WU Xiao-ling,ZHANG Li-jun,NIE Shao-xian,et al.Effects of Low Light on Growth and Photosynthetic Fluorescence Characteristics in Soybean Seedling[J].Soybean Science,2014,33(01):53-57.[doi:10.11861/j.issn.1000-9841.2014.01.0053]
弱光对大豆苗期生长及光合荧光特性的影响
- Title:
- Effects of Low Light on Growth and Photosynthetic Fluorescence Characteristics in Soybean Seedling
- 文章编号:
- 1000-9841（2014）01-0053-05
- Keywords:
- Soybean; Light-intensity; Photosynthesis; Chlorophyll fluorescent
- 分类号:
- S565.1
- 文献标志码:
- A
- 摘要:
- 选用大豆品种贡选1号（耐荫）和桂夏3号（不耐荫）为材料，在室内模拟玉米/大豆套作下的光照强度，设定光照强度分别为12 000，7 200和3 600 lx，考察弱光对于大豆苗期生长及叶片光合荧光特性的影响。结果表明：随光照强度的下降两个大豆品种幼苗株高逐渐增加，而茎粗、根长、生物量以及根冠比降低，桂夏3号的变化幅度大于贡选1号；光照强度为3 600 lx时叶绿素a含量均显著提高；净光合速率(Pn)和蒸腾速率(Tr)随光照强度的下降呈现先上后降的趋势，气孔导度(Gs)和胞间CO2浓度(Ci)则逐渐上升；桂夏3号的实际荧光（F）、最大荧光产量（Fm′）、初始荧光（Fo）、最大荧光（Fm）值随着光强的降低而增大，而贡选1号却呈现低-高-低的趋势；两个品种的非光化学淬灭（NPQ）随光强降低变化趋势相反，而在PSII潜在活性（Fv/Fo）方面呈现高-低-高的一致趋势。因此，不同耐荫性大豆品种的生长及光合荧光特性对弱光的响应存在差异，适宜品种的选择是间套作大豆生产的关键因素之一
- Abstract:
- Soybean seedlings are usually affected by shading in maize-soybean relay strip intercropping conditions.This work aimed to investigate the response of soybean seedling growth and photosynthetic fluorescence characteristics to low light environment.The light intensity of 12 000，7 200 and 3 600 lx were chose for simulating different light environment.Soybean(G.max L.Merr.)cultivar Gongxuan 1(shade tolerance)and Guixia 3(shade sensitive)were used as experimental materials.The results showed that the height increased and the values of stem diameter,root diameter,root length,biomass,and root-shoot ratio decreased with declined of light intensity.For photosynthetic pigments,the 3 600 lx light intensity were significantly higher than that of CK.With light intensity declined,net photosynthetic rate(Pn) and transpiration rate(Tr) appeared the trend of low-high-low,whereas stomatal conductance(Gs) and intercellular CO2?concentration(Ci) gradually decreased.Fluorescence parameters F,Fm′,Fo and Fm of Guixia 3 increased with the declining of light intensity,however,those of Gongxuan 1 were maximized in light intensity of 7 200 lx.In addition,the non-photochemical quenching(NPQ) increased and the Fv/Fo displayed a trend of high-low-high of two soybean varieties with the decrease of light intensity.
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备注/Memo
基金项目：现代农业产业技术体系专项（CARS-04-PS19）; 四川省教育厅育种专项（00128501）。