干旱胁迫对真桦光合特性及渗透调节物质含量的影响  

Effects of Drought Stress on Photosynthesis & Content of Osmoregulation Substance for Betula maximowicziana

作　　者：王晓冬[1] 李蕴峰[1] 刘宇明[2] 

机构地区：[1]黑龙江省森林植物园,黑龙江哈尔滨150040 [2]哈尔滨游乐园

出　　处：《防护林科技》2012年第1期25-27,共3页Protection Forest Science and Technology

摘　　要：以真桦盆栽幼苗为试材,研究干旱胁迫对真桦叶片光合作用和渗透调节物质含量的影响。结果表明:干旱胁迫使真桦幼苗净光合速率、蒸腾速率和气孔导度显著降低,降低幅度随胁迫程度的加剧而加大。胁迫初期,轻度和中度干旱胁迫组真桦幼苗净光合速率降低的同时气孔导度和胞间CO2浓度同时降低,光合速率降低的主要原因是气孔因素;胁迫中期和后期,各干旱处理组光合速率降低的同时胞间CO2浓度均显著升高,非气孔限制是净光合速率降低的主要原因。真桦在干旱胁迫过程中,可溶性蛋白变化不显著,可溶性糖含量增加,为主要的渗透调节物质。Using potted seedlings of Betula maximowicziana as material,an experiment was conducted to study the effects of drought stress on photosynthesis content of osmoregulation substance.Result shows that： net photosynthetic rate（P_n）,transpiration rate,stomatal conductance（G_s） in seedlings of B.maximowicziana were significantly decreased by drought stress;decreased range increase with the increased levels of stress.At initial stage of the stress,G_s intercellular CO_2 content（C_i） decrease with the decrease of the P_n in group of slight or medium drought stress;photosynthesis reduction is mainly due to stomatal factor;for the metaphase or late stage,a decreasing P_n with higher C_i indicated that non-stomatal factor is the leading limitation.Soluble sugar in seedlings of B.maximowicziana increased under soil moisture stress,but non-significant change in soluble protein;soluble sugar is the main osmoregulation substance.

关 键 词：真桦 干旱胁迫 光合特性 渗透调节物质 

分 类 号：S792.150.2[农业科学—林木遗传育种]