干旱区生态环境知识资源中心(Arid): CO_2浓度倍增及干旱胁迫对紫花苜蓿光合生理特性的协同影响

Arid

	CO_2浓度倍增及干旱胁迫对紫花苜蓿光合生理特性的协同影响
其他题名	Synergistic Effects of Doubled CO_2 Concentration and Drought Stress on the Photosynthetic Characteristics of Medicago sativa
	樊良新; 刘国彬; 薛萐; 杨婷; 张昌胜
来源期刊	草地学报
ISSN	1007-0435
出版年	2014
卷号	22 期号:1 页码:85-93
中文摘要	为探讨CO_2浓度倍增和干旱胁迫对紫花苜蓿(Medicago sativa)生理作用的协同效应,采用人工气候室和控水试验模拟CO_2浓度倍增和干旱胁迫,分析了植物光合和抗逆生理特征的变化规律。结果表明:干旱胁迫与CO_2浓度倍增对苜蓿光响应参数影响显著,二者之间具有一定的交互作用,在干旱胁迫下,CO_2浓度倍增减缓了苜蓿叶片气孔导度(G_s)、蒸滕速率(T_r)和光饱和点(LSP)的降低幅度,而对最大净光合速率(P_(max))、胞间CO_2浓度(C_i)和表观量子效率(AQE)没有减缓作用。CO_2浓度倍增下的水分利用效率(WUE)高于正常CO_2浓度,而与水分含量关系不大。干旱胁迫与CO_2浓度倍增对苜蓿光合色素、丙二醛(MDA)和脯氨酸(Pro)含量影响显著,干旱胁迫在一定程度上降低了叶绿素a(chl a)、叶绿素b(chl b)的含量和叶绿素总量,显著增加了叶片MDA和Pro含量,CO_2浓度倍增有增加这些光合色素含量、降低MDA和Pro的趋势;但2个因素之间没有显著交互作用。干旱胁迫和 CO_2浓度倍增对苜蓿叶绿素荧光参数影响不一,干旱胁迫和CO_2浓度倍增对叶绿素荧光参数具有较强的交互作用,CO_2浓度倍增对植物体光合电子传递过程中的保护作用在植物受到干旱胁迫时更加明显。因此,在干旱、半干旱地区,干旱胁迫对苜蓿光合生理功能产生不利的影响,而CO_2浓度倍增对苜蓿的生长具有一定的施肥效应,当2个因素共同发生时,CO_2浓度倍增可以减缓水分胁迫对苜蓿的伤害,增强其抗旱能力,提高水分利用效率,缓解干旱胁迫的负面效应。
英文摘要	In order to study the photo-physiological characteristics of Medicago sativa in the loess hilly-gully region under different water stress and CO_2 concentration,the photosynthetic and physiological characteristics of plant were analyzed with different scenarios using artificial climate chamber and water control simulation. Results showed that the photo-physiological characteristics of alfalfa were significantly affected by drought stress and doubled CO_2 concentration,and there were synergistic effects between them. Under drought stress, the doubled CO_2 concentration improved G_s, T_r and LSP, but had no effect on P_(max), C_i and AQE, as compared with those under ambient CO_2 concentration. The water use efficiency (WUE) under double CO_2 concentration was higher than under normal CO_2 concentration, but had no significant correlation with moisture content. Drought stress and doubled CO_2 concentration had significantly effects on photosynthetic pigment,malondialdehyde (MDA) and proline (Pro). Drought stress,to a certain extent, decreased the chlorophyll a (chl a),chlorophyll b (chl b) and the total chlorophyll contents,while increased significantly the MDA and Pro contents of plant. Doubled CO_2 concentration decreased the photosynthetic pigment contents of plant,and improved the MDA and Pro contents of plant. However, there were no significant synergistic effects between them. Drought stress and double CO_2 concentration had different effects on the fluorescence parameters of chlorophyll,and there was a strong synergistic effect between them. Under drought stress,doubled CO_2 concentration had more obvious protection on the photosynthetic electron transport in the plants. Therefore,the above results indicated that in arid and semi-arid area, doubled CO_2 concentration had definite compensation effects on the photosynthetic physiological functions of alfalfa induced by drought stress, and enhanced drought resistance capacity, improved water use efficiency and alleviated the negative effects of drought stress on alfalfa.
中文关键词	紫花苜蓿 ; 光合生理特性 ; CO_2浓度倍增 ; 干旱胁迫 ; 协同效应
英文关键词	Medicago sativa Photo-physiological characteristics Doubled CO_2 concentration Drought stress Synergic effect
类型	Article
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:5070525
来源机构	西北农林科技大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230817
作者单位	樊良新, 西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国.; 刘国彬, 西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国.; 薛萐, 西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国.; 杨婷, 西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国.; 张昌胜, 西北农林科技大学资源环境学院, 杨凌, 陕西 712100, 中国.
推荐引用方式 GB/T 7714	樊良新,刘国彬,薛萐,等. CO_2浓度倍增及干旱胁迫对紫花苜蓿光合生理特性的协同影响[J]. 西北农林科技大学,2014,22(1):85-93.
APA	樊良新,刘国彬,薛萐,杨婷,&张昌胜.(2014).CO_2浓度倍增及干旱胁迫对紫花苜蓿光合生理特性的协同影响.草地学报,22(1),85-93.
MLA	樊良新,et al."CO_2浓度倍增及干旱胁迫对紫花苜蓿光合生理特性的协同影响".草地学报 22.1(2014):85-93.