Effects of elevated CO_2 concentration and salinity stress on biomass production, photosynthesis, and oxidative stress in tomato plants

TAKAGI Mizuki, SASAKI Sachiko, TOYAMA Shinichiro, KANAI Syunsuke, SANEOKA Hirofumi, FUJITA Kounosuke

doi:10.20710/dojo.79.3_291

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高CO_2濃度および塩ストレスがトマトの生育、光合成および酸化ストレスに与える影響
コウ CO2 ノウドオヨビシオストレスガトマトノセイイクコウゴウセイオヨビサンカストレスニアタエルエイキョウ

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Abstract

Tomato (Solanum lycopersicum L. cv. 'Momotarou') plants were grown in pots inside a greenhouse. The adverse effects of salinity stress under elevated atmospheric CO_2 on biomass production, the apparent photosynthetic rate, and activities of antioxidative enzymes during the vegetative growth period were examined. Although salinity stress severely decreased biomass of all plant organs, this reduction was alleviated by elevated CO_2. The salinity treatment also depressed the apparent photosynthetic rate, but the impact of salinity stress on photosynthesis was alleviated under elevated CO_2. Catalase activity in leaves was increased by the salinity treatment, but was decreased by elevated CO_2. In contrast, APX activity was increased by salinity but was not affected by elevated CO_2. These results suggest that salinity stress suppressed vegetative growth in tomato plants, but that the adverse effect was alleviated under elevated CO_2 due to elevation of source activity in leaves at high source/sink ratios.

Journal

Japanese Journal of Soil Science and Plant Nutrition

Japanese Journal of Soil Science and Plant Nutrition 79 (3), 291-297, 2008

Japanese Society of Soil Science and Plant Nutrition

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