Inducible defense provided by Neotyphodium to Lolium arundinacea and lolium pratense: an ecological and molecular approach
DOI:
https://doi.org/10.33584/rps.13.2006.3106Abstract
Plants have evolved a range of responses to herbivory ranging from tolerance to both inducible and constitutive chemical defenses. Previous research has shown lolines produced by Neotyphodium coenophialum are inducible by host damage. In this paper, we examined whether this inducibility can also be caused by damage from an invertebrate herbivore and whether this phenomenon also occurs in N. uncinatum. We also investigated whether changes in gene expression for lolC, a gene in the loline biosynthesis pathway, accompanies changes in defense response. For N. coenophialum, both mechanical and herbivore damage had a negative effect on subsequent aphid herbivores. For N. uncinatum, damage did not cause an increase in defense, although there was an increase in endophyte-free hosts. Relative expression of lolC varied significantly over time, and between damage types for N. uncinatum with herbivore damaged plants having a lower relative lolC -1 expression. Keywords: Neotyphodium, gene expression, inducible defense, loline, lolC
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