LI Erbao,FAN Wenhua,LIU Fenwu,et al.Effects of Silicon on Growth and Photosynthesis of Cucumber Seedling Under Cadmium Stress[J].Northern Horticulture,2021,(08):8-16.[doi:10.11937/bfyy.20203083]
硅对镉胁迫下黄瓜苗期生长及光合作用的影响
- Title:
- Effects of Silicon on Growth and Photosynthesis of Cucumber Seedling Under Cadmium Stress
- 文献标志码:
- A
- 摘要:
- 以“津绿21-10”黄瓜为试材，采用盆栽试验方法，研究了石灰性褐土在不同硅浓度介入对不同镉浓度胁迫下黄瓜苗期生长、光合色素含量、叶绿素荧光参数及光合参数的影响，以期探究硅对镉毒害的缓解作用。结果表明：镉胁迫均影响黄瓜苗期生长，功能叶片光合色素含量，叶绿素荧光参数和光合参数。硅的介入提高了黄瓜苗期生长量、光合色素含量、PSⅡ实际光合量子产量（Y(Ⅱ)）、光化学淬灭系数（qP）、净光合速率（Pn）、蒸腾速率（Tr）、气孔导度（Gs），降低了初始荧光（Fo）、胞间二氧化碳浓度（Ci）；PSⅡ 最大光化学效率（Fv/Fm），在较高浓度硅（Si≥300 mg?kg-1）介入后，各浓度镉胁迫下对Fv/Fm无显著影响，并且趋于稳定；黄瓜功能叶片类胡萝卜素在硅浓度100～300 mg?kg-1介入下，体现出其保护机制；高浓度镉（5 mg?kg-1）胁迫下，需施加足量硅浓度（Si≥200 mg?kg-1）才能体现对黄瓜苗期生理指标的缓解作用。说明硅介入可以缓解镉胁迫对黄瓜苗期生理特性的毒害，改善镉胁迫下黄瓜苗期叶片的光系统Ⅱ以及光合作用，施用适量的硅可以抑制和缓解镉污染土壤中植物的镉毒害。
- Abstract:
- Taking cucumber ‘Jinlyu 21-10’ as test material,pot experiments were conducted,the effects of different Si concentrations on cucumber seedling growth,photosynthetic parameters pigment content,chlorophyll fluorescence parameters and photosynthetic parameters in calcareous cinnamon soil under different Cd concentrations were studied,in order to explore the mitigation effect of silicon on cadmium toxicity.The results showed that Cd stress affected cucumber seedling growth,photosynthetic pigment content of functional leaves,chlorophyll fluorescence parameters and photosynthetic parameters.Silicon intervention increased cucumber seedling growth,photosynthetic pigment content,actual photosynthetic quantum yield of PSⅡ (Y(Ⅱ)),photochemical quenching coefficient (qP),net photosynthetic rate (Pn),transpiration rate (Tr),stomatal conductance (Gs),and decreased initial fluorescence (Fo),intercellular carbon dioxide (Ci).The maximum photochemical efficiency (Fv/Fm) of PSⅡ was not significantly affected by cadmium stress at higher concentration of silicon (Si300 mg?kg-1),and Fv/Fm tended to be stable.The protective mechanism of carotenoids in Cucumber functional leaves was demonstrated by the intervention of silicon concentration from 100 mg?kg-1 to 300 mg?kg-1.Under high concentration cadmium (5 mg?kg-1) stress,silicon concentration (Si 200 mg?kg-1) was required to reflect the alleviation effect on physiological indexes of cucumber seedling.It indicated that silicon intervention could alleviate the toxicity of cadmium stress on physiological characteristics of cucumber seedling,improve the photosystem Ⅱ and photosynthesis of cucumber seedling leaves under cadmium stress,and apply appropriate amount of silicon fertilizer could inhibit and alleviate the cadmium toxicity of plants in cadmium-contaminated soil.
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备注/Memo
第一作者简介：李二豹（1994-），男，硕士研究生，研究方向为土壤重金属污染与植物机理。E-mail：807224607@qq.com.责任作者：樊文华（1962-），男，博士，教授，博士生导师，现主要从事土壤学与矿区土壤复垦的教学与科研等工作。E-mail：fwh012@163.com.基金项目：山西农业大学引进人才科研启动资助项目（XB2011017）；山西坤润现代农业发展公司资助项目。收稿日期：2020-07-21