Effect of low boron supply in turnip plants under drought stress |
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| Authors: | R Hajiboland and F Farhanghi |
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| Institution: | (1) Faculty of Forestry, University of Joensuu, P.O. Box 111, 80101 Joensuu, Finland;(2) Department of Forest Resource Management, University of Helsinki, P.O. Box 27, 00014 Helsinki, Finland;(3) Present address: Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, 40351 Jyväskylä, Finland |
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| Abstract: | Turnip (Brassica rapa L.) plants were grown in Perlite with low (< 2.5 μM) or adequate (25 μM) boron supply under well-watered and drought conditions for 12 weeks. Dry mass of
leaves and roots was reduced under drought by about 61 and 56 % in plants supplied adequately with B, while up to 84 and 74
% under B starvation. Drought reduced B content by about 70 and 82 % for B-sufficient and B-deficient plants, respectively.
According to the chlorophyll fluorescence parameters, the photosynthesis processes conserved their normal activities under
low B supply in well-watered plants, while a serious damage to photosystem 2 occurred under drought stress. Stomatal limitation
was the most important cause for a 17 % lower net photosynthetic rate (PN) of drought stressed B-sufficient plants. In B-deficient plants, however, both stomatal and non-stomatal limitations were
involved in 53 % reduction of PN. Low B supply reduced strongly leaf water potential. |
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