光氧化条件下不同水稻品种的CO_2交换与有关酶活性的变化  

Genotypical Differences in C02 Exchange and Enzymatic Activity under Photooxidation Conditions in Rice

作　　者：焦德茂[1] 芮仁廉[1] 葛明治 宋长铣 

机构地区：[1]江苏省农业科学院农业生物遗传生理研究所 [2]江苏省南通师范专科学校 [3]江苏省植物研究所

出　　处：《江苏农业学报》1991年第1期1-6,共6页Jiangsu Journal of Agricultural Sciences

基　　金：农业部;国家自然科学基金资助项目

摘　　要：在光抑制条件(CO_250或60ppm,O_22.5％,光强1050μEm^(-2)s^(-1))下,比较了耐光氧化和不耐光氧化两个水稻品种的CO_2交换特点和有关酶超氧歧化酶SOD,过氧化氢酶Catalase、磷酸烯醇式丙酮酸羧化酶PEPC的活性变化。结果表明:在光氧化处理过程中,耐光氧化品种表现在(1)叶内有较强的小量光合CO_2的固定能力。(图1A);(2)清除活性氧的关键酶SOD被诱导的活性高,并能维持较长的时间;(3)C_4光合关键酶PEPC被诱导的活性高,并能维持较长的时间(图4)。上述这些特性与在逆境下减轻光抑制提高光合生产力密切相关。This paper deals with the genotypical differences in CO2 exchange and activities of SOD, catalase and PEPC in 2 rice cultivars differing in tolerance to photooxidation under photoinhibitory conditions of photosy nthesis with CO2 concentration 50 or 60 ppm, O2 concentration . 2.5% and light intensity 1050μEm-2s-1. The tolerance to photooxidation was characterized by ( 1 ) a higher level of minimal photosynthetic CO2 fixation as reflected in GO2 release under darkness treatment ( Fig. 1A and 1C ) ; ( 2 ) high and long-lasting induced activity of SOD, a key enzyme in scavenging the active oxygen radical ( Fig.2 ) ; ( 3 ) high and long-lasting induced activity of PEPC, a key enzyme in C4 photosynthesis ( Fig.4 ). All these characteristics of photooxidation-tolerant cultivars could be related to the alleviation of photoinhibition and enhancement of photosynthetic productivity.

关 键 词：光氧化 水稻 品种 CO2交换 酶活性 

分 类 号：S511.101[农业科学—作物学]