不同抗性甘薯品种感染疮痂病后光合机理的研究  

Studies on photosynthesis of sweet potato under the stress of sweet potato scab

作　　者：余文英[1] 潘廷国[1] 柯玉琴[1] 王湘平[1] 艾育芳[1] 

机构地区：[1]福建农林大学生命科学学院,福州350002

出　　处：《中国生态农业学报》2006年第4期161-164,共4页Chinese Journal of Eco-Agriculture

基　　金：福建省自然科学基金项目(B0210013)资助

摘　　要：研究了田间栽培条件下感病薯种“金山1255”和抗病薯种“广薯88-70”染甘薯疮痂病后的光合机理。结果表明,染病后感、抗病品种叶绿素均被降解,叶片膜不饱和脂肪酸含量、不饱和指数、叶绿体膜流动性均降低,叶绿体Ca2+-ATP酶和Mg2+-ATP酶活性均下降,气孔导度、净光合效率、蒸腾速率均下降,但感病品种下降幅度比抗病品种大;胞间CO2浓度在抗病品种中下降,而在感病品种中略有上升;感、抗病品种的叶绿体超微结构都发生了变化,但感病品种受到的伤害程度远大于抗病品种。Two sweet potato varieties with different responses to sweet potato scab stress （＂Guangshu 88-70＂, a diseaseresistant variety;＂Jinshan 1255＂, a disease-sensitive variety） were used as experimental materials to study the metabolism of photosynthesis of plants under sweet potato scab stress in field experiment. Under sweet potato scab stress, chlorophyll is decomposed;the contents of unsaturated membrane fatty acids, the index of the unsaturated fatty acids, and the membrane fluidity decrease. The activities of Mg^2＋ -ATPase and Ca^2 ＋ -ATPase of chloroplast decrease. But two sweet potato varieties own different decreasing rate of activities of ATPase. On the other hand, the stomatal conductance, net photosynthetic rate and transpiration rate decrease to different degrees. Intercellular CO2 concentration of sensitive variety increases to a little degree and that of resistant variety decrease. The ultrastructure of chloroplast of disease-sensitive variety is much more decomposed than that of disease-resistant variety.

关 键 词：甘薯 疮痂病 光合代谢 超微结构 

分 类 号：S54[农业科学—作物学]