, 46:143 | Cite as

Specific leaf area, leaf nitrogen content, and photosynthetic acclimation of Trifolium repens L. seedlings grown at different irradiances and nitrogen concentrations

  • H. An
  • Z. -P. Shangguan
Brief Communication


Clover seedlings were grown at different nitrogen concentrations (5, 10, 15, 20, 25 mM NO3 , i.e. N5 to N25) and two irradiances, I (200 and 400 µmol m−2 s−1 of photon flux density, i.e. I 200 and I 400). Net photosynthetic rate (P N), photosynthetic nitrogen use efficiency (PNUE), leaf chlorophyll (Chl) content, maximum photochemical efficiency (Fv/Fm), and actual photochemical efficiency of photosystem 2 (PS2) (ΦPS2) increased from N5 to N15 and decreased with N15 to N25. P N, PNUE, and ΦPS2 were higher at I 400 than at I 200, but Fv/Fm and leaf Chl contents at I 400 were lower than at I 200. The effects of the N and I on specific leaf area (SLA) and N contents per unit dry mass (Nm) were similar, the SLA and Nm increased from N5 to N25 and they were higher at I 200 than at I 400. The nitrogen contents per unit area (Na) increased from N5 to N20, but decreased from N20 to N25. The Na was higher at I 200 than at I 400 when Trifolium repens grew at N5 and N10, but it was higher at I 400 than at I 200 at N15 to N25.

Additional key words

actual photochemical efficiency of photosystem 2 chlorophyll content and fluorescence clover photosynthetic acclimation irradiance photosynthetic nitrogen use efficiency specific leaf area 


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Copyright information

© Institute of Experimental Botany, ASCR 2008

Authors and Affiliations

  1. 1.National Laboratory of Soil Erosion and Dryland Farming on the Loess PlateauNorthwest A & F UniversityYangling, ShaanxiP.R. China
  2. 2.Institute of Soil and Water ConservationChinese Academy of SciencesYangling, ShaanxiP.R. China

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