Effects of phosphorus and chilling under low irradiance on photosynthesis and growth of tomato plants
2009
Zhou, Y.H.,Zhejiang Univ., Hangzhou (China). Dept. of Horticulture | Wu, J.X.,Zhejiang Univ., Hangzhou (China). Dept. of Horticulture | Zhu, L.J.,Zhejiang Univ., Hangzhou (China). Dept. of Horticulture | Shi, K.,Zhejiang Univ., Hangzhou (China). Dept. of Horticulture | Yu, J.Q.,Zhejiang Univ., Hangzhou (China). Dept. of Horticulture
To determine the effects of phosphorus nutrition on chilling tolerance of photosynthetic apparatus, tomato (cv. Kenfengxin 2002) plants were raised under different P contents and subjected to 7 d of chilling at 9/7 deg C. After chilling (2 h or 7 d) plant growth, P content in tissue, gas exchange and chlorophyll fluorescence were measured. Decreasing P concentration in the nutrient solution markedly reduced plant growth. The chilled plants exhibited higher optimum P conc. than the unchilled plants. Decreasing P conc. significantly decreased light saturated net photosynthetic rate (PNsat), maximum carboxylation velocity of Rubisco, maximum potential rate of electron transport contributed to Rubisco regeneration, quantum efficiency of photosystem 2 and O2 sensitivity of PNsat. This trend was especially apparent in chilled plants.
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