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• W2377014750 abstract "Nitrogen (N) is the most important nutrients for plants. Detailed studies on the influence of N supply on photosynthesis have been reported in many plant species, but seldom in larch, which is a significant forestation species in Northeast China. In this paper, we report the characteristics of photosynthesis in larch seedlings that have been provided with different N supplies. The experiment was conducted in greenhouse from April 2003 to September 2003. On April 5, one-year-old larch (Larix gmelinii) seedlings were transplanted into plastic pot (diameter 30 cm, height 27 cm) containing sterilized and washed quartz sand after extensive washing and sterilizing of the roots. The seedlings were supplied with a complete nutrient solution for 40 days: This solution contained 4 mmol/L of NH_4NO_3, 1 mmol/L of KH_2PO_4, 1 mmol/L of KCl, 1 mmol/L of CaCl_2, 0.6 mmol/L of MgSO_4, 0.02 mmol/L of FeCl_3, 6 μmol/L of MnCl_2, 0.016 mmol/L of H_3BO_3, 0.3 μmol/L of ZnCl_2, 0.3 μmol/L of CuCl_2, 0.3 μmol/Lof NaMoO_4. On the May 15, the seedlings were treated with four different N concentrations (1, 4, 8 and 16 mmol/L, respectively). After 15-weeks of treatment, gas exchange, chlorophyll fluorescence and some biochemical parameters were determined. The results showed that with an increase in N supply, the levels of both N and chlorophyll in the needles were up significantly, while the phosphorus content declined. The light-saturated net photosynthetic rate (P_~max ) of the needles showed a linear increase when N supply was increased form 1 mmol/L to 8 mmol/L. Meanwhile, total soluble protein (TSP) content and stomatal conductance (g_s) were also increased, whereas internal to ambient CO_2 concentration ratio (C_i/C_a) was decreased. When the N supply exceeded 8 mmol/L and reached 16 mmol/L, the P_~max and the TSP content exhibited a non-significant decease. N deficiency caused a significant decline in the maximum quantum efficiency of photosystem Ⅱ (PSⅡ) photochemistry (F_v/F_m), quantum efficiency of PSⅡ (Φ_~PSⅡ ) and the photochemical quenching co-efficient (qP). These changes were accompanied by an increase in both the non-photochemical quenching co-efficient (NPQ) and the carotenoid/chlorophyll ratio (Car/Chl). Although increasing the N supply increased F_v/F_m, Φ_~PSⅡ and qP, the chlorophyll fluorescence parameters showed little change when the N level exceeded 8 mmol/L. These results suggested that when plants grow in a N deficiency condition, increasing the N supply can enhance their photosynthetic capability by improving photochemistry quantum efficiency of PSⅡ and alleviating photoinhibition. Regarding the results of 16 mmol/L condition, although this condition may have exceeded the optimum N level for larch seedlings, the negative effect of excess N supply might be mainly due to nutrient imbalance." @default.
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• W2377014750 date "2005-01-01" @default.
• W2377014750 modified "2023-09-24" @default.
• W2377014750 title "Effects of nitrogen supply on photosynthesis in larch seedlings" @default.
• W2377014750 hasPublicationYear "2005" @default.
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