Biologia plantarum 53:378-382, 2009 | DOI: 10.1007/s10535-009-0071-6
Effects of phosphorus and chilling under low irradiance on photosynthesis and growth of tomato plants
- 1 Department of Horticulture, Zhejiang University, Hangzhou, P.R. China
- 2 National Key Laboratory for Sustainable Agricultural and Soil Science, Nanjing, P.R. China
- 3 Key Laboratory of Horticultural Plants Growth, Development and Quality Improvement, Agricultural Ministry of China, Hangzhou, P.R. China
To determine the effects of phosphorus nutrition on chilling tolerance of photosynthetic apparatus, tomato (Lycopersicon esculentum Mill. cv. Kenfengxin 2002) plants were raised under different P contents and subjected to 7 d of chilling at 9/7 °C. After chilling (2 h or 7 d) plant growth, P content in tissue, gas exchange and chlorophyll fluorescence were measured. Decreasing P concentration [P] in the nutrient solution markedly reduced plant growth and the chilled plants exhibiting higher optimum [P] than the unchilled plants. Decreasing [P] significantly decreased light saturated net photosynthetic rate (PNsat), maximum carboxylation velocity of Rubisco (Vcmax), maximum potential rate of electron transport contributed to Rubisco regeneration (Jmax), quantum efficiency of photosystem (PS) 2 (ΠPS2) and O2 sensitivity of PNsat (PSO2) and this trend was especially apparent in chilled plants.
Keywords: chlorophyll fluorescence; inorganic phosphate limitation; net photosynthetic rate; Rubisco; Lycopersicon esculentum
Subjects: carboxylation efficiency; chlorophyll fluorescence; CO2 concentration, internal; cold stress; growth and growth analysis; Lycopersicon esculentum; phosphorus; photon flux density; photosynthetic rate; stomatal conductance; tomato
Received: June 8, 2008; Accepted: February 5, 2009; Published: June 1, 2009 Show citation
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