低温弱光对辣椒叶片光合特性和生理特性的影响  

Effects of Photosynthesis Characteristics and Physiological Characteristics of Pepper Seedlings under Low Temperature and Weak Light Stress

作　　者：聂书明[1] 杜中平[1] 王丽慧[1] 徐海勤[1] 

机构地区：[1]青海省农林科学院园艺研究所/青海省蔬菜遗传与生理重点实验室,青海西宁810016

出　　处：《西南农业学报》2016年第10期2319-2323,共5页Southwest China Journal of Agricultural Sciences

基　　金：青海大学中青年科研基金项目"低温弱光胁迫对辣椒光合荧光特性及生理特性的影响研究"(2013-QNY-7)

摘　　要：本文以辣椒幼苗为材料,研究了低温弱光(16℃/4℃,100μmol·m^(-2)·s^(-1))和低温(16℃/4℃,300μmol·m^(-2)·s^(-1))对辣椒叶绿素含量、光合作用、叶绿素荧光参数和生理特性的影响。结果表明,当低温弱光或低温处理时,叶片叶绿素含量、净光合速率(P_n)、蒸腾速率(T_r)、初始荧光(F_o)、最大荧光(F_m)、最大光化学效率(F_v/F_m)和光化学猝灭系数(qP)都降低,但叶片胞间CO_2浓度(C_i)增大;随着低温弱光或低温处理时间的延长,降低越明显,且低温弱光处理下降幅度更大。不同的处理下,叶片MDA含量先降低后升高,低温弱光处理下MDA含量高于低温处理,叶片SOD和Pro含量都先升高后降低。综合分析表明,低温弱光处理对辣椒造成的伤害比低温处理更为严重。Taken pepper seedlings as tested materials, the effects of low temperature and weak light （16℃/4℃,100μmol·m^-2·s^-1） and low temperature （16℃/4℃,300μmol·m^-2·s^-1） stress on the chlorophyll content,gas exchange parameters,chlorophyll fluorescence parameters and physiological characteristics of pepper seedlings leaves were studied. The results showed that total chlorophyll （ Chl T） content, photosynthetic rate （ Pn ）, transpiration rate （ Tr ）, initial fluorescence （ Fo ）, maximum fluorescence （ Fm ）, the maximum photo- chemical efficiency （Fv/Fm） and photochemical quenching coefficient（qP） of pepper seedling leaves were declined, but intercellular CO2 concentration（ Ci ） was increased under low temperature and weak light or low temperature stress. With the extension of processing time, the reduction of various indexs of low temperature and weak light were more serious than that of low temperature stress. Under different treatments, the MDA contents of pepper leaves were decreased firstly and then increased, MDA contents under low temperature and weak light were higher than that under low temperature stress, and SOD and Pro contents of leaves pepper were firstly increased and then decreased. Comprehensive analysis showed that the damage of pepper seedling by low temperature and weak light treatment were more serious than that by low temperature treatment.

关 键 词：低温弱光 辣椒 光合特性 生理特性 

分 类 号：S63[农业科学—蔬菜学]