NWIPB OpenIR
Cadmium interferes with maintenance of auxin homeostasis in Arabidopsis seedlings
Hu, Yan Feng1; Zhou, Guoying2; Na, Xiao Fan1; Yang, Lijing1; Nan, Wen Bin1; Liu, Xu1; Zhang, Yong Qiang1; Li, Jiao Long1; Bi, Yu Rong1; Bi, YR (reprint author), Lanzhou Univ, Sch Life Sci, Minist Educ, Key Lab Cell Act & Stress Adaptat, Lanzhou 730000, Gansu, Peoples R China.
2013-07-15
发表期刊JOURNAL OF PLANT PHYSIOLOGY
ISSN0176-1617
卷号170期号:11页码:965-975
文章类型Article
摘要Auxin and its homeostasis play key roles in many aspects of plant growth and development. Cadmium (Cd) is a phytotoxic heavy metal and its inhibitory effects on plant growth and development have been extensively studied. However, the underlying molecular mechanism of the effects of Cd stress on auxin homeostasis is still unclear. In the present study, we found that the root elongation, shoot weight, hypocotyl length and chlorophyll content in wild-type (WT) Arabidopsis seedlings were significantly reduced after exposure to Cd stress. However, the lateral root (LR) formation was markedly promoted by Cd stress. The level and distribution of auxin were both greatly altered in primary root tips and cotyledons of Cd-treated plants. The results also showed that after Cd treatment, the IAA content was significantly decreased, which was accompanied by increases in the activity of the IAA oxidase and alteration in the expression of several putative auxin biosynthetic and catabolic genes. Application of the auxin transport inhibitor, 1-naphthylphthalamic acid (NPA) and 1-naphthoxyacetic acid (1-NOA), reversed the effects of Cd on LR formation. Additionally, there was less promotion of LR formation by Cd treatment in aux1-7 and pin2 mutants than that in the WT. Meanwhile, Cd stress also altered the expression of PINs and AUX1 in Arabidopsis roots, implying that the auxin transport pathway is required for Cd-modulated LR development. Taken together, these findings suggest that Cd stress disturbs auxin homeostasis through affecting auxin level, distribution, metabolism, and transport in Arabidopsis seedling. (C) 2013 Elsevier GmbH. All rights reserved.; Auxin and its homeostasis play key roles in many aspects of plant growth and development. Cadmium (Cd) is a phytotoxic heavy metal and its inhibitory effects on plant growth and development have been extensively studied. However, the underlying molecular mechanism of the effects of Cd stress on auxin homeostasis is still unclear. In the present study, we found that the root elongation, shoot weight, hypocotyl length and chlorophyll content in wild-type (WT) Arabidopsis seedlings were significantly reduced after exposure to Cd stress. However, the lateral root (LR) formation was markedly promoted by Cd stress. The level and distribution of auxin were both greatly altered in primary root tips and cotyledons of Cd-treated plants. The results also showed that after Cd treatment, the IAA content was significantly decreased, which was accompanied by increases in the activity of the IAA oxidase and alteration in the expression of several putative auxin biosynthetic and catabolic genes. Application of the auxin transport inhibitor, 1-naphthylphthalamic acid (NPA) and 1-naphthoxyacetic acid (1-NOA), reversed the effects of Cd on LR formation. Additionally, there was less promotion of LR formation by Cd treatment in aux1-7 and pin2 mutants than that in the WT. Meanwhile, Cd stress also altered the expression of PINs and AUX1 in Arabidopsis roots, implying that the auxin transport pathway is required for Cd-modulated LR development. Taken together, these findings suggest that Cd stress disturbs auxin homeostasis through affecting auxin level, distribution, metabolism, and transport in Arabidopsis seedling. (C) 2013 Elsevier GmbH. All rights reserved.
关键词Arabidopsis Auxin Homeostasis Cadmium Heavy Metal Lateral Root
WOS标题词Science & Technology ; Life Sciences & Biomedicine
关键词[WOS]BOX PROTEIN TIR1 ; MORPHOGENIC RESPONSES ; WATER-STRESS ; NITRIC-OXIDE ; PEA-PLANTS ; THALIANA ; COPPER ; BIOSYNTHESIS ; ACCUMULATION ; EXPRESSION
收录类别SCI
语种英语
WOS研究方向Plant Sciences
WOS类目Plant Sciences
WOS记录号WOS:000322557100001
引用统计
被引频次:130[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/3934
专题中国科学院西北高原生物研究所
通讯作者Bi, YR (reprint author), Lanzhou Univ, Sch Life Sci, Minist Educ, Key Lab Cell Act & Stress Adaptat, Lanzhou 730000, Gansu, Peoples R China.
作者单位1.Lanzhou Univ, Sch Life Sci, Minist Educ, Key Lab Cell Act & Stress Adaptat, Lanzhou 730000, Gansu, Peoples R China
2.Chinese Acad Sci, Northwest Inst Plateau Biol, Xining 810008, Peoples R China
推荐引用方式
GB/T 7714
Hu, Yan Feng,Zhou, Guoying,Na, Xiao Fan,et al. Cadmium interferes with maintenance of auxin homeostasis in Arabidopsis seedlings[J]. JOURNAL OF PLANT PHYSIOLOGY,2013,170(11):965-975.
APA Hu, Yan Feng.,Zhou, Guoying.,Na, Xiao Fan.,Yang, Lijing.,Nan, Wen Bin.,...&Bi, YR .(2013).Cadmium interferes with maintenance of auxin homeostasis in Arabidopsis seedlings.JOURNAL OF PLANT PHYSIOLOGY,170(11),965-975.
MLA Hu, Yan Feng,et al."Cadmium interferes with maintenance of auxin homeostasis in Arabidopsis seedlings".JOURNAL OF PLANT PHYSIOLOGY 170.11(2013):965-975.
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