Photosynthetica 2006, 44(1):140-142 | DOI: 10.1007/s11099-005-0170-3

Effects of different nitrogen forms on photosynthetic rate and the chlorophyll fluorescence induction kinetics of flue-cured tobacco

H. X. Guo1, W. Q. Liu1,*, Y. C. Shi1
1 Department of Agronomy, Henan Agricultural University, Zhengzhou, Henan, P.R. China

Net photosynthetic rate (P N) of tobacco plants grown with NH4-N as the only N source was the lowest all the times, while P N grown only with NO3-N was the greatest until 22nd day, and P N grown with both NO3-N and NH4-N (1 : 1) was the greatest. Maximal photochemical efficiency of photosystem 2 (PS2), Fv/Fm, and actual quantum yield of PS2 under actinic irradiation (ΦPS2) in plants grown with only NH4-N were greatest at early stage and then decreased and were smaller than those of other treatments. Photochemical quenching coefficient (qP) and non-photochemical quenching coefficient (qNP) in the NH4-N plants were the greatest at all times. Hence excessive NH4-N can decrease not only photochemical efficiency but also the efficiency of utilization of photon energy absorbed by pigments for photosynthesis. Therefore, excessive NH4-N is a hindrance to photosynthesis of flue-cured tobacco. On the other hand, tobacco cultured with an appropriate mixture of NO3-N with NH4-N can sufficiently utilize photon energy and increase the efficiency of energy transformation.

Additional key words: actual quantum yield of PS2; Nicotiana; photochemical and non-photochemical quenching; photosystem 2

Received: December 16, 2004; Accepted: June 7, 2005; Published: March 1, 2006  Show citation

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Guo, H.X., Liu, W.Q., & Shi, Y.C. (2006). Effects of different nitrogen forms on photosynthetic rate and the chlorophyll fluorescence induction kinetics of flue-cured tobacco. Photosynthetica, 44(1), 140-142. doi: 10.1007/s11099-005-0170-3
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