Gibberellin Is Involved in Inhibition of Cucumber Growth and Nitrogen Uptake at Suboptimal Root-Zone Temperatures

doi:10.1371/journal.pone.0156188

	Gibberellin Is Involved in Inhibition of Cucumber Growth and Nitrogen Uptake at Suboptimal Root-Zone Temperatures
	Bai, Longqiang 1; Deng, Huihui 2; Zhang, Xiaocui 1; Yu, Xianchang 1; Li, Yansu 1
刊名	PLOS ONE
	2016
卷号	11 期号:5 页码:-
ISSN号	1932-6203
DOI	10.1371/journal.pone.0156188
通讯作者	Bai, Longqiang
英文摘要	Suboptimal temperature stress often causes heavy yield losses of vegetables by suppressing plant growth during winter and early spring. Gibberellin acid (GA) has been reported to be involved in plant growth and acquisition of mineral nutrients. However, no studies have evaluated the role of GA in the regulation of growth and nutrient acquisition by vegetables under conditions of suboptimal temperatures in greenhouse. Here, we investigated the roles of GA in the regulation of growth and nitrate acquisition of cucumber (Cucumis sativus L.) plants under conditions of short-term suboptimal root-zone temperatures (T-r). Exposure of cucumber seedlings to a T-r of 16 degrees C led to a significant reduction in root growth, and this inhibitory effect was reversed by exogenous application of GA. Expression patterns of several genes encoding key enzymes in GA metabolism were altered by suboptimal T-r treatment, and endogenous GA concentrations in cucumber roots were significantly reduced by exposure of cucumber plants to 16 degrees C T-r, suggesting that inhibition of root growth by suboptimal T-r may result from disruption of endogenous GA homeostasis. To further explore the mechanism underlying the GA-dependent cucumber growth under suboptimal T-r, we studied the effect of suboptimal T-r and GA on nitrate uptake, and found that exposure of cucumber seedlings to 16 degrees C T-r led to a significant reduction in nitrate uptake rate, and exogenous application GA can alleviate the down-regulation by up regulating the expression of genes associated with nitrate uptake. Finally, we demonstrated that N accumulation in cucumber seedlings under suboptimal T-r conditions was improved by exogenous application of GA due probably to both enhanced root growth and nitrate absorption activity. These results indicate that a reduction in endogenous GA concentrations in roots due to down-regulation of GA biosynthesis at transcriptional level may be a key event to underpin the suboptimal T-r-induced inhibition of root growth and nitrate uptake. These findings may have important practical implications in effective mitigation of suboptimal temperature-induced vegetable loss under greenhouse conditions.
学科主题	Multidisciplinary Sciences
语种	英语
出版者	PUBLIC LIBRARY SCIENCE
WOS记录号	WOS:000376880200068
内容类型	期刊论文
源URL	[http://111.203.20.206/handle/2HMLN22E/100820]
专题	蔬菜花卉研究所_栽培与采后技术研究室
作者单位	1.Chinese Acad Agr Sci, Inst Vegetables & Flowers, Beijing 100081, Peoples R China 2.Shandong Agr Univ, Coll Hort Sci & Engn, Tai An 271018, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Bai, Longqiang,Deng, Huihui,Zhang, Xiaocui,et al. Gibberellin Is Involved in Inhibition of Cucumber Growth and Nitrogen Uptake at Suboptimal Root-Zone Temperatures[J]. PLOS ONE,2016,11(5):-.
APA	Bai, Longqiang,Deng, Huihui,Zhang, Xiaocui,Yu, Xianchang,&Li, Yansu.(2016).Gibberellin Is Involved in Inhibition of Cucumber Growth and Nitrogen Uptake at Suboptimal Root-Zone Temperatures.PLOS ONE,11(5),-.
MLA	Bai, Longqiang,et al."Gibberellin Is Involved in Inhibition of Cucumber Growth and Nitrogen Uptake at Suboptimal Root-Zone Temperatures".PLOS ONE 11.5(2016):-.