| 碱性盐胁迫对夏蜡梅光合荧光特性影响 |
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| 引用本文： | 周贝宁,毛恋,花壮壮,芦建国.碱性盐胁迫对夏蜡梅光合荧光特性影响[J].浙江农业学报,2021,33(8):1416. |
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| 作者姓名： | 周贝宁 毛恋 花壮壮 芦建国 |
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| 作者单位： | 南京林业大学 风景园林学院, 江苏 南京 210037 |
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| 基金项目： | 江苏高校品牌专业建设工程(PPZY2015A063);江苏高校优势学科建设工程(PAPD) |
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| 摘 要： | 以3年生夏蜡梅实生苗为试验材料,采用CK、0.1%、0.2%、0.3%、0.4%、0.5%、0.6%、0.7%八个碱性盐(NaHCO3)处理水平,探究不同碱性盐胁迫对夏蜡梅光合荧光特性的影响,为夏蜡梅的生产实践栽培提供理论指导。结果表明,在NaHCO3胁迫下,夏蜡梅净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)、水分利用率(WUE)、最大净光合速率(Pnmax)和光饱和点(LSP)等光合指标均呈下降趋势且浓度越高下降越显著,胞间CO2浓度(Ci)呈先降低后升高趋势,光补偿点(LCP)则呈上升趋势;随着NaHCO3浓度的升高,夏蜡梅叶片的OJIP曲线逐渐出现明显K点,Fo先降低后升高,Fm、Fv、Fv/Fm和Fv/Fo呈现先升高后降低的趋势,叶片单位反应中心吸收的光能ABS/RC、热耗散的能量DIo/RC与捕获的用于还原QA的能量TRo/RC均呈先下降后上升趋势,而用于单位反应中心电子传递的能量ETo/RC逐渐下降。碱性盐胁迫对夏蜡梅的光合系统造成了损伤,且浓度越高损伤程度越大;低浓度NaHCO3胁迫导致夏蜡梅气孔限制净光合速率Pn降低,其对夏蜡梅叶片光化学荧光性能的抑制作用较弱,适当提高了PSⅡ反应中心活性;高浓度(>0.3%)胁迫导致夏蜡梅净光合速率Pn下降的原因可能是非气孔限制,严重破坏PSⅡ反应中心供体侧、受体侧,并导致大部分PSⅡ反应中心失活。
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| 关 键 词： | 夏蜡梅 碱性盐胁迫 光合特性 叶绿素荧光特性 |
| 收稿时间： | 2020-12-15 |
Effects on photochemical fluorescence properties under salt-alkaline stresses about Sinocalycanthus chinensis |
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| ZHOU Beining,MAO Lian,HUA Zhuangzhuang,LU Jianguo.Effects on photochemical fluorescence properties under salt-alkaline stresses about Sinocalycanthus chinensis[J].Acta Agriculturae Zhejiangensis,2021,33(8):1416. |
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| Authors: | ZHOU Beining MAO Lian HUA Zhuangzhuang LU Jianguo |
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| Institution: | College of Landscape Architecture, Nanjing Forestry University, Nanjing 210037, China |
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| Abstract: | Three-year-old seedlings of Sinocalycanthus chinensis were used as experimental materials and set up eightalkaline salt NaHCO3 treatment levels (CK, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%, 0.6%, 0.7%) to explore the effects of different alkaline salt stresses on the photosynthetic fluorescence characteristics of Sinocalycanthus chinensis, whichprovided theoretical guidance for the production practice and cultivation of Sinocalycanthus chinensis. The results showed that under NaHCO3 stress, photosynthetic indices such as net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs), water use efficiency (WUE), maximum net photosynthetic rate (Pnmax) and light saturation point (LSP) all showed downward trends, and the higher the concentration was, the more significant the decline. The intercellular CO2 concentration (Ci) exhibited changes of decreasing followed by increase, while the light compensation point (LCP) showed an upward trend. With the increase of NaHCO3 concentration, the OJIP curve of Sinocalycanthus chinensis leaves gradually showed an obvious K point, and Fo exhibited changes of decreasing followed by increase, while Fm, Fv, Fv/Fm and Fv/Fo exhibited changes of increasing followed by decrease. The light energy absorbed by the unit reaction center ABS/RC, the energy dissipated by heat DIo/RC and the energy captured for QA reduction TRo/RC all exhibited changes of decreasing followed by increase, while the energy used for electron transfer in the unit reaction center ETo/RC gradually decreased. It indicated that the alkaline salt stress caused damage to the photosynthetic system of Sinocalycanthus chinensis, and the higher the concentration was, the greater the damage degree was. Low concentration of NaHCO3 stress caused the decrease of net photosynthetic rate Pnof Sinocalycanthus chinensis due to stomatal limitation and had a weak inhibitory effect on the photochemical fluorescence performance of leaves, which properly improved the activity of PSⅡreaction center. The reason for the decrease of Pn caused by high concentration (>0.3%) stress might be non-stomatal restriction, seriously damaging the donor side and receptor side of PSⅡreaction center and leading to the inactivation of most PSⅡreaction centers. |
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| Keywords: | Sinocalycanthus chinensis saline-alkali stress photosynthetic characteristic chlorophyll fluorescence characteristic |
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