Sammendrag
Everyone who has examined the problem is surprised that Nordic countries are so limited in the variety of landscape plants that can be used. This situation becomes even more difficult to understand whenone considers the fact that areas in the Northern USA such as Wisconsin and Minnesota which have much colder winters than most of Scandinavia use several types of landscape plants that cannot survive in Nordic areas. Over the years, several explanations have been prposed to account for the severity of Nordic environments for plant survival. A demonstrated process involves the fact that imported landscape plants are often poorly adapted in terms of their daylength requirements for hardening in the fall. Without sufficient hardening, plants are overly sensitive to frost during the fall. On the other hand, there are probably several other processes that are harmful for plants in Nordic regions. This presentation will focus on the idea that chilling contributes significantly to plant stress in Scandinavia, especially during the critical periods of transition during fall and spring when cool days are accompanied by high light intensities. These conditions lead to imbalances in photosynthesis with a strong potential for the generation of reactive oxygen species (ROS), leading to oxidative stress. We have used Arabidopsis as a model to identify new determinants involved in chilling stress tolerance. We will describe studies leading to the identification of over 40 genes involved.
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