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Winter wheat varieties were studied for frost resistance under different artificial conditions. The relationships between important environmental factors, such as temperature, light, water, atmospheri...c CO_2 concentration and hardening period were investigated. Under artificial conditions the development of a state of hardiness in winter wheat varieties depends to a great extent on a gradual decrease in temperature. A gradual rise in temperature, irrespective of whether it was combined with decreasing or increasing daylength and illumination intensity, always had an unfavourable effect. As the result of varying soil water contents, there were significant differences in the average killed plant rate, which dropped in the case of low soil moisture content and rose at a higher moisture content. An increase in the atmospheric CO_2 concentration had a beneficial effect on the cold hardening process. It was found that the wheat varieties achieved a maximum level of hardening on the 50th day of hardening. The % survival gradually increased from the 10th to the 50th day, after which a gradually decreasing tendency was observed. Based on the results described here, it can be seen that frost tolerance is always a relative term. The development, maintenance and termination of frost tolerance are determined by both genetic and environmental factors.続きを見る
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Mendeley出力
KJ00004506850