遮荫下高原濒危药用植物川贝母(Fritillaria cirrhosa)光合作用和叶绿素荧光特征

被引：107

作者：

李西文

陈士林

机构：

[1] 中国医学科学院中国协和医科大学药用植物研究所

来源：

生态学报 | 2008年 / 07期

关键词：

川贝母(Fritillaria cirrhosa); 遮荫; 光适应; 叶绿素荧光; 热耗散;

D O I：

暂无

中图分类号：

S567.231 [];

学科分类号：

摘要：

测量了川贝母遮荫和全光下叶片光合生理参数和叶绿素荧光参数,探讨了其遮荫下生理生态学指标的变化和强光下的光适应机制,且对光合生理的测量过程给出了全面系统的介绍。川贝母日光合曲线呈双峰变化,遮荫后川贝母光合效率(Pmax)、细胞内CO2浓度(Ci)分别增加了31.1%、10%(p<0.01),有效光反应光强域值(PFD)增加了331.5[μmol/(m2.s)],最大表观量子效率(AQY)和气孔导度(COND)也有所增加,暗呼吸速率(Rd)和叶片蒸汽压亏缺(Vpdl)明显降低,此均有利用光合产物的积累;F′v/F′m(光照下反应中心能量捕获效率)、qP(光化学淬灭)、ETR(电子传递效率)、Psips2(PSⅡ的效率)分别增加了14.7%(p<0.01)、8.8%(p<0.01)、10%(p<0.01)、24.2%(p>0.05),促进了川贝母叶片对光能的利用;Fv/Fm(光化学效率)变化不明显,说明"灯笼花"阶段,全光下川贝母没有受到到明显的胁迫,光合机构未遭到破坏。当自然光强超过光饱和点时,川贝母主要通过提高非化学淬灭,耗散过多吸收的热能以防止光合机构的破坏。当出现极端气候(高温干旱)时,川贝母繁育退化现象("树儿子"或"灯笼花"阶段退回到"一匹叶"生长阶段)可能是对环境适应的主要方式。另外川贝母叶片狭小、叶片倾角较大降低了强光辐射的有效面积,在形态结构上有利于避免过高光强对叶光合器官的损伤。

引用

页码：3438 / 3446

页数：9

共 18 条

[1]

Diurnal and Seasonal Changes in Photosynthesis and Photosystem 2 Photochemical Efficiency in <Emphasis Type="Italic">Prosopis juliflora</Emphasis> Leaves Subjected to Natural Environmental Stress.[J].P.A. Shirke;U.V. Pathre.Photosynthetica.2003, 1

[2]

Compensation for herbivory by Cucumis sativus through increased photosynthetic capacity and efficiency [J].

Thomson, VP ;

Cunningham, SA ;

Ball, MC ;

Nicotra, AB .

OECOLOGIA, 2003, 134 (02) :167-175

[3]

Acclimation of leaf anatomy, photosynthetic light use, and xylem hydraulics to light in Amborella trichopoda (Amborellaceae) [J].

Feild, TS ;

Brodribb, T ;

Jaffré, T ;

Holbrook, NM .

INTERNATIONAL JOURNAL OF PLANT SCIENCES, 2001, 162 (05) :999-1008

[4]

Changes in chlorophyll fluorescence during exposure of Dunaliella tertiolecta to UV radiation indicate a dynamic interaction between damage and repair processes [J].

Heraud, P ;

Beardall, J .

PHOTOSYNTHESIS RESEARCH, 2000, 63 (02) :123-134

[5]

Factors determining the midday depression of photosynthesis in trees under monsoon climate [J].

Pathre, U ;

Sinha, AK ;

Shirke, PA ;

Sane, PV .

TREES-STRUCTURE AND FUNCTION, 1998, 12 (08) :472-481

[6]

Photoinhibitory damage is modulated by the rate of photosynthesis and by the photosystem II light-harvesting chlorophyll antenna size [J].

Baroli, I ;

Melis, A .

PLANTA, 1998, 205 (02) :288-296

[7]

Relative importance of photosynthetic traits and allocation patterns as correlates of seedling shade tolerance of 13 tropical trees.[J].Kaoru Kitajima.Oecologia.1994, 3

[8]

Interspecific variation in the growth response of plants to an elevated ambient CO2 concentration.[J].Hendrik Poorter.Vegetatio.1993, 1

[9]

Sunflecks and Photosynthesis in Plant Canopies.[J].R W Pearcy.Annual Review of Plant Physiology and Plant Molecular Biology.1990, 1

[10]

PHOTON YIELD OF O-2 EVOLUTION AND CHLOROPHYLL FLUORESCENCE CHARACTERISTICS AT 77-K AMONG VASCULAR PLANTS OF DIVERSE ORIGINS [J].

BJORKMAN, O ;

DEMMIG, B .

PLANTA, 1987, 170 (04) :489-504

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