| 硅对NaCl胁迫下柳枝稷叶片光合色素及气体交换特性的影响 |
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| 引用本文： | 李菁,闫岩,魏韬书,赵璐,任荣荣,屈媛媛,呼天明,龙明秀,何树斌.硅对NaCl胁迫下柳枝稷叶片光合色素及气体交换特性的影响[J].草业科学,2016,33(11):2283-2290. |
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| 作者姓名： | 李菁 闫岩 魏韬书 赵璐 任荣荣 屈媛媛 呼天明 龙明秀 何树斌 |
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| 作者单位： | 西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100;西北农林科技大学动物科技学院,陕西杨凌,712100 |
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| 基金项目： | 西北农林科技大学基本科研业务费(2014YB007;2014YB001)，西北农林科技大学博士科研启动费(Z111021312) |
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| 摘 要： | 以两个不同生态型的柳枝稷(Panicum virgatum)Alamo(低地型)和Cave-in-Rock(高地型)为试验材料,研究在0、50、100和150mmol·L~(-1) NaCl浓度下,分别添加0、0.5、1.0和2.0mmol·L~(-1)的外源硅(Na_2SiO_3·9H_2O)对其叶片光合色素含量及光合气体交换参数的影响。结果表明,Alamo叶片的叶绿素a、叶绿素b以及叶绿素a+b的含量均随着NaCl浓度的升高呈现降低趋势,但是Cave-in-Rock的变化趋势则相反。在无外源Si处理下,Alamo叶片净光合速率(Pn)和气孔导度(Gs)在50mmol·L~(-1) NaCl浓度下升高,100和150mmol·L~(-1)下降低;Cave-in-Rock的Pn、Gs和胞间CO_2浓度(Ci)随着NaCl浓度的增加逐渐降低。盐胁迫下,适当浓度外源硅(Si)的添加对Alamo和Cave-inRock叶绿素a、叶绿素a+b和叶绿素b、类胡萝卜素含量的提高具有积极的作用。外源Si的添加同样提高了盐胁迫下Pn、Gs和Ci等参数。本研究中,1~2mmol·L~(-1) Na_2SiO_3·9H_2O对盐胁迫下柳枝稷叶片光合色素及光合气体交换的促进作用较明显。
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| 关 键 词： | 柳枝稷 硅 盐胁迫 叶片光合色素 气体交换参数 |
| 收稿时间： | 2016-01-11 |
Effect of silicon on chlorophyll content and gas exchange characteristics of switchgrass under NaCl stress |
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| Li Jing,Yan Yan,Wei Tao-shu,Zhao Lu,Ren Rong-rong,Qu Yuan-yuan,Hu Tian-ming,Long Ming-xiu,He Shu-bin.Effect of silicon on chlorophyll content and gas exchange characteristics of switchgrass under NaCl stress[J].Pratacultural Science,2016,33(11):2283-2290. |
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| Authors: | Li Jing Yan Yan Wei Tao-shu Zhao Lu Ren Rong-rong Qu Yuan-yuan Hu Tian-ming Long Ming-xiu He Shu-bin |
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| Institution: | Northwest A & F University College of Animal Science and Technology, Yangling 712100, China |
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| Abstract: | The effects of silicon on chlorophyll content and gas exchange characteristics of two different ecotype varieties switchgrass (Panicum virgatum) including “Alamo”(lowland) and “Cave-in-Rock”(upland) under salt stress were investigated. The concentrations of NaCl and Si NaSiO3·9H2O were 0, 50, 100, 150 mmol·L-1 and 0, 0.5, 1, 2 mmol·L-1, respectively. The results showed that the chlorophyll contents of “Alamo” decreased significantly (P<0.05) under salt stress, but that of “Cave-in-Rock” slightly increased. The net photosynthetic rate (Pn) and stomatal conductance (Gs) of “Alamo” increased at 50 mmol·L-1 NaCl level, then decreased at 100 and 150 mmol·L-1 levels of NaCl concentrations. Pn, Gs and intercellular CO2 concentration (Ci) of “Cave-in-Rock” decreased significantly (P<0.05) with increasing NaCl levels. Optimal concentration of exogenous silicon addition had alleviated the reduction of chlorophyll and improved gas exchange ability of “Alamo” and “Cave-in-Rock” under salt stress. In our study, 1-2 mmol·L-1 was the optimal concentration of silicon (Si). |
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| Keywords: | Panicum virgatum silicon salt stress chlorophyll gas exchange characteristics |
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