Ethylene is critical to the maintenance of primary root growth and Fe homeostasis under Fe stress in Arabidopsis.
Ethylene is critical to the maintenance of primary root growth and Fe homeostasis under Fe stress in Arabidopsis.
复制标题
乙烯对于拟南芥铁胁迫下维持初生根生长和铁稳态至关重要
DOI：
10.1093/jxb/erv005
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发表时间：
2015-04
影响因子：
6.9
通讯作者：
Shi W
中科院分区：
文献类型：
--
作者：
Li G;Xu W;Kronzucker HJ;Shi W
We propose that ethylene is involved in the regulation of excess Fe tolerance by maintenance of tissue Fe and K homeostasis in Arabidopsis. Iron (Fe) is an essential microelement but is highly toxic when in excess. The response of plant roots to Fe toxicity and the nature of the regulatory pathways engaged are poorly understood. Here, we examined the response to excess Fe exposure in Arabidopsis wild type and ethylene mutants with a focus on primary root growth and the role of ethylene. We showed that excess Fe arrested primary root growth by decreasing both cell elongation and division, and principally resulteds from direct external Fe contact at the root tip. Pronounced ethylene, but not abscisic acid, evolution was associated with excess Fe exposure. Ethylene antagonists intensified root growth inhibition in the wild type, while the inhibition was significantly reduced in ethylene-overproduction mutants. We showed that ethylene plays a positive role in tissue Fe homeostasis, even in the absence of iron-plaque formation. Ethylene reduced Fe concentrations in the stele, xylem, and shoot. Furthermore, ethylene increased the expression of genes encoding Fe-sequestering ferritins. Additionally, ethylene significantly enhanced root K+ status and upregulated K+-transporter (HAK5) expression. Our findings highlight the important role of ethylene in tissue Fe and K homeostasis and primary root growth under Fe stress in Arabidopsis.
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影响因子：
7.2
作者：
Colón-Carmona, A;You, R;Doerner, P
通讯作者：
Doerner, P
影响因子：
6.9
作者：
Koyama, H;Toda, T;Hara, T
通讯作者：
Hara, T
影响因子：
2.1
作者：
Audebert, A;Sahrawat, KL
通讯作者：
Sahrawat, KL
影响因子：
4.2
作者：
Kinraide, TB
通讯作者：
Kinraide, TB
DOI：
10.2136/sssaj1980.03615995004400030041x
发表时间：
1980-01-01
影响因子：
2.9
作者：
CHEN, CC;DIXON, JB;TURNER, FT
通讯作者：
TURNER, FT