干旱区生态环境知识资源中心(Arid): 小叶锦鸡儿和狭叶锦鸡儿的光合特性及保护酶系统比较

Arid

	小叶锦鸡儿和狭叶锦鸡儿的光合特性及保护酶系统比较
其他题名	The comparison studies of photosynthetic characteristics and protective enzymes of Caragana microphylla and Caragana stenophylla
	马成仓; 高玉葆; 王金龙; 郭宏宇; 聂莉莉; 赵娟
来源期刊	生态学报
ISSN	1000-0933
出版年	2004
卷号	24 期号:8 页码:1594-1601
中文摘要	对锦鸡儿属羽状叶类群的代表植物--小叶锦鸡儿(Carag ana microphylla)和假掌状叶类群的代表植物--狭叶锦鸡儿(Caragana stenophyll a)的光合特性和保护酶系统进行了比较研究.小叶锦鸡儿的光补偿点(217 mumol photo n/(m2·s))、光饱和点(1107mumol photon/(m2·s))、光合最适温度(25.65℃) 均低于狭叶锦鸡儿(光补偿点,342mumol photon/(m2·s);光饱和点,1444mumol phot on/(m2·s);光合最适温度,32.89℃),前者在低温、低光强下表现出更高的光合速率 .小叶锦鸡儿净光合速率表现出随空气相对湿度增大而升高趋势,而狭叶锦鸡儿则在空气相对湿度为80%～90%时,净光合速率达到最大.这说明狭叶锦鸡儿光合系统对强辐射、高温和干旱环境的适应能力大于小叶锦鸡儿,小叶锦鸡儿对低辐射的利用能力高于狭叶锦鸡儿.狭叶锦鸡儿净光合速率和光能利用效率日进程午后高于小叶锦鸡儿,表明狭叶锦鸡儿的保水能力好于小叶锦鸡儿.小叶锦鸡儿LUE日平均值(8.17mmolCO2/mol photon)大于狭叶锦鸡儿(7.08 mmolCO2/mol photon),表明小叶锦鸡儿对低光强环境适应能力强.这些光合特性正好与它们分布区的光、温、湿条件相适应.从光合特性来看,狭叶锦鸡儿比小叶锦鸡儿更适于在光辐射充足、气温较高、降水更少的环境下生长.狭叶锦鸡儿有较高的POD和S OD活性,导致其自由基含量、MDA含量和细胞膜相对透性小于小叶锦鸡儿,这是狭叶锦鸡儿适应其干旱、高温、强辐射环境的重要特性.狭叶锦鸡儿叶细胞游离脯氨酸含量小于小叶锦鸡儿,也说明狭叶锦鸡儿对干旱的适应性强.结果表明:(1)锦鸡儿属植物是以光合特性和抗氧化系统的变异来适应它们的光、温、湿环境的.(2)假掌状叶的代表植物--狭叶锦鸡儿比羽状叶的代表植物--小叶锦鸡儿对干旱、高温、强辐射的适应性强.这一研究结果似可以作为羽状叶是原始类群、假掌状叶是较进化类群观点的证据.
英文摘要	The photosynthetic characteristics and protective enzymes of Caragana microphylla a typical species of pinnately compound leaf group, and Caragana stenophylla a typical species of pseudo-palmately compound leaf group, were compared and studied in this paper, in order to understand their adaptation mechanism to its habitat and to provide experimental evidence for specific evolution of genus Caragana. The research of photosynthetic characteristics showed that light compensation point (217 mol photon/cm~2·s)), light saturation point (1107ftmol photon/(m~2 · s)) and optimum temperature for photosynthesis (25. 65 C) of C. microphylla were all lower than those of C. stenophylla (light compensation point: 342/imol photon/(m2 · s); light saturation point; 1444/mol · photon/cm2 · s); optimum temperature for photosynthesis: 32. 89 C). The C. micruphylla exhibited a higher photosynthesis rate at lower temperature and lower light intensity. The net photosynthesis rate of C. mkrophylla rose as air humidity increased while C. stenophylla reached its maximum net photosynthesis rate at air humidity of 80 %~ 90%. These suggested that a photosynthetic system of C. stenophylla adapted better to higher temperature, more intensive radiation and more arid environment than that of C. microphylla, and C. mkrophylla could use low radiation more effectively. The photosynthesis rate and LUE of C. stenophylla were higher than those of C. microphylla after noon, which suggested that water retention of C. stenophylla was superior to that of C. microphylla. The fact that the daily average value of LUE of C. microphyllaii,. 17mmol COz/mol photoniwas more than that of C. stenophylla (7. 08 mmolCO2/mol photon) enabled C. microphylla to exhibit better adaptation to lower radiation. These photosynthetic characteristics of the plants adapted to the light, temperature and humidity conditions of these plants own habitats. In terms of photosynthetic characteristics, C. stenophylla favored living in an environment of higher temperature, more intensive light radiation and less rain than C. microphylla, which might explain the present distribution characteristics of these two species of plants. There were not significant differences between C. stenophylla and C. microphylla in chlorophyll content and the ratio of chlorophyll a to chlorophyll b, which revealed that they take the variation of the chlorophyll function photosynthetic characteristics but not chlorophyll content as an adaptation strategy to the environment. The comparison of stress resistance showed that C. stenophylla had higher POD and SOD activities, resulting in the free radical content, membrane lipid peroxidation (MDA content) and the permeability of the plasma membrane was lower than those of C. microphylla. This was an important characteristic of C. stenophylla adaptation to the environment of drought, high temperature and intensive light radiation. The proline content in the leaf cell of C. stenophylla was lower than that of C. microphylla where the water status of C. stenophylla distribution region was significantly lower than that of C. microphylla distribution region. This demonstrated that C. stenophylla adapted to arid environment better than C. microphylla. From this study, we arrived at two main conclusions: (1) Plant of genus Caragana adapts to light, temperature, and humidity environments by means of the variation of photosynthetic characteristics and protective enzymes systems,’ (2) The typical species of the pseudo-palmately compound leaf group, C. stenophylla, adapts to arid, high temperature and intensive radiation environments better than the typical species of the pinnately compound leaf group, C. microphylla. These results provide proof of the view that the pinnately compound leaf group is the basic species and pseudo-palmately compound leaf group is the comparatively evolved species.
中文关键词	小叶锦鸡儿 ; 狭叶锦鸡儿 ; 光合特性 ; 保护酶 ; 叶绿素含量 ; 环境适应性 ; 物种演化 ; 羽状叶类群 ; 假掌状叶类群
英文关键词	C. microphylla C. stenophylla photosynthetic characteristics protective enzymes chlorophyll content environmental adaptation specific evolution pinnately compound leaf group pseudo-palmately compound leaf group
语种	中文
国家	中国
收录类别	CSCD
WOS类目	PLANT SCIENCES
WOS研究方向	Plant Sciences
CSCD记录号	CSCD:1811500
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/205370
作者单位	南开大学生命科学学院, 天津 300071, 中国
推荐引用方式 GB/T 7714	马成仓,高玉葆,王金龙,等. 小叶锦鸡儿和狭叶锦鸡儿的光合特性及保护酶系统比较[J],2004,24(8):1594-1601.
APA	马成仓,高玉葆,王金龙,郭宏宇,聂莉莉,&赵娟.(2004).小叶锦鸡儿和狭叶锦鸡儿的光合特性及保护酶系统比较.生态学报,24(8),1594-1601.
MLA	马成仓,et al."小叶锦鸡儿和狭叶锦鸡儿的光合特性及保护酶系统比较".生态学报 24.8(2004):1594-1601.