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Effects of Increased Carbon Supply on the Growth, Nitrogen Metabolism and Photosynthesis of Vallisneria natans Grown at Different Temperatures
Wetlands ( IF 1.8 ) Pub Date : 2020-04-04 , DOI: 10.1007/s13157-020-01293-6
Heng Jiang , Bing Huang , Zhan Qian , Yue Xu , Xiaohong Liao , Ping Song , Xichun Li

Vallisneria natans is often used for the ecological restoration of aquatic vegetation. V. natans thalli were cultured under ambient (400 ppm) and increased carbon supply, with low (18 °C) and high temperature (25 °C). The thalli were used to examine the effects of increased carbon and high temperature on the growth, nitrogen metabolism and photosynthetic characteristics of this plant. At 18 °C, the relative growth rate (RGR), N uptake rate and nitrate reductase (NR) activity of V. natans thalli grown under ambient carbon supply were lower than those under increased carbon supply. The increased carbon supply decreased the RGR, N uptake rate, NR activity and maximum inorganic carbon (Ci) -saturated photosynthetic rate (Vmax) of V. natans when it was cultured at 25 °C. Regardless of the carbon supply levels, the growth, nitrogen uptake capacity and photosynthesis of V. natans thalli grown at 25 °C decreased compared with those of V. natans thalli grown at 18 °C. The RGR and photosynthetic rate of V. natans grown in the presence of increased carbon supply and high temperature were the lowest amongst the four different conditions. Therefore, the negative effects caused by a high temperature were pronounced under the condition of a global atmospheric CO2 increase.



中文翻译:

碳供应增加对不同温度下生长的苦参生长,氮代谢和光合作用的影响

Vallisneria natans常被用于水生植被的生态恢复。在较低的温度(18°C)和较高的温度(25°C)下,在室温(400 ppm)和碳供应增加的条件下培养纳塔尔葡萄。thalli用于检查碳和高温对这种植物生长,氮代谢和光合特性的影响。在18℃,相对生长率(RGR),N摄取率和硝酸还原酶(NR)活性苦草在环境碳供给菌体生长均较碳供应增加下更低。增加的碳供应降低了小麦的RGR,N吸收率,NR活性和最大无机碳(Ci)饱和光合速率(V max)。V. natans在25°C下培养。无论碳供应水平如何,与在18°C下生长的纳塔纳斯藻相比,在25°C下生长的纳塔纳斯藻的生长,氮吸收能力和光合作用均下降。的RGR和光合速率苦草在增加的碳供应和高温的存在下生长的分别为最低之间的四个不同条件。因此,在全球大气CO 2增加的条件下,由高温引起的负面影响是明显的。

更新日期:2020-04-04
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