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Ammonium affects cell viability to inhibit root growth in Arabidopsis

Cheng QIN 1,Ke-ke YI 2,Ping WU 1 (1 State Key Laboratory of Plant Physiology and Biochemistry,College of Life Sciences,Zhejiang University,Hangzhou 310058,China) (2 Zhejiang Academy of Agricultural Sciences,Hangzhou 310021,China)  
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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