作　　者： ; ; ; (黄子锋）;

机构地区： 华南农业大学生命科学学院

出　　处： 《西南师范大学学报（自然科学版）》 2016年第2期53-57,共5页

摘　　要： 以一品红为试验材料,进行0.1mmol/L SA预处理、干旱胁迫以及复水处理,分析一品红叶片相对电导率、丙二醛(MDA)质量摩尔浓度、过氧化氢(H_2O_2)质量摩尔浓度、叶绿素荧光参数和水分状况等生理变化,研究水杨酸(SA)在干旱胁迫条件下对一品红盆花生理特性的影响.结果表明:在干旱胁迫期间,SA处理可延缓一品红叶片相对电导率、水分饱和亏(WSD)、光系统Ⅱ(PSⅡ)的初始叶绿素荧光(F0),H_2O_2质量摩尔浓度和MDA质量摩尔浓度等的增加以及相对含水量(RWC)、最大光化学效率(Fv/Fm)的降低;复水4d后,SA处理的各指标恢复能力均强于单一干旱胁迫的处理.因此,外源SA处理可以提高一品红在干旱胁迫及复水条件下的保水能力及光合效率、减轻细胞膜脂过氧化,有效缓解干旱逆境对一品红的伤害. Taking the seedlings of Euphorbia pulcherrima Willd as test materials,apot-cultivation experiment has been conducted to investigate effects of salicylic acid（SA）on physiological characteristics of E.pulcherrima Willd,such as relative conductivity,malonaldehyde（MDA）content,hydrogen peroxide（H2O2）content,chlorophyll fluorescence parameters and water status.The materials have been treated with 0.1mmol/L salicylic acid（SA）before drought stress（SA＋DS）,as compared to the leaves in the plants treated with drought stress alone（DS）and non-drought as the control（CK）.The results show that with drought stress,SA treatment delayed the increase of relative conductivity,water saturation deficit（WSD）,PSⅡ original fluorescence（Fo）,H2O2 content and MDA content,and the decrease of relative water content（RWC）and maximal photochemical efficiency（Fv/Fm）of the leaves.The physiological status of the SA＋DS treated plants almost recovered to the status of the CK plants after rehaydration,while the plants treated by drought stress alone could not recover.These results demonstrate that exogenous salicylic acid treatment has improved water retaining capacity and photosynthetic efficiency,lightened membrane lipid peroxidation under the condition of drought stress and rehydration,and thus effectively alleviated the damage of drought stress on E.pulcherrima Willd.

关 键 词： 一品红 水杨酸 干旱胁迫 生理特性

领　　域： [农业科学] [农业科学]