Photosynthetica 2015, 53(1):157-160 | DOI: 10.1007/s11099-015-0090-9

Fertilization regimes under hot conditions alter photosynthetic response of bean plants

I. A. Hassan1,2,*, H. M. Abou Zeid2, W. Taia2, N. S. Haiba3, A. Zahran4, R. H. Badr2, R. A. El Dakak2, E. A. Shalaby5
1 Air Pollution Laboratory (APL), Centre of Excellence in Environmental Studies (CEES), King Abdulaziz University, Jeddah, Saudi Arabia
2 Department of Botany, Faculty of Science, Alexandria University, El Shatby, Alexandria, Egypt
3 Department of Chemistry and Physics, Faculty of Education, Alexandria University, Alexandria, Egypt
4 Department of Evaluation of Natural Sources, Institute of Environmental Studies and Research, University of Sadat City, Sadat City, Egypt
5 Department of Environmental Studies, Institute of Graduate Studies and Research, Alexandria University, Alexandria, Egypt

We examined the effects of foliar application of various nitrogen (urea) concentrations on gas-exchange and chlorophyll (Chl) fluorescence characteristics in bean plants treated by heat stress (42/30°C, day/night temperatures). Heat stress caused reductions in contents of Chl a, Chl b, and in maximum photochemical efficiency of PSII by 13, 20, and 27%, respectively, regardless of the N treatment. However, N fertilization caused significant increases in these parameters, especially at higher N concentrations. The net photosynthetic rate and stomatal conductance were enhanced by 32, 60, and 69% and by 25, 88, and 100% due to addition of 5, 10, and 15 mM N, respectively. However, gas-exchange parameters were reduced by 24% due to heat stress. N fertilization alleviated adverse effects of heat stress.

Keywords: heat stress; nitrogen fertilization; photosynthetic performance; Phaseolus vulgaris L

Received: April 30, 2014; Accepted: September 12, 2014; Published: March 1, 2015Show citation

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Hassan, I.A., Zeid, H.M., Taia, W., Haiba, N.S., Zahran, A., Badr, R.H., Dakak, R.A., & Shalaby, E.A. (2015). Fertilization regimes under hot conditions alter photosynthetic response of bean plants. Photosynthetica53(1), 157-160. doi: 10.1007/s11099-015-0090-9.
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