ISHS Acta Horticulturae 459: International Symposium Brassica 97, Xth Crucifer Genetics Workshop
CALCIUM AND NITROGEN ELICITING ALTERATIONS TO GROWTH AND REPRODUCTION OF PLASMODIOPHORA BRASSICAE (CLUBROOT) |
| Authors: | G.R. Dixon, L.V. Page |
| Keywords: | Plasmodiophora brassicae, clubroot, calcium, nitrogen, growth, reproduction |
| Abstract:
Comparisons of the development of Plasmodiophora brassicae growth and reproduction in environments where nitrogen was supplied as nitrate or ammonium ions and in the presence or absence of enhanced concentrations of calcium and / or boron are reported. Growth of primary plasmodia into sporangia in root-hairs was delayed by nitrate-nitrogen, calcium and boron. Field experiments showed that where calcium nitrate fertiliser was applied in comparison with ammonium nitrate there were significant reductions in symptom formation and increases in yield. Boron enhanced the effects of calcium nitrate. Preliminary experiments with root systems split between different nutrient solutions tended to indicate that there was no transfer of effect through the plant from one environment to another. | |
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