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Gewählte Publikation:

Keutgen, AJ; Noga, G; Pawelzik, E.
(2005): Cultivar-specific impairment of strawberry growth, photosynthesis, carbohydrate and nitrogen accumulation by ozone
ENVIRON EXP BOT. 2005; 53(3): 271-280. FullText FullText_BOKU

In a 2-year study, fruiting plants of strawberry (Fragaria x ananassa Duch.) cv. `Koronaxxx and `Elsantaxxx were exposed for 2 months to 78 ppb ozone on average or filtered air without ozone in controlled environment chambers. Plant growth, photosynthesis, carbohydrate accumulation, and macronutrient concentrations were investigated in order to demonstrate cultivar-specific differences in the ozone sensitivity of `Koronaxxx and `Elsantaxxx on the whole plant level. Moreover, the hypothesis was tested whether properties of the root system in strawberry were involved in ozone tolerance, for example, the rootsxxx ability to store or make available carbohydrates and their capacity to secure plantsxxx supply with nitrogen during a stress situation. In strawberry, ozone reduced leaf area by reducing leaf number. Moreover, specific leaf area (SLA) and relative leaf water content were reduced. Net photosynthesis was only slightly impaired, but activity of Rubisco and chlorophyll content in older leaves of cv. `Elsantaxxx were significantly reduced. The most important, indirect impairment of photosynthesis was the reduction of plantsxxx total leaf area, which resulted in a decrease in plant biomass. The reduction of root biomass, the root/shoot ratio, and also the distribution of carbohydrates indicated a partitioning priority of the shoot at expense of the root system. Cultivar `Elsantaxxx was characterized by significantly lower carbohydrate levels in ozone-exposed leaves, whereas levels remained fairly stable in `Koronaxxx leaves. In addition, nitrogen concentrations in leaves and roots decreased significantly in `Elsantaxxx, not in `Koronaxxx. The reduced nitrogen concentration in leaves may be related with the more distinct reduction in Rubisco activity and chlorophyll content in older leaves of `Elsantaxxx. ***COPY; 2004 Elsevier B.V. All rights reserved.
Autor*innen der BOKU Wien:
Keutgen Anna
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