干旱区生态环境知识资源中心(Arid): 胡杨种子萌发对温光条件和盐旱胁迫的响应特征

Arid

	胡杨种子萌发对温光条件和盐旱胁迫的响应特征
其他题名	Response of Seed Germination to Temperature and Light Conditions,and Stresses of Salt and Drought in Populus euphratica
	张肖 1; 王瑞清 2; 李志军 1
来源期刊	西北植物学报
ISSN	1000-4025
出版年	2015
卷号	35 期号:8 页码:1642-1649
中文摘要	以胡杨(Populus euphratica)种子为材料,分别设置光照(连续光照、12 h光照/12 h黑暗、连续黑暗)温度(10/15 ℃ 、15/20 ℃、20/25 ℃ 、25/30 ℃、30/35 ℃ 和35/40 ℃)试验、PEG6000渗透胁迫(0、-0.1、-0.2、- 0.4、0.6、-0.8、-1.0、-1.2、-1.4和- 1.6MPa)试验和NaCl胁迫(0、0.05、0.10、0.20、0.30、0.40、0.60和0.80 mol/L)试验,考察室内种子萌发对温度、光照和盐旱胁迫的敏感性,揭示胡杨种子萌发阶段对生境资源的适应策略。结果显示:(1)胡杨种子在温度(10 ℃/15 ℃~35 ℃/40 ℃)与连续光照、连续黑暗和12 h光照/12 h黑暗组合处理条件下均能萌发,且最终种子萌发率均能达到77%以上;3种光照条件下,种子萌发的最适温度范围均为25 ℃/30 ℃~30 ℃/35 ℃,在该温度范围种子萌发表现出快速、集中的特点,且3种光照条件对种子萌发的影响无显著差异。(2)胡杨种子可以在- 1.4~0 MPa渗透势溶液中萌发,而在- 1.0~0 MPa间最终萌发率均达到90%以上,且相互之间无显著差异;但当渗透势低于-0.4 MPa时胡杨种子萌发进程和萌发速率受到显著影响,当溶液渗透势低于- 1.2 MPa时种子萌发受到显著抑制。(3)胡杨种子可以在0~0.80 mol/L NaCl溶液中萌发,而最终萌发率、萌发速率均随着NaCl溶液浓度的增高逐渐降低,但在0~0.20 mol/L范围内无显著差异;当NaCl溶液浓度大于0.20 mol/L时,种子最终萌发率、种子萌发进程和萌发速率均受到显著抑制,萌发高峰期逐渐向后推移。研究结果表明,胡杨种子萌发时温度比较宽泛,对光照无严格要求,适宜温度下萌发快速集中,且萌发时对盐旱胁迫具有一定程度的忍耐性。这些特性有助于胡杨种子充分利用有限的水分条件而快速完成萌发,是胡杨种子萌发对干旱荒漠地区干旱少雨环境的一种生态适应策略。
英文摘要	We studied the effects of light(continuous light, 12 h light/12 h dark,and continuous dark),temperature(10/15 ℃, 15/20 ℃,20/25 ℃,25/30 ℃, 30/35 ℃,and 35/40 ℃),drought(0,-0.1,-0.2,-0.4,0.6,-0.8,-1.0,-1.2,-1.4,and 1.6 MPa)and salt(0,0.05,0.10,0.20,0.30,0.40,0.60,and 0.80 mol/L) stress conditions on the seed germination of Populus euphratica, aims to reveal the seed germination sensibility of P. euphratica towards different temperature, light, salt and drought stresses, and reveal the ecological adaptation mechanisms of P. euphratica seed germination. The results showed that: (1)P. euphratica seeds germinated under variable temperature (10 ℃/15℃ ~30 ℃/35 ℃) and three different light conditions(continuous light, continuous darkness and 12 h light/12 h dark), their final germination percentage were more than 77%. The optimum temperature range among three light conditions were 25 ℃ / 30 ℃ to 30 ℃/35 ℃, and the seeds germinated rapidly and intensively, and three light conditions had no significant effect on seed germination. (2) P. euphratica seeds could germinated under the osmotic stress from 1.4 to 0 MPa,and there was no significant differences among osmotic stress treatments range from 1.0 to 0 MPa,with higher final germination rates,which was more than 90%. However,the seed germination process and germination rate were affected significantly under osmotic stress less than 0.4 MPa, and when osmotic stress less than -1.2 MPa,seed germination was significantly inhibited. (3)P. euphratica seeds could germinated in 0~0.80 mol/L NaCl solution,while the seed germination rates and final germination percentage of P. euphratica saw a decreasing trend along with the increasing salt concentration from 0 to 0.80 mol/L,there was no significant difference in treatments of 0 to 0.20 mol/L. Seeds germination rates, seed germination process and germination ratio were affected significantly when salt solution concentrations were higher than 0.2 mol/L. The results demonstrated that P. euphratica seeds germination characteristics of a broad germination temperature, without strict requirements of light,germinated quickly and intensively under optimum temperatures, and tolerance of salt and drought stresses could help seeds germination quickly under limits of water resource. There was an important ecological adaptation of P. euphratica seed germination to regeneration in arid desert.
中文关键词	胡杨 ; 种子萌发 ; 光照 ; 温度 ; 盐胁迫 ; 干旱胁迫
英文关键词	Populus euphratica seed germination light temperature salt stress drought stress
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:5507295
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/233501
作者单位	1.塔里木大学植物科学学院, 新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室, 阿拉尔, 新疆 843300, 中国; 2.塔里木大学植物科学学院, 阿拉尔, 新疆 843300, 中国
推荐引用方式 GB/T 7714	张肖,王瑞清,李志军. 胡杨种子萌发对温光条件和盐旱胁迫的响应特征[J],2015,35(8):1642-1649.
APA	张肖,王瑞清,&李志军.(2015).胡杨种子萌发对温光条件和盐旱胁迫的响应特征.西北植物学报,35(8),1642-1649.
MLA	张肖,et al."胡杨种子萌发对温光条件和盐旱胁迫的响应特征".西北植物学报 35.8(2015):1642-1649.