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| Ammonium affects cell viability to inhibit root growth in Arabidopsis |
| Cheng Qin, Ke-ke Yi, Ping Wu |
| State Key Laboratory of Plant Physiology and Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310058, China, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China |
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Abstract Ammonium (NH4+) is an important form of nitrogen nutrient for most plants, yet is also a stressor for many of them. However, the primary events of NH4+ toxicity at the cellular level are still unclear. Here, we showed that NH4+ toxicity can induce the root cell death in a temporal pattern which primarily occurs in the cells of root maturation and elongation zones, and then spreads to the cells in the meristem and root cap. The results from the NH4+-hypersensitive mutant hsn1 further confirmed our findings. Taken together, NH4+ toxicity inhibits primary root growth by inhibiting cell elongation and division and inducing root cell death.
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Received: 15 September 2010
Published: 07 June 2011
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