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

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

Photosynthetica 46(1): 143-147

Clover seedlings were grown at different nitrogen concentrations (5, 10, 15, 20, 25 mM NO3- i.e. N-5 to N-25) and two irradiances, I (200 and 400 mu mol 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 (F-v/F-m), and actual photochemical efficiency of photosystem 2 (PS2) (Phi(PS2)) increased from N-5 to N-15 and decreased with N-15 to N-25. P (N), PNUE, and Phi(PS2) were higher at I (400) than at I (200), but F-v/F-m 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 (N-m) were similar, the SLA and N-m increased from N-5 to N-25 and they were higher at I (200) than at I (400). The nitrogen contents per unit area (N-a) increased from N-5 to N-20, but decreased from N-20 to N-25. The N-a was higher at I (200) than at I (400) when Trifolium repens grew at N-5 and N-10, but it was higher at I (400) than at I (200) at N-15 to N-25.

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Accession: 021785556

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DOI: 10.1007/s11099-008-0023-y

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