华北农学报Issue(4)：150-156,7.DOI:10.7668/hbnxb.2015.04.026
铝胁迫对西瓜幼苗光合及叶绿素荧光特性的影响
Effect of Aluminum Stress on Photosynthetic Characteristics and Chlorophyll Fluorescence Parameters of Watermelon Seedlings
摘要
Abstract
In the study,two watermelon varieties Zaomiwang (ZM)and Zaochunhongyu (HY)seedlings were used as materials to investigate the effect of aluminum(Al)on growth and physiological characteristics under differ-ent Al concentrations (0,250,500,1 000,1 500 μmol /L)treatment in order to find out the impact of aluminum stress on photosynthetic characteristics of watermelon.Changes in root length and biomass results showed that ZM was more sensitive to Al than HY.Effects on photosynthesis for the followed three aspects:Chlorophyll content of HY increased in the Al treatment.Chlorophyll content of ZM was higher than contrast only when Al concentration was 250 μmol /L.Chlorophyll a /b content of HY intended to decrease as long as the Al concentration increased;In the Al treatment,when concentration lower than 500 μmol /L the stomatal conductance (Gs),intercellular CO2 con-centration (Ci),net photosynthetic rate (Pn)and transpiration rate (Tr)of ZM was effected more obviously than those of HY.When Al concentration was above 1 000 μmol /L,the value of these four items all intended to fall down;Changes of Chlorophyll fluorescence in these two watermelon variety in the Al treatment (without Al3 + =250μmol /L concentration)were as follow:original fluorescence (Fo),maximum fluorescence (Fm),potential photo-chemical efficiency (Fv /Fo),photochemical maximum efficiency of PS Ⅱ (Fv /Fm)and the ability of leaves to transform energy Y(Ⅱ)decreased,while non-photochemical quenching (NPQ)increased,and leaves maintained a high actinic light energy distribution by adjusting the heat dissipation;In addition,photochemical quenching coeffi-cient (qP)and electron transport rate (ETR)decreased.At Al3 +≤250 μmol /L concentration,the four parameters of HY:Fo,Fm,Fv /Fo,Fv /Fm was more stable;with aluminum concentration increases,the electron transfer rate was less affected,NPQ relatively constant,that is able to maintain a constant light protection.关键词
西瓜/铝胁迫/光合特性/叶绿素荧光参数Key words
Citrullus lanatus/Aluminum stress/Photosynthetic characteristics/Chlorophyll fluorescence parameters分类
农业科技引用本文复制引用
郑阳霞,贾松涛,赵英鹏,张伟伟,孙远秀,邱爽..铝胁迫对西瓜幼苗光合及叶绿素荧光特性的影响[J].华北农学报,2015,(4):150-156,7.基金项目
四川省教育厅重点项目 （）
