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Yi-hua Zhan,Cheng-hao Zhang,Qiu-xun Zheng,Zong-an Huang,Chen-liang Yu 한국식물학회 2017 Journal of Plant Biology Vol.60 No.6
Phytotoxic effects of cadmium (Cd), a heavy metalpollutant, on plants have been extensively examined. Auxinplays vital roles in many aspects of plant development. Theassociation between root growth and auxin signaling in CdstressedSorghum bicolor was analyzed in our study. Rootelongation, shoot length and the maximal photochemicalefficiency (Fv/Fm) in S. bicolor seedlings were dramaticallyreduced after Cd stress treatment. Cd was found to bepredominantly confined in the meristematic zone using a Cdstainingmethod. Cd stress remarkably influenced the cellcycle progression at the root tip as shown by EdU (ethynyldeoxyuridine) assay. The content of IAA was markedlydiminished in the roots of Cd-stressed S. bicolor, which wasalong with the increase of IAA oxidase activity. Auxintransport inhibitors, 1-naphthoxyacetic acid (1-NOA) or 1-naphthylphthalamic acid (NPA), greatly reduced plant toleranceto Cd stress, whereas exogenous application of 1-naphthaleneacetic acid (NAA) improved Cd tolerance in S. bicolor seedlings. Cd stress altered the transcript level ofsome putative auxin biosynthetic genes. In addition, NAAinterfered with the homeostasis of Cd-induced reactiveoxygen species (ROS). These results revealed that Cd stressdisturbed the growth of S. bicolor seedlings by affecting thehomeostasis of auxin and ROS.