Herbivore-induced plant volatiles mediate defense regulation in maize leaves but not in maize roots.

Autor: van Doan C; Institute of Plant Sciences, University of Bern, Bern, Switzerland.; Oeschger Centre for Climate Change Research (OCCR), University of Bern, Bern, Switzerland., Züst T; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Maurer C; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Zhang X; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Machado RAR; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Mateo P; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Ye M; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Schimmel BCJ; Institute of Plant Sciences, University of Bern, Bern, Switzerland., Glauser G; Neuchâtel Platform of Analytical Chemistry, Université de Neuchâtel, Neuchâtel, Switzerland., Robert CAM; Institute of Plant Sciences, University of Bern, Bern, Switzerland.; Oeschger Centre for Climate Change Research (OCCR), University of Bern, Bern, Switzerland.
Jazyk: angličtina
Zdroj: Plant, cell & environment [Plant Cell Environ] 2021 Aug; Vol. 44 (8), pp. 2672-2686. Date of Electronic Publication: 2021 Apr 06.
DOI: 10.1111/pce.14052
Abstrakt: Plant leaves that are exposed to herbivore-induced plant volatiles (HIPVs) respond by increasing their defenses, a phenomenon referred to as priming. Whether this phenomenon also occurs in the roots is unknown. Using maize plants, Zea mays, whose leaves respond strongly to leaf HIPVs, we measured the impact of belowground HIPVs, emanating from roots infested by the banded cucumber beetle, Diabrotica balteata, on constitutive and herbivore-induced levels of defense-related gene expression, phytohormones, volatile and non-volatile primary and secondary metabolites, growth and herbivore resistance in roots of neighbouring plants. HIPV exposure did not increase constitutive or induced levels of any of the measured root traits. Furthermore, HIPV exposure did not reduce the performance or survival of D. balteata on maize or its ancestor teosinte. Cross-exposure experiments between HIPVs from roots and leaves revealed that maize roots, in contrast to maize leaves, neither emit nor respond strongly to defense-regulating HIPVs. Together, these results demonstrate that volatile-mediated defense regulation is restricted to the leaves of maize. This finding is in line with the lower diffusibility of volatiles in the soil and the availability of other, potentially more efficient, information conduits below ground.
(© 2021 The Authors. Plant, Cell & Environment published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
Externí odkaz: