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| 供氮水平对盐胁迫下水稻叶片光合及叶绿素荧光特性的影响 | |
| 引用本文： | 徐晨,刘晓龙,李前,凌凤楼,武志海,张治安.供氮水平对盐胁迫下水稻叶片光合及叶绿素荧光特性的影响[J].植物学报,2018,53(2):185-195. |
| 作者姓名： | 徐晨 刘晓龙 李前 凌凤楼 武志海 张治安 |
| 作者单位： | 1吉林农业大学农学院, 长春 130118; 2中国科学院东北地理与农业生态研究所, 长春 130102 3吉林省农业科学院农业资源与环境研究所, 长春 130124 |
| 基金项目： | 国家自然科学基金(No.31171478)和吉林省科技发展计划(No.20160107013NY, No.20170203003NY) |
| 摘 要： | 为了解供氮水平对不同时期盐胁迫下水稻(Oryza sativa)叶片光合及叶绿素荧光特性的影响, 以2个北方常规粳稻(Oryza sativa subsp. japonica)品种为材料, 在5个氮水平下进行培养, 于分蘖期、孕穗期和抽穗期分别进行盐胁迫处理, 测定分析了水稻叶片光合及叶绿素荧光参数的变化。结果表明, 与对照相比, 盐胁迫下水稻叶片的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和表观叶肉导度(AMC)均显著降低, 在分蘖期、孕穗期和抽穗期分别以2N、1N和1/2N水平下降低的百分率最小; 气孔限制值(Ls)则显著增加, 分别以2N、1N和1/2N水平下增加的百分率最大。盐胁迫下, 与对照相比, PSII的实际光合效率(ΦPSII)、表观光合量子传递效率(ETR)和光化学淬灭(qP)均显著降低, 在分蘖期、孕穗期和抽穗期分别以2N、1N和1/2N水平下降低的百分率最小; 非光化学淬灭(NPQ)呈增加的变化趋势, 与对照相比, 分别以2N、1N和1/2N水平下增加的百分率最小。以上结果说明盐胁迫下水稻孕穗后, 供氮水平适量降低有利于减缓叶片光合作用的下降, 提高其抵御盐害能力。 |
| 收稿时间： | 2017-03-25 |
| 修稿时间： | 2017-07-03 |
Effect of Salt Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Rice Leaf for Nitrogen Levels |
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| Chen Xu,Xiaolong Liu,Qian Li,Fenglou Ling,Zhihai Wu,Zhian Zhang.Effect of Salt Stress on Photosynthesis and Chlorophyll Fluorescence Characteristics of Rice Leaf for Nitrogen Levels[J].Bulletin of Botany,2018,53(2):185-195. | |
| Authors: | Chen Xu Xiaolong Liu Qian Li Fenglou Ling Zhihai Wu Zhian Zhang |
| Institution: | 1Faculty of Agronomy Jilin Agricultural University, Changchun 130118, China; 2Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; 3Institute of Agricultural Resources and Environment Research, Jilin Academy of Agricultural Sciences, Changchun 130124, China |
| Abstract: | We aimed to understand the influence of nitrogen levels on photosynthetic characteristics and chlorophyllfluorescence characteristics of rice leaf in different periods under salt stress. With two conventional japonica rice varietiesfrom the north used as materials, the effect of five nitrogen levels were studied. Salt stress was applied at tillering, bootingand heading. We studied the change in photosynthesis and chlorophyll fluorescence parameters of rice leaf. The netphotosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr) and apparent mesophyll conductance (AMC)were significantly reduced under salt stress as compared with controls. The percentage decrease of Pn, Gs, Tr and AMCduring tillering, booting and heading was minimum of 2N, 1N and 1/2N levels. The stomatal limitation (Ls) of rice leaf wassignificantly increased under salt stress. The percentage increase in Ls during tillering, booting and heading was maximumof 2N, 1N and 1/2N levels. The PSII actual photosynthetic efficiency (ΦPSII), apparent photosynthetic quantumtransmission efficiency (ETR) and photochemical quenching (qP) were significantly reduced under salt stress as comparedwith controls. The percentage decrease in ΦPSII, ETR and qP during tillering, booting and heading was minimum of2N, 1N and 1/2N levels. The non-photochemical quenching (NPQ) was increased under salt stress. The percentage increasein NPQ during tillering, booting and heading was minimum of 2N, 1N and 1/2N levels as compared with controls. Amoderate amount of reducing nitrogen levels was helpful to slow the decline of leaf photosynthesis and to improve theability to resist salt injury after booting stage of rice under salt stress. |
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