低钾胁迫对玉米自交系苗期叶绿体结构及光合响应影响  

The Effect of Chloroplast Construction and Photosynthetic Rate of Response Curve of Maize Seedling in Inbred Lines Under Low Potassium Stress

作　　者：田晓艳[1] 刘延吉[2] 曹敏建[2] 

机构地区：[1]辽宁石油化工大学环境与生物工程学院,辽宁抚顺113001 [2]沈阳农业大学生物科学技术学院,沈阳110161

出　　处：《玉米科学》2007年第4期79-82,共4页Journal of Maize Sciences

基　　金：国家重点基础研究发展计划(973计划)(G1999011707)

摘　　要：研究低钾胁迫对玉米苗期叶绿体结构及光合响应的影响。玉米自交系种子A(不耐低钾)和B(耐低钾)以3个不同钾离子浓度(5μmol/L,100μmol/L,1000μmol/L)进行液体培养,连续培养50天。测定其叶绿体形态结构,光强、CO2、温度对光合响应曲线。低钾处理初期,B叶绿体基粒数多于A,并且片层密度加厚;低钾处理后期,B与A叶绿体结构与形态趋向一致。B的CO2饱和点上升、光饱和点上升,CO2同化能力增加及光能利用率、温度效应增加。低钾胁迫时,耐低钾自交系B通过叶绿体基粒数增多,净光合速率升高,CO2饱和点、光饱和点上升,CO2同化能力及光能利用率、温度效应增加,提高其光合作用,从而适应低钾胁迫。The article studied the effect of chloroplast construction and photosynthetic rate of response curve in maize seedling under low potassium stress. Two inbred lines of maize seed, A which sensitive to K＋ deficiency and B which tolerant to K＋ deficiency were cultured in nutrient solutions of three different K＋ concentration （5, 100, 1 000 μmol/L）, then continued to culture for 50 days. Assayed chloroplast construction and photosynthetic rate of response curve to photo intensity, to CO2 and to temperature. The results showed that grana of chloroplast of B increased rapidly than of A, and the density of lamella of B was more thick than of A at the initial period of the process. The construction and morph inclined to be consistent between B and A at the later period. The CO2 saturation point and light saturation point of B ascended and CO2 assimilatory ability, efficienecy of light energy utilization and temperature effect increased. The results indicated that B improved .its photosynthesis through increasing grana of chloroplast, net photossynthetic rate, CO2 saturation point, light . saturation point, CO2 assimilatory ability, efficienicy of light energy utilization and temperature effect, so that to be adapt loy-potassium stress.

关 键 词：低钾胁迫 玉米自交系 叶面积 叶绿体 光强 光合响应 

分 类 号：S513.01[农业科学—作物学]