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Adaptability to elevated temperature and nitrogen addition is greater in a high-elevation population than in a low-elevation population of Hippophae rhamnoides

机译:高海拔人群中沙棘的高海拔种群对高温和氮的适应性更高。

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Hippophae rhamnoides L. is a broadleaf deciduous woody shrub occurring in southwest China, where it has been widely used in ecological restoration. In this study we investigated growth and physiological responses of 2-year-old healthy seedlings to elevated temperature, nitrogen (N) addition and their combination in two contrasting populations from high and low elevations. In closed-top chamber experiments, two populations were subjected to two temperature conditions (ambient temperature and temperature elevated by 2.2 ± 0.2°C) and two N levels (0 and 25 g N m−2 a−1). Compared with the control, increases in total leaf area (TLA), total chlorophyll content (TC), light-saturated photosynthetic rate (P max), guaiacol peroxidase activity (POD), catalase activity (CAT) and carbon isotope composition (δ13C) were greater in the high-elevation population than in the low-elevation population under elevated temperature. On the other hand, decreases in root and shoot biomass ratio (RS), TC, P max, light saturation point (L SP), light compensation point (L CP), superoxide dismutase (SOD), POD, CAT and δ13C were lower in the high-elevation population than in the low-elevation population under N addition. Moreover, the combination of elevated temperature and N addition decreased RS, P max, apparent quantum efficiency (Φ), SOD, POD and δ13C significantly more in the low-elevation population than in the high-elevation population. These results demonstrated that there are different adaptive strategies among H. rhamnoides populations, the high-elevation population exhibiting higher adaptability to elevated temperature and N addition than the low-elevation population.
机译:沙棘(Hippophae rhamnoides L.)是中国西南部的一种阔叶落叶木本灌木,已在生态修复中得到广泛应用。在这项研究中,我们调查了高龄和低海拔两个不同种群中2岁健康幼苗对高温,氮(N)添加及其组合的生长和生理响应。在密闭室实验中,两个种群受到两个温度条件(环境温度和温度升高2.2±0.2°C)和两个氮水平(0和25 g N m -2 a < sup> -1 )。与对照组相比,总叶面积(TLA),总叶绿素含量(TC),光饱和光合速率(P max ),愈创木酚过氧化物酶活性(POD),过氧化氢酶活性(CAT)增加高温下高海拔种群的碳同位素组成(δ 13 C)大于低海拔种群。另一方面,根和茎生物量比(RS),TC,P max ,光饱和点(L SP ),光补偿点(L CP ),超氧化物歧化酶(SOD),POD,CAT和δ 13 C在添加氮的情况下比低海拔人群低。此外,在低温条件下,高温和氮添加的组合显着降低了RS,P max ,表观量子效率(Φ),SOD,POD和δ 13 C。高海拔人群要比高海拔人群高。这些结果表明,鼠李糖高粱种群之间存在不同的适应策略,高海拔种群比低海拔种群对高温和氮的适应性更高。

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