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    白晶晶, 吴俊文, 李吉跃, 何茜, 邱权, 潘昕. 干旱胁迫对2种速生树种叶绿素荧光特性的影响[J]. 华南农业大学学报, 2015, 36(1): 85-90. DOI: 10.7671/j.issn.1001-411X.2015.01.016
    引用本文: 白晶晶, 吴俊文, 李吉跃, 何茜, 邱权, 潘昕. 干旱胁迫对2种速生树种叶绿素荧光特性的影响[J]. 华南农业大学学报, 2015, 36(1): 85-90. DOI: 10.7671/j.issn.1001-411X.2015.01.016
    shu
    BAI Jingjing, WU Junwen, LI Jiyue, HE Qian, QIU Quan, PAN Xin. Effects of drought stress on chlorophyll fluorescence parameters of two fast-growing tree species[J]. Journal of South China Agricultural University, 2015, 36(1): 85-90. DOI: 10.7671/j.issn.1001-411X.2015.01.016
    Citation: BAI Jingjing, WU Junwen, LI Jiyue, HE Qian, QIU Quan, PAN Xin. Effects of drought stress on chlorophyll fluorescence parameters of two fast-growing tree species[J]. Journal of South China Agricultural University, 2015, 36(1): 85-90. DOI: 10.7671/j.issn.1001-411X.2015.01.016
    shu

    干旱胁迫对2种速生树种叶绿素荧光特性的影响

    Effects of drought stress on chlorophyll fluorescence parameters of two fast-growing tree species

      摘要
    • 摘要:
      目的 对华南地区2个速生树种尾巨桉Eucalyptus urophylla×E. grandis和竹柳(bamboo willow)的抗旱性进行比较.
      方法 采用干旱胁迫处理，利用脉冲调制式叶绿素荧光仪(OS5P-美国)对2树种叶绿素荧光参数进行测定.
      结果和结论 在干旱胁迫条件下，实际光量子产量(Yield)、表观光合电子传递速率(ETR)、光化学淬灭系数(qP)、最大荧光(Fm)和PSⅡ最大光化学效率(Fv/Fm)均有不同程度的下降，在干旱处理第24天，尾巨桉ETR比对照下降48.02%，而竹柳仅下降25.12%；到重度干旱时期，尾巨桉和竹柳Fv/Fm分别下降31.55%和21.84%；供试树种的非光化学淬灭系数(qN)、初始荧光(F0)均呈上升趋势，与对照相比，竹柳qN上升幅度为217.59%，显著大于尾巨桉(146.40%，P < 0.05)，F0上升幅度(49.11%)小于尾巨桉(92.03%)；2种树种ETR与土壤含水量均呈极显著正相关(P < 0.01)，尾巨桉F0与土壤含水量呈极显著负相关(P＜0.01), 竹柳Fm和Fv/Fm与土壤含水量呈极显著正相关(P＜0.01).研究结果表明：在干旱胁迫下，竹柳与尾巨桉叶绿素荧光参数间均表现一定相关性，相比尾巨桉，竹柳在叶绿素荧光参数上表现出更强的抗旱性.

       

      Abstract:
      Objective A comparison of drought resistance was made between two fast-growing species in South China, Eucalyptus urophylla×E. grandis (EE for abbr.) and bamboo willow (BW for abbr.).
      Method Effective quantum yield of PSⅡ photochemistry(Yield), apparent electron transport rate(ETR), the photochemical quenching (qP), the non-photochemical quenching (qN), minimal fluorescence(F0), maximal fluorescence(Fm), potential photochemical efficiency of PSⅡ(Fv/Fm) in EE and BW were tested by OS5P pulse modulated chlorophyll fluorometer under drought stress.
      Result and conclusion Yield, ETR, qP, Fm and Fv/Fm all declined during the drought. At day 24 after treatment, ETR declined by 48.02% and 25.12% EE and BW, respectively. qN and F0 in the 2 species increased. qN in BW rose by 217.59%, which was significantly higher than that in EE (146.40%, P < 0.05). The relative increment in F0 in BW (49.11%) was smaller than that in EE (92.03%) at the end of the drought treatment. Correlation analyses were made concerning chlorophyll fluorescence characteristics and soil water content. In both species, ETR showed a significant positive correlation with soil water content (P < 0.01). F0 in EE showed a significant negative correlation with soil water content (P < 0.01). Fm and Fv/Fm of BB and soil water content showed a significant positive correlation (P < 0.01). These results indicate that correlations existe among chlorophyll fluorescence characteristics in two species under drought. BW has greater drought resistance than EE as revealed by chlorophyll fluorescence characteristics.

       

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