Effects of cytokinin on photosynthetic gas exchange, chlorophyll fluorescence parameters and antioxidative system in seedlings of eggplant (Solanum melongena L.) under salinity stress

• Autorzy: Wu X. , Zhu Z. , Li X. , Zha D.
• Języki publikacji: EN

Abstrakty

EN

The effects of 6-benzyladenine (6-BA) on plant growth, photosynthetic gas exchange, chlorophyll fluorescence and antioxidant systems of eggplant (Solanum melongena L.) under salt stress were investigated. Eggplant seedlings were exposed to 90 mM NaCl with four levels of 6-BA (5, 10, 20 and 50 µM) for 10 days. 6-BA at lower concentrations increased chlorophyll concentration, the net photosynthetic rate (PN), stomatal conductance (gs), and transpiration rate (E), intercellular CO₂ concentration (Ci) and water use efficiency (WUE), as well as the quantum efficiency of PSII photochemistry (UPSII), photochemical quenching (qp), and decreased non-photochemical quenching (NPQ), while higher concentrations reduced the effects or even exacerbated the occurrence of photosynthetic capacity. The activities of antioxidant enzymes such as superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), and ascorbate peroxidase (APX) increased significantly during salt treatments, and induced the increase of the activities of these enzymes at certain concentrations of 6-BA. 6-BA also reduced significantly malonaldehyde (MDA) contents and O₂⁻ production. It was concluded that 6-BA could alleviate the detrimental effects of salt stress on plant growth by increasing photosynthetic efficiency and enhancing antioxidant enzyme systems in leaves at a proper concentration and of the varying 6-BA concentrations used, the most effective concentration for promoting growth was 10 µM under saline conditions.

• Wydawca: -
• Czasopismo: Acta Physiologiae Plantarum
• Rocznik: 2012
• Tom: 34
• Numer: 6
• Opis fizyczny: p.2105-2114,fig.,ref.

Twórcy

autor

Wu X.

• Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, 201106 Shanghai, China

autor

Zhu Z.

• Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, 201106 Shanghai, China

autor

Li X.

• Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, 201106 Shanghai, China

autor

Zha D.

• Shanghai Key Laboratory of Protected Horticultural Technology, Horticultural Research Institute, Shanghai Academy of Agricultural Sciences, 201106 Shanghai, China

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