seedling protection approaches that attempt to redirect pine feeding from planted seedlings to other food sources.

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Exploiting jasmonate-induced responses for field protection of conifer seedlings against a major forest pest, Hylobius abietis

Cited by 58 publications

References 57 publications

Enhancing resistance in Pinus radiata seedlings to terminal crook (Colletotrichum acutatum) using methyl jasmonate and ultraviolet‐C radiation

Enhancing resistance in Pinus radiata seedlings to terminal crook (Colletotrichum acutatum) using methyl jasmonate and ultraviolet‐C radiation

Genetic variation in resistance of Norway spruce seedlings to damage by the pine weevil Hylobius abietis

Does the pine weevil (<i>Hylobius abietis</i>) prefer conifer seedlings over other main food sources?

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