biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 52:113-116, 2008 | DOI: 10.1007/s10535-008-0021-8

Effects of foliar application of nitrogen on the photosynthetic performance and growth of two fescue cultivars under heat stress

W. Y. Zhao1,3, S. Xu2, J. L. Li1,*, L. J. Cui1, Y. N. Chen3, J. Z. Wang1
1 School of Life Science, Nanjing University, Nanjing, P.R. China
2 Institute of Applied Ecology, Chinese Academy of Science, Shenyang, P.R. China
3 Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi, P.R. China

The effects of nitrogen fertilization on the growth, photosynthetic pigment contents, gas exchange, and chlorophyll (Chl) fluorescence parameters in two tall fescue cultivars (Festuca arundinacea cv. Barlexas and Crossfire II) were investigated under heat stress at 38/30 °C (day/night) for two weeks. Shoot growth rate of two tall fescue cultivars declined significantly under heat stress, and N supply can improved the growth rates, especially for the Barlexas. Chl content, leaf net photosynthetic rate, stomatal conductance, water use efficiency, and the maximal efficiency of photosystem 2 photochemistry (Fv/Fm) also decreased less under heat stress by N supply, especially in Crossfire II. Moreover, cultivar variations in photosynthetic performance were associated with their different response to heat stress and nitrogen fertilization, which were evidenced by shoot growth rate and photosynthetic pigment contents.

Keywords: chlorophyll fluorescence parameters; Festuca arundinacea; intercellular CO2 concentration; stomatal conductance; tall fescue; transpiration; urea; water use efficiency
Subjects: carotenoids; chlorophyll a,b; chlorophyll fluorescence; CO2 concentration, internal; cultivar and genotype differences; Fesctuca arundinacea; gas exchange; heat stress, high temperature; nitrogen supply; stomatal conductance; tall fescue; temperature, high; transpiration rate; water use efficiency

Received: March 6, 2006; Accepted: September 20, 2006; Published: March 1, 2008  Show citation

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Zhao, W.Y., Xu, S., Li, J.L., Cui, L.J., Chen, Y.N., & Wang, J.Z. (2008). Effects of foliar application of nitrogen on the photosynthetic performance and growth of two fescue cultivars under heat stress. Biologia plantarum, 52(1), 113-116. doi: 10.1007/s10535-008-0021-8
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