不同磷素供给闽楠苗木对自然低温的生理响应
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国家林业局林业公益性行业科研专项(201204307-03);国家科技支撑计划(2012BAD01B0403)


Physiological response of Phoebe bournei seedlings with different phosphorus supply levels to natural low temperature
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    【目的】探明自然低温对不同磷素供给的闽楠 Phoebe bournei 苗木叶片生理特性的影响。【方法】设置 8个磷素水平的单因素盆栽试验,施肥结束后,将苗木置于自然低温环境处理,测定其叶片的光合生理特性及其他生理指标,采用主成分分析法评价苗木抗寒性。【结果】在自然低温环境时,随磷素水平的升高,正负相关指标均表现出了明显的升降趋势。30 mg·株-1磷素供应量的闽楠苗木叶片净光合速率(Pn)、气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(Tr)、光合水分利用效率(WUE)、脯氨酸含量和超氧化物歧化酶(SOD)活性均最高,其值分别为3.09 μmol·m-2·s-1、0.023 mol·m-2·s-1、350.18 μmol·mol-1、0.32 mmol·m-2·s-1、9.69、41.58 μmol·g-1 和332.03 U·g-1,丙二醛含量和气孔限制值(Ls)为第2低,其值分别为3.77 μg·g-1 和0.34。主成分综合分析结果显示,30 mg·株-1 磷素供应量苗木得分最高。【结论】30 mg·株-1磷素供给最有利于闽楠苗木抗低温胁迫能力的提高。

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    【Objective】To determine the effects of different phosphorus supply levels on physiological activity of Phoebe bournei seedling leaf under natural low temperature. 【Method】Single factor pot experiment was set up with eight phosphorus levels, and following fertilization the seedlings were left under natural low temperature. Photosynthetic and other physiological indexes of the leaves were measured and analyzed. Cold resistance of the seedlings was assessed by principal component analysis.【Result】Under natural low temperature environment, all the positive and negative indexes indicated clear and gradual trend with the increase of phosphorus levels. net photosynthetic rate(Pn),stomatal conductance(Gs),intercellular CO2 concentration(Ci),transpiration rate (Tr), water use efficiency(WUE), proline content and SOD activity of P. bournei seedling leaf peaked at a phosphorus level of 30 mg phosphorus per seedling, and their values were 3.09 μmol·m-2·s-1, 0.023 mol·m-2·s-1, 350.18 μmol·mol-1, 0.32 mmol·m-2·s-1, 9.69, 41.58 μmol·g-1 and 332.03 U·g-1,respectively. At the same phosphorus level, MDA content (3.77 μg·g-1) and stomatal limitation value (Ls,0.34) were the second lowest. The highest cold resistance score was obtained at a phosphorus level of 30 mg per seedling based on principal component analysis.【Conclusion】 The optimum phosphorus level is 30 mg per seedling for improving cold resistance of P. bournei seedlings.

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王东光,杨锦昌,李荣生,邹文涛,尹光天.不同磷素供给闽楠苗木对自然低温的生理响应[J].华南农业大学学报,2016,37(2):101-106

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  • 收稿日期:2015-06-18
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  • 在线发布日期: 2016-02-02