Organic and inorganic nitrogen effects on spore production and mycelial growth of Neonectria ditissima in vitro

  • Rebecca E. Campbell Plant & Food Research
  • Amandine Touron Ecole Nationale Supérieure d'Agronomie et des Industries Agroalimentaires
  • Monika Walter Plant & Food Research

Abstract

Nitrogen (N) is known to influence the growth of Neonectria ditissima (N.d.), the causal organism of European canker. In vitro, inorganic N inhibits conidia germination at N concentrations above 0.2 mol/L while, in planta, foliar urea application increased disease expression of leaf scar wounds up to nine-fold. The influence of organic and inorganic N sources on mycelial growth and spore production of N.d. in vitro was investigated. Four organic and six inorganic N sources were tested on agar at concentrations of N between 0 and 0.2 mol/L, with 3 different N.d. isolates. Spore production was generally increased by the addition of low concentrations of N, with varying results at higher concentrations dependent on the N source; however, this also differed among N.d. isolates. Spore production was generally incompletely inhibited at the higher N concentrations tested. However, germination from the resulting conidia decreased, possibly due to morphological changes to the spores. Mycelial growth generally decreased with the addition of N. Understanding the N effect in planta will be further complicated by the physiological plant-N and plant-pathogen interaction processes.

Published
2018-07-30
How to Cite
Campbell, R., Touron, A., & Walter, M. (2018). Organic and inorganic nitrogen effects on spore production and mycelial growth of Neonectria ditissima in vitro. New Zealand Plant Protection, 71, 354. https://doi.org/https://doi.org/10.30843/nzpp.2018.71.214
Section
Vol 71 Poster Abstracts 2018