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张教林, 曹坤芳. 夜间低温对2种热带雨林树种幼苗叶绿素荧光的影响[J]. 植物科学学报, 2003, 21(4): 356-360.
引用本文: 张教林, 曹坤芳. 夜间低温对2种热带雨林树种幼苗叶绿素荧光的影响[J]. 植物科学学报, 2003, 21(4): 356-360.
ZHANG Jiao-Lin, CAO Kun-Fang. The Effects of Night Chilling on Chlorophyll Fluorescence in Seedlings of Two Tropical Rain Forest Tree Species[J]. Plant Science Journal, 2003, 21(4): 356-360.
Citation: ZHANG Jiao-Lin, CAO Kun-Fang. The Effects of Night Chilling on Chlorophyll Fluorescence in Seedlings of Two Tropical Rain Forest Tree Species[J]. Plant Science Journal, 2003, 21(4): 356-360.

夜间低温对2种热带雨林树种幼苗叶绿素荧光的影响

The Effects of Night Chilling on Chlorophyll Fluorescence in Seedlings of Two Tropical Rain Forest Tree Species

  • 摘要: 研究了夜间低温(5℃±1℃,12h,连续3个晚上)对生长于3种光照条件下(100%、25%和8%光照)的热带雨林冠层树种绒毛番龙眼(Pometiatomentosa)和中层树种滇南风吹楠(Horsfieldiatetratepala)幼苗叶绿素荧光的影响。结果表明:低温处理使生长于全光下的绒毛番龙眼幼苗的Fv/Fm(PSII最大光化学量子产量)急剧降低,中午发生了强烈的光抑制,但随着低温胁迫的解除Fv/Fm能很快恢复,表明没有发生不可逆的光氧化损伤。低温使生长于全光和25%光照条件下2个树种幼苗的NPQ(非光化学猝灭,热耗散)受到抑制,但没有引起2个树种幼苗Fo(初始荧光)的升高,不会导致幼苗PSII反应中心的失活。2种热带雨林植物对低温的抗性可能与这些植物的地理分布和历史渊源有关。

     

    Abstract: In this study, the effect of night chilling (5℃±1℃, 12 hours at night, for three consecutive nights) on chlorophyll fluorescence in leaves of two tropical rain forest tree species was examined. Seedlings of Pometia tomentosa (Sapindaceae), a canopy species,and Horsfieldia tetratepala (Myristicaceae), a middle layer species, were nursed under three light regimes (full, 25% and 8% daylight) in the Xishuangbanna Tropical Botanical Garden. More severe photoinhibition at noon resulted from the night chilling was observed in P. tomentosa seedlings grown under full daylight. However, this photoinhibition was recovered rapidly after termination of the chilling treatment, indicating that no irreversible photooxidation damage occurred. In addition, heat dissipation, as indicated by non-photochemical quenching (NPQ), in the seedlings of both species grown under 25% and full daylight conditions were suppressed by night chilling, but there was no increase in Fo(Initial fluorescence) value in both species, suggesting no inactivation of PSII reaction centers. Our results support the observations in the field that native tropical rain forest plants are usually not injured when severe cold wind affects the region. Resistance of native tropical plants to chilling is consistent with their geographical distribution.

     

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