干旱区生态环境知识资源中心(Arid): 赤霉素对盐胁迫下红砂种子萌发的影响

Arid

	赤霉素对盐胁迫下红砂种子萌发的影响
其他题名	Effects of gibberellin on the germination of Reaumuria soongorica seeds under salt stress
	牛宋芳; 王利娟; 刘秉儒
来源期刊	草业学报
ISSN	1004-5759
出版年	2017
卷号	26 期号:6 页码:89-97
中文摘要	超旱生小灌木红砂是干旱半干旱区优势乡土物种,但是种子依靠萌发繁殖活力较低,研究赤霉素与不同浓度盐交互作用对红砂种子萌发的影响,对于植被恢复和改善我国西部的生态环境具有重要作用。本试验采用培养皿纸上发芽法,对红砂种子进行不同赤霉素浓度(100、200、400、600 mg/L)、盐浓度(50、100、150、200、250、300 mmol/L)以及赤霉素与盐交互作用3种处理,以蒸馏水处理为对照,研究赤霉素对盐胁迫后红砂种子萌发和幼苗生长情况的影响。结果表明:盐胁迫抑制种子的萌发,红砂种子的发芽率随盐浓度升高逐渐下降,发芽整齐度随浓度升高而逐渐增大,胚根长与盐浓度具有显著负相关关系(R~2=0.9452);使用较高浓度的赤霉素处理红砂种子,发芽率、发芽指数与发芽速度均随浓度增大而先减小后增大的趋势,阈值为200 mg/L,不同浓度赤霉素处理后的红砂种子的胚根长及胚芽长之间无显著性差异;赤霉素对较高浓度(>100 mmol/L)盐胁迫后红砂种子的发芽率有显著的改善作用,可以提高种子的发芽速度、发芽指数。赤霉素能促进盐胁迫后红砂的种子萌发,促进胚的发育。
英文摘要	Reaumuria soongorica,an extreme xeric shrub and a dominant species in desert and semi-desert areas, has low levels of reproductive through germination.This shrub could be an important species for vegetation restoration and the improvement of eco-environments in western China.A study has been undertaken to investigate the effect of interactions between gibberellin(GA)and different salinity conditions on seed germination in R.soongorica.Using petri dish techniques,the treatments studied were germination under H_2O(control), various concentrations of NaCl to explore saline stress(100,200,400,600 mg/L;treated group 1),a range of GA concentrations(50,100,150,200,250,300 mmol/L,treated group 2)and their combined interaction (treated group 3).The results showed that seed germination percentages continuously decreased with increasing salinity,while germination uniformity increased with rising salt levels.With increasing NaCl concentrations,the length of the R.soongoricas radicle and germ gradually decreased,and radicle length significantly decreased(R~2=0.9452).With increasing concentrations of GA,germination percentage,the germination index and germination speed all at first decreased and then increased,with a threshold reached at 200 mg/L. With NaCl concentrations of more than 50 mmol/L,germination energy gradually decreased with increasing GA applications.There were no significant differences between the length of R.soongoricas radicle and germ under different concentrations of GA.This research shows that while salt stress inhibits seed germination,GA enhances the germination percentage and index under highly salt-stressed conditions(more than 100 mmol/L). GA applications could thus be used to promote the establishment and growth of R.soongoricain desert and semi-desert regions.
中文关键词	红砂 ; 赤霉素 ; 盐胁迫 ; 发芽率
英文关键词	Reaumuria soongorica gibberellin salt stress germination percentage
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRONOMY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6018497
来源机构	宁夏大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/235699
作者单位	宁夏大学, 西北土地退化与生态恢复国家重点实验室培育基地;;西北退化生态系统恢复与重建教育部重点实验室, 银川, 宁夏 750021, 中国
推荐引用方式 GB/T 7714	牛宋芳,王利娟,刘秉儒. 赤霉素对盐胁迫下红砂种子萌发的影响[J]. 宁夏大学,2017,26(6):89-97.
APA	牛宋芳,王利娟,&刘秉儒.(2017).赤霉素对盐胁迫下红砂种子萌发的影响.草业学报,26(6),89-97.
MLA	牛宋芳,et al."赤霉素对盐胁迫下红砂种子萌发的影响".草业学报 26.6(2017):89-97.