木薯幼苗叶绿素含量及光合特性对盐胁迫的响应  

Chlorophyll contents and photosynthetic characteristics of cassava seedlings in response to NaCl stress

作　　者：安飞飞[1] 简纯平[1] 杨龙[2] 陈松笔[1] 李开绵[1] 

机构地区：[1]中国热带农业科学院热带作物品种资源研究所/农业部木薯种质资源保护与利用重点实验室,海南儋州571737 [2]海南大学农学院,海南海口570228

出　　处：《江苏农业学报》2015年第3期500-504,共5页Jiangsu Journal of Agricultural Sciences

基　　金："十二五"农村领域国家科技计划项目(2012AA101204-2);2012年海南省创新创业人才启动基金项目

摘　　要：为研究盐胁迫对不同基因型木薯幼苗叶绿素含量及光合特性的影响,本研究采用水培法对4个木薯品种进行盐胁迫,利用SPAD-502测定胁迫5 d内叶片相对叶绿素含量,LCpro-SD光合仪测定光合特性参数。结果显示:10 g/L Na Cl胁迫降低了4个木薯品种叶片中相对叶绿素含量、净光合速率、气孔导度、蒸腾速率,且均在胁迫5 d时达到最低值;胞间CO2浓度均呈先下降后上升的趋势,在胁迫5 d时达到最大值。由光合特性参数的变化得出随着盐胁迫时间的延长,光合速率下降的原因逐渐由气孔限制转向非气孔限制,叶绿素含量及光合特性参数的变化与木薯基因型抗性密切相关。To study the effect of severe salt stress on chlorophyll content and photosynthetic characteristics of cassava seedlings, four kinds of cassava seedlings were treated with NaCl solution, and the relative chlorophyll contents of leaves and photosynthetic parameters were measured. The results showed that relative chlorophyll contents, net photosynthetic rates, stomatal conductances, transpiration rates of four kinds of cassava subjected to 10 g/L NaCl stress were decreased and reached the lowest on day 5 of salt stress. Intercellular CO2 concentration showed an upward trend following initial de-cline, and reached the maximum on day 5 of salt stress. Stomatal limitation was replaced by non-stomatal limitation as a leading cause for decreased photosynthetic rate over the time of salt stress. Chlorophyll content and photosynthetic parame-ters were closely related to salt tolerance of cassava genotypes.

关 键 词：木薯 盐胁迫 叶绿素含量 光合特性 

分 类 号：S533.034[农业科学—作物学]