Characteristics of nutrient uptake, photosynthesis, and antioxidative response in a salt-tolerant basil variety

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  • 耐塩性バジルの養分吸収 , 光合成および抗酸化応答に関する特徴
  • Characteristics of nutrient uptake, photosynthesis, and antioxidative response in a salt-tolerant basil variety : Characteristics of salt-tolerant basil
  • － Characteristics of salt-tolerant basil －

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Abstract

The salt tolerance of basil (Ocimum basilicum L.) is attributed to nutrient uptake and an antioxidative response. Here, we investigated nutrient uptake, photosynthesis, chlorophyll fluorescence, and antioxidative response in Sweet (salt-sensitive) and Napoletano (salt-tolerant) basil treated with a control solution or moderate- (50 mM NaCl) or high-salinity (100 mM NaCl) solutions for 13 days to clarify the differences in their salt tolerance mechanisms. Salt tolerance was higher in Napoletano as judged from dry matter production, especially under moderate salinity; Napoletano maintained higher water contents by maintaining higher K contents in leaf blades and accumulating Na in roots. Photosynthetic rate was unaffected in both varieties under moderate salinity, and in Napoletano under high salinity. Electron transport rates were lower in Napoletano than in Sweet, but were not affected by salinity treatments. Catalase activity seemed to be important in both varieties under salinity stress, but did not cause the observed differences in salt tolerance. Malondialdehyde content in Napoletano was always lower than that in Sweet, suggesting that Napoletano has a better antioxidative system.

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  • SAND DUNE RESEARCH

    SAND DUNE RESEARCH 67 (1), 25-37, 2020

    Japanese Society of Sand Dune Research

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