Summary
Plants adapted to a northern climate respond to autumn conditions with cold hardening. Cold hardened plants have higher resistance to freezing and other abiotic winterstress factors than unhardened ones, but also increased resistance to snow mould fungi. This is regarded as a natural adaptation to a sub-arctic climate. Cold hardening also affects resistance to other fungal diseases, as rust, powdery mildew and leaf spot. The effect of hardening is similar to resistance induced by microorganisms. Biochemical studies have shown increased sucrose content as well as enhanced invertase activity after cold hardening of timothy and reed canary-grass. Mobilisation of sucrose in the plants may be of importance for both resisting fungal invasion and freezing injury. Cold hardened spring barley contained RNA-species and PR-proteins described from mildew-inoculated plants, amongst them a putative chitinase. Cold induced gene expression have several similarities to the gene expression in plants exhibiting microbial induced disease resistance.
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Tronsmo, A.M. (1994). Cold hardening — a physiological mechanism for resisting biotic as well as abiotic stress factors. In: Rognli, O.A., Solberg, E., Schjelderup, I. (eds) Breeding Fodder Crops for Marginal Conditions. Developments in Plant Breeding, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0966-6_32
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DOI: https://doi.org/10.1007/978-94-011-0966-6_32
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