遮光对不同基因型玉米光合特性的影响  

Effects of shading on photosynthetic characteristics of different genotype maize

作　　者：李潮海[1] 赵亚丽[1] 杨国航[2] 栾丽敏[1] 王群[1] 李宁[1] 

机构地区：[1]河南农业大学农学院,郑州450002 [2]北京市农林科学院,北京100089

出　　处：《应用生态学报》2007年第6期1259-1264,共6页Chinese Journal of Applied Ecology

基　　金：河南省"九五"重点科技攻关项目(960201019);北京市"超级玉米种质创新及中国玉米DNA指纹库构建"资助项目(VZPT0204)

摘　　要：采用盆栽试验,研究了遮光对4个基因型玉米光合特性的影响.结果表明:4个基因型玉米叶片的光饱和点、净光合速率(Pn)、电子传递速率(ETR)、光系统Ⅱ最大光化学效率(Fv/Fm)和实际光化学效率(ΦPSⅡ)均受光强的影响.遮光降低了玉米的光饱和点,苗期遮光处理豫玉2号和丹玉13分别在光量子通量密度(PFD)为1400μmol·m-2·s-1和1100μmol·m-2·s-1时达到饱和.遮光还降低了玉米的Pn、ETR、Fv/Fm和ΦPSⅡ,但不同基因型玉米表现不同,豫玉2号和掖单22的下降幅度较小,而丹玉13和掖单6号的下降幅度较大.A pot experiment with 4 genotype maize varieties showed that light intensity had strong effects on their leaf light saturation point, diurnal variation of net photosynthetic rate （Pn）, estimated electron transport rate （ETR）, maximal photochemical efficiency of PS Ⅱ （Fv/Fm ）, and actual photochemical efficiency of PS Ⅱ （ ΦPS Ⅱ ）. Under shading, the light saturation point of test varieties decreased. For example, shading at seedling stage made the varieties Yuyu 2 and Danyu 13 get to light-saturated when the photon flux density （PFD） was 1 400 μmol·m^-2·s^-1 and 1 100 μmol·m^-2·s^-1, respectively. Shading also decreased the Pn, ETR, Fv/Fm and ΦPSⅡ , but the responses differed with the varieties. The decrement of these parameters was remarkably lesser for Yuyu 2 and Yedan 22 than for Danyu 13 and Yedan 6.

关 键 词：玉米 遮光 光合特性 净光合速率 

分 类 号：S513[农业科学—作物学]