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| 盐胁迫对桑树幼苗光合生理生态特性的影响 | |
| 引用本文： | 柯裕州,周金星,张旭东,孙启祥,左力.盐胁迫对桑树幼苗光合生理生态特性的影响[J].林业科学,2009,45(8). |
| 作者姓名： | 柯裕州 周金星 张旭东 孙启祥 左力 |
| 作者单位： | 1. 中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京,100091;西藏自治区林业局,拉萨,850000 2. 中国林业科学研究院林业研究所,国家林业局林木培育重点实验室,北京,100091 3. 西藏自治区林业局,拉萨,850000 |
| 基金项目： | 国家"十一五"科技支撑项目"长江中下游低山丘陵生态退化区植被恢复技术实验示范" |
| 摘 要： | 采用盆栽加盐的方式来人工模拟盐胁迫环境,通过设置0(不加盐),0.1%,0.3%,0.5%和0.7%5个盐分梯度,研究NaCl胁迫对桑树幼苗光合作用及其光响应和CO2响应的影响.结果表明:0.1%NaCl对桑树幼苗的光合生理生态特性没有明显影响;当NaCl浓度≥0.3%时,盐胁迫显著降低桑树幼苗的净光合速率(Pn),气孔导度(GB)、蒸腾速率(TT)、水分利用率(WUE)、光能利用效率(SUE)和羧化效率(CUE),增加胞间CO2浓度(Ci).造成桑树幼苗Pn降低的效应是由非气孔因素和气孔因素2者协同作用的结果;低盐浓度处理时,桑树幼苗Pn降低主要是气孔因素控制的,而高盐浓度处理时,则主要受非气孔因素控制.在光响应和CO2响应过程中,光强和CO2浓度对各种处理的桑树幼苗净光合速率具有显著影响,但其影响的程度和盐浓度密切相关,且盐处理浓度越大,其影响效果越低.此外,盐胁迫能显著降低桑树幼苗的表观量子效率(AQY)、表观羧化效率(ACE)和光饱和点(LSP),增加光补偿点(LCP)、CO2补偿点(CCP). |
| 关 键 词： | 桑树 盐胁迫 光合生理特性 光响应 CO2响应 |
Effects of Salt Stress on Photosynthetic Characteristics of Mulberry Seedlings |
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| Ke Yuzhou,Zhou Jinxing,Zhang Xudong,Sun Qixiang,Zuo Li.Effects of Salt Stress on Photosynthetic Characteristics of Mulberry Seedlings[J].Scientia Silvae Sinicae,2009,45(8). | |
| Authors: | Ke Yuzhou Zhou Jinxing Zhang Xudong Sun Qixiang Zuo Li |
| Institution: | 1. Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration Research Institute of Forestry;CAF Beijing 100091;2. The Forestry Bureau of Tibet Municipality Lasa 850000 |
| Abstract: | Effects of salt stress on photosynthetic characteristics of 1-year-old potted mulberry (Morus alba) seedlings,a common stock of mulberry,were investigated. The seedlings were treated with NaCl concentrations at 0.1%,0.3%,0.5% and 0.7%,fresh water as the control. Using LI-COR 6400 portable photosynthesis system,the net photosynthetic rate (P_n),stomatal conductance(G_s),intercellular CO_2 concentrations(C_i) and transpiration rate(T_r) were measured on 1~ st ,2~ nd ,3~ rd and 7~ th day after treatments,and t... |
| Keywords: | mulberry stock salt stress photosynthetic characteristics light response CO_2 response |
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