期刊
PLANT SIGNALING & BEHAVIOR
卷 10, 期 3, 页码 -出版社
TAYLOR & FRANCIS INC
DOI: 10.4161/15592324.2014.991596
关键词
ammonium; Arabidopsis thaliana; chlorophyll; natural variation; nitrogen nutrition; SPAD
资金
- Basque Government [IT526-10]
- People Program (Marie Curie Actions) of the European UnionsSeventh Framework Program (FP7) under REA [334019]
Nitrate (NO3-) and ammonium (NH4+) are the main forms of nitrogen available in the soil for plants. Excessive NH4+ accumulation in tissues is toxic for plants and exclusive NH4+-based nutrition enhances this effect. Ammonium toxicity syndrome commonly includes growth impairment, ion imbalance and chlorosis among others. In this work, we observed high intraspecific variability in chlorophyll content in 47 Arabidopsis thaliana natural accessions grown under 1 mM NH4+ or 1 mM NO3- as N-source. Interestingly, chlorophyll content increased in every accession upon ammonium nutrition. Moreover, this increase was independent of ammonium tolerance capacity. Thus, chlorosis seems to be an exclusive effect of severe ammonium toxicity while mild ammonium stress induces chlorophyll accumulation.
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