Lodgepole pine provenances differ in chemical defense capacities against foliage and stem diseases

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From: Canadian Journal of Forest Research(Vol. 40, Issue 12)
Publisher: NRC Research Press
Document Type: Report
Length: 6,451 words
Lexile Measure: 1770L

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Abstract :

Maximization of lodgepole pine (Pinus contorta Douglas ex Louden var. latifolia Engelm. ex S. Watson) growth in a future climate with increased pest activity requires an understanding of the natural variability of quantitative resistance to disease. Foliar and bark secondary metabolites from different lodgepole pine provenances (populations) were quantified and correlated with severity of foliar diseases caused by Lophodermella spp. (Lophodermella concolor (Dearn.) Darker or Lophodermella montivaga Petre.) or Elytroderma deformans (Wier) Darker and bark diseases caused by Elytroderma or Endocronartium harknessii (J.P. Moore) Y. Hiratsuka. Greater foliar concentrations of lignin, tannins, and some phenolics were associated with increased resistance to single or multiple foliar pathogens. Bark secondary metabolites levels were generally unassociated with resistance to bark diseases. Provenances appearing to originate in ecosystems where lodgepole pine are not the dominant species generally were more susceptible to foliar diseases and had less foliar defenseassociated compounds than trees from areas where pines were the dominant species, yet clear trends proved to be elusive. Regardless, pine provenances with greater foliar levels of identified defense-associated compounds should be preferred seed sources for replanting forests in areas in which foliar disease is expected to be increasingly prevalent. Resume: Il faut connaitre la variabilite naturelle de la resistance quantitative aux maladies pour maximiser la croissance du pin tordu latifolie (Pinus contorta Douglas ex Louden var. latifolia Engelm. ex S. Watson) car les conditions climatiques devraient, dans l'avenir, entrainer une augmentation de l'activite des ravageurs. Les metabolites secondaires des feuilles et de l'ecorce de differentes provenances (populations) de pin tordu latifolie ont ete quantifies et correles avec la severite des maladies de feuilles causees par Lophodermella spp. (Lophodermella concolor (Dearn.) Darker ou Lophodermella montivaga Petre.) ou Elytroderma deformans (Wier) Darker et des chancres causes par Elytroderma ou Endocronartium harknessii (J.P. Moore) Y. Hiratsuka. Des concentrations plus elevees de lignine, de tannins et de certains composes phenoliques etaient associes a` une plus grande resistance a` un ou plusieurs pathoge`nes foliaires. Le niveau de metabolites secondaires dans l'ecorce n'etait pas generalement associe a la resistance aux chancres. Il semble que les provenances associe es a des ecosystemes ou le pin tordu latifolie n'est pas l'espece dominante etaient generalement plus sensibles aux maladies de feuilles et avaient moins de composes foliaires relies aux mecanismes de defense que les arbres qui provenaient des zones ou les pins etaient l'espece dominante; mais il n'y avait pas de tendances nettes. Malgre tout, les provenances de pin avec les niveaux les plus eleves de composes connus associes aux mecanismes de defense dans les feuilles devraientetre les sources preferees de graines pour replanter les forets dans les zones ou les maladies de feuilles pourraientetre de plus en plus repandues. [Traduit par la Redaction]

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Gale Document Number: GALE|A250825135