干旱区生态环境知识资源中心(Arid): 干旱胁迫下外源钙对石灰岩地区复羽叶栾树种子萌发的影响

Arid

	干旱胁迫下外源钙对石灰岩地区复羽叶栾树种子萌发的影响
其他题名	Effects of exogenous Ca~(2+) on the seed germination of Koelreuteria paniculata in limestone area of Southwest China under drought stress
	蔡喜悦; 陈晓德; 李朝政; 刘成
来源期刊	应用生态学报
ISSN	1001-9332
出版年	2013
卷号	24 期号:5 页码:1341-1346
中文摘要	以石灰岩生态恢复优选树种复羽叶栾树种子为试材,采用聚乙二醇（PEG6000）设置0%（CK）、5%、15%、25%、30%模拟石灰岩山区不同干旱环境,以CaCl_2设置0（CK）、15、20、25、30 mmol·L~(-1)为外源钙离子梯度,模拟石灰岩地区的土壤高钙环境,研究不同浓度CaCl_2、PEG及二者交互作用对种子萌发特征的影响.结果表明:单纯CaCl_2作用下,中低浓度的外源钙对复羽叶栾树种子萌发参数无显著影响,而高浓度的外源钙对种子萌发具有抑制作用,中低浓度CaCl2可以增加萌发后幼苗的鲜质量.PEG浓度从0%增至25%,各处理组的种子发芽率、发芽势、发芽指数及活力指数均与对照呈显著递减趋势,幼苗鲜质量明显减小.对各干旱处理组施加一定浓度的外源钙后,中低浓度的CaCl_2可提高种子的萌发特性,而当CaCl_2浓度达到30 mmol·L~(-1)时,种子难以萌发.PEG浓度达到30%时,种子无萌发.施加一定的外源钙可以提高PEG胁迫下幼苗的鲜质量,使幼苗更加适应干旱缺水的环境.
英文摘要	In this paper, different arid environments in the limestone area of Southwest China were simulated by using different concentrations(0%, 5%, 15%, 25%, and 30%) of PEG6000(polyethylene glycol), and a gradient of exogenous Ca~(2+) (0, 15, 20, 25, and 30 mmol, L~(-1) of CaCl_2) was installed to simulate the high calcium soil environments, aimed to study the effects of different concentration PEG6000, CaCl_2, and their interactions on the seed germination characteristics of Koelreuteria bipinnata, one of the preferred species in the ecological restoration in limestone area. Under the action of CaCl_2 alone, medium or low concentration exogenous Ca~(2+) had lesser effect on the seed germination parameters, but high concentration exogenous Ca~(2+) had inhibition effect on the seed germination. Medium or low concentration CaCl_2 could increase the seedling fresh biomass. When the PEG6000 concentration increased from 0% to 25%, the seed germination rate, germination potential, germination index, and vigor index showed a significant decreasing trend, and the seedling fresh biomass decreased remarkably. When certain concentration of exogenous Ca~(2+) was exerted to the drought treatment groups, medium or low concentration CaCl_2 improved the seed germination characteristics, which compensated the loss from drought stress to a certain degree. When the CaCl_2 concentration was up to 30 mmol ? L~(-1), the seeds were hard to germinate. Additionally, no seeds germinated under the condition of PEG with the concentration of 30%. It was suggested that applying definite concentration of exogenous Ca~(2+) could increase the seedling fresh biomass under PEG6000 stress, and make the seedlings more adapt to arid environment.
中文关键词	复羽叶栾树 ; 种子萌发 ; 聚乙二醇 ; 外源钙 ; 干旱胁迫
英文关键词	Koelreuteria paniculata seed germination polyethylene glycol exogenous Ca~(2+) drought stress
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:4950932
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/230407
作者单位	三峡库区, 生态环境教育部重点实验室;;重庆市三峡库区植物生态与资源重点实验室, 重庆 400715, 中国
推荐引用方式 GB/T 7714	蔡喜悦,陈晓德,李朝政,等. 干旱胁迫下外源钙对石灰岩地区复羽叶栾树种子萌发的影响[J],2013,24(5):1341-1346.
APA	蔡喜悦,陈晓德,李朝政,&刘成.(2013).干旱胁迫下外源钙对石灰岩地区复羽叶栾树种子萌发的影响.应用生态学报,24(5),1341-1346.
MLA	蔡喜悦,et al."干旱胁迫下外源钙对石灰岩地区复羽叶栾树种子萌发的影响".应用生态学报 24.5(2013):1341-1346.