盐胁迫对海滨木槿幼苗生长及光合特性的影响  

Effect of Salt Stress on Growth and Photosynthetic Characteristics of Hibiscus hamabo Seedings

作　　者：卢刚[1] 李贺鹏[1] 张晓勉[1] 陈燕[2] 岳春雷[1] 高智慧 

机构地区：[1]浙江省林业科学研究院,浙江杭州310023 [2]浙江长征职业技术学院,浙江杭州310023 [3]浙江省林业技术推广总站,浙江杭州310020

出　　处：《浙江林业科技》2015年第3期16-25,共10页Journal of Zhejiang Forestry Science and Technology

基　　金：浙江省省属科研院所专项项目(2013F50002;2014F50017);省院合作项目(2013SY14);浙江省重点科技创新团队项目(2011R50027);"台州湾围垦区植物区系及耐盐性研究与种植示范"

摘　　要：通过人工模拟的方法研究了NaCl胁迫(0、0.3%、0.6%、0.9%)对海滨木槿幼苗生长和光合特性的影响。结果表明:除了0.9%处理组1株第44 d死亡,盐胁迫对其他幼苗的生长影响不大;海滨木槿的光合指标随盐胁迫浓度、胁迫时间的变化而动态变化,至30 d,所有处理的叶绿素含量(Chl)恢复至正常水平,0.3%处理组的各指标中除了Rd和LCP外均恢复至正常水平,0.6%和0.9%处理组的各指标也得到不同程度的恢复;胁迫40 d,除了0.6%处理组的Rd和LCP显著高于对照,以及0.9%处理组的Pnmax显著低于对照(p<0.05)外,各指标基本恢复至对照水平;研究表明海滨木槿不仅对盐胁迫具有一定的耐性,且对胁迫伤害具有较强的自我恢复能力。Simulated salt stress with 0, 0.3%, 0.6%, 0.9% of NaC1 was conducted on 2-year seedling of Hibiscus hamabo to study effect on growth and photosynthetic characteristics. Net photosynthetic rate （P,）, stomatal conductance （Gs）, intercellular CO2 concentrations （C1） and others were determined on 10th, 20th, 30th and 40th day after salt stress treatments. The results showed that salt stress had no great effect on the growth of H. hamabo seedlings, expect one treated seedling （died 44 days after treatment） with 0.9% of NaCl. Photosynthetic parameters changed with variation of concentration and the f＇Lrst 20 days of the stress. At the 30th days of the stress, chlorophyll content（Chl） of each treatment recovered, and photosynthetic parameters of treatment with 0.3% recovered except dark respiration rate （Rd） and light compensation point （LCP）, and that of treatment with 0.6% and 0.9% recovered varying degrees. At the 40th days of the stress, most of parameters recovered except Rd and LCP of seedlings treated with 0.6% was higher than that of the control, and maximum net photosynthetic rate （Pn max） of seedlings treated with 0.9% was higher than that of the control. The result also indicated that H. Hamabo had strong tolerance to NaCI stress and could recovered from damage of NaC1.

关 键 词：海滨木槿 盐胁迫 光合特性 耐盐 生理特性 光响应 

分 类 号：S718.5[农业科学—林学]