干旱区生态环境知识资源中心(Arid): 增强UV-B辐射与干旱复合处理对小麦幼苗生理特性的影响

Arid

	增强UV-B辐射与干旱复合处理对小麦幼苗生理特性的影响
其他题名	The Interactive Effects of Enhanced UV-B Irradiation and Water Deficit on Physiological Properties of Spring Wheat Seedling
	冯虎元; 安黎哲; 陈书燕; 王勋陵; 程国栋
来源期刊	生态学报
ISSN	1000-0933
出版年	2002
卷号	22 期号:9 页码:1564-1568
中文摘要	为研究由于平流层臭氧层减薄紫外线B辐射增强在干旱地区对春上麦生理特性的影响的特殊性，模拟平流层臭氧减少20%时辐射到地表的紫外线B（UV-B，280～315nm）的增强和水分胁迫（-0.5Mpa，聚乙二醇PEG-6000处理获得），通过测定两种胁迫下春小麦（Triticum aestivum L.）叶绿素含量、类黄酮含量、水势、细胞膜相对透性、超氧歧化酶（SOD）活性及丙二醛（MDA）含量，研究了增强UV-B辐射和水分胁迫复合作用对温室种植的小麦幼苗生理生化的影响。实验结果表明，虽然水分胁迫和UV-B辐射单独或复合处理都使春小麦的叶绿素含量降低，但仅UV-B辐射增强单独处理显著地降低小麦叶绿素a、b和总叶绿素的含量，而水分胁迫以及复合处理对叶绿素的含量降低作用不显著。两种胁迫无论是单独作用还是复合作用均能使类黄酮含量升高，并且处理第3天比第1天高出近80%，复合处理下类黄酮的含量大于两个因子单独处理。UV-B辐射和水分胁迫处理1d对春小麦叶片的相对电导率的影响不明显，处理3d后两种胁迫下相对电导率均上升，表明膜透性增加，其中水分胁迫作用下增加尤其明显。膜质过氧化产物丙二醛的含量，在两种因子单独和复合作用下都升高，说明膜的生理功能受到了一定的不利影响。活性氧清除剂超氧化物歧化酶（SOD）的活性在各种处理下，都没有发生改变。虽然增强的UV-B辐射和干旱处理一样，会显著降低植物水势，但是，UV-B辐射与干旱同时处理时叶片水势降低的程度，不但没有比两者分别处理时降低程度之和低，而且比单做干旱处理时的降低程度还低，这表明UV-B辐射和干旱胁迫同时处理时，UV-B辐射不但没有加重水分胁迫，反而减轻了干旱对春小麦生长的胁迫。由此可以认为，在干旱条件下，增强UV-B辐射不会加剧而是有利于提高小麦对干旱的抗性。
英文摘要	The depletion of the stratospheric ozone layer has been well documented, so ultraviolet-B radiation (UV-B) (280～315nm) reaching the earth surface has increased since 1970s. Although extensive studies were done about biological and ecological effects of enhanced UV-B radiation, litter was known about the effect of increased UV-B irradiance and water deficit on plants. In the present paper, the effects of ultraviolet-B irradiation and drought stress alone or combination on contents of chlorophyll, MDA, and flavonoids, water potential, relative leakage ratio and SOD activity in spring wheat (Triticum aestivum L.) seedlings under greenhouse conditions were studied. Supplemental UV-B irradiation stimulated a 20% stratospheric ozone depletion in Lanzhou on summer solstice day. Water stress was produced by adding polyethylene glycol (PEG-6000) to maintain a water potential-0.5MPa. Chlorophyll a and b, and total chlorophyll contents were decreased by enhanced UV-B radiation, drought stress and the two stresses combined had no significant impact on these pigments, Increased UV-B radiation or water deficit applied alone or combined caused an enhancement of flavonoid contents, and the content in third day of treatment after three day, the MDA content was significantly enhanced and water potential reduced by UV-B radiation and/or drought, indicating the increase of membrane permeability and change of physiological function. The effect of combined stresses on water potential was less than that of water stress alone. UV-B radiation, water deficit or all together had no statistically obvious influence on the activity of SOD. The results indicated that the effects of the combination of enhanced UV-B radiation and drought stress may increase the tolerance of wheat seedlings to one of stresses.
中文关键词	UV-B辐射 ; 水份胁迫 ; 小麦 ; 生理特征
英文关键词	UV-B radiation water stress Triticum aesitium physiological properties
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Plant Sciences
CSCD记录号	CSCD:1045621
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/378341
作者单位	冯虎元, 兰州大学生命科学学院, 干旱农业生态国家重点实验室, 兰州, 甘肃 730000, 中国.; 安黎哲, 兰州大学生命科学学院, 干旱农业生态国家重点实验室, 兰州, 甘肃 730000, 中国.; 陈书燕, 兰州大学生命科学学院, 干旱农业生态国家重点实验室, 兰州, 甘肃 730000, 中国.; 王勋陵, 兰州大学生命科学学院, 干旱农业生态国家重点实验室, 兰州, 甘肃 730000, 中国.; 程国栋, 中国科学院寒区旱区环境与工程研究所, 冻土工程国家重点实验室, 兰州, 甘肃 730000, 中国.
推荐引用方式 GB/T 7714	冯虎元,安黎哲,陈书燕,等. 增强UV-B辐射与干旱复合处理对小麦幼苗生理特性的影响[J],2002,22(9):1564-1568.
APA	冯虎元,安黎哲,陈书燕,王勋陵,&程国栋.(2002).增强UV-B辐射与干旱复合处理对小麦幼苗生理特性的影响.生态学报,22(9),1564-1568.
MLA	冯虎元,et al."增强UV-B辐射与干旱复合处理对小麦幼苗生理特性的影响".生态学报 22.9(2002):1564-1568.