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

李菁; 闫岩; 魏韬书; 赵璐; 任荣荣; 屈媛媛; 呼天明; 龙明秀; 何树斌

doi:10.11829/j.issn.1001-0629.2016-0006

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

西北农林科技大学动物科技学院, 陕西杨凌 712100

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150 mmolL-1 NaCl浓度下,分别添加0、 0.5、 1.0和2.0 mmolL-1的外源硅(Na2SiO39H2O)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50 mmolL-1NaCl浓度下升高,100和150 mmolL-1下降低;Cave-in-Rock的Pn、Gs和胞间CO2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-in-Rock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,1~2 mmolL-1 Na2SiO39H2O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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English

Effect of silicon on chlorophyll content and gas exchange characteristics of switchgrass under NaCl stress

Received Date: 2016-01-10
Publish Date: 2016-11-19

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 NaSiO39H2O were 0, 50, 100, 150 mmolL-1 and 0, 0.5, 1, 2 mmolL-1, respectively. The results showed that the chlorophyll contents of Alamo decreased significantly (P0.05) 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 mmolL-1 NaCl level, then decreased at 100 and 150 mmolL-1 levels of NaCl concentrations. Pn, Gs and intercellular CO2 concentration (Ci) of Cave-in-Rock decreased significantly (P0.05) 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 mmolL-1 was the optimal concentration of silicon (Si).

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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

English

Effect of silicon on chlorophyll content and gas exchange characteristics of switchgrass under NaCl stress

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