NDLI: The differing responses of two Arabidopsis ecotypes to ammonium are modulated by the photoperiod regime

Content Provider	Springer Nature Link
Author	Li, Baohai Shi, Weiming Su, Yanhua
Copyright Year	2010
Abstract	Responses to excessive ammonium (NH$_{4}$ $^{+}$) were compared between two Arabidopsis ecotypes (Col-0, JA22) with respect to different photoperiods in hydroponics. In this study, we showed that external extra NH$_{4}$ $^{+}$ led to severe growth suppression, accumulations of free NH$_{4}$ $^{+}$ and amino acids and increased the activities of glutamine synthetase (GS) and glutamate dehydrogenase (GDH) in shoots of the two Arabidopsis ecotypes. However, the levels of free NH$_{4}$ $^{+}$ and total amino acids increased, whereas the activities of GS, NADH-dependent glutamate synthase and GDH decreased under the continuous light when compared with the light (16 h)–dark (8 h) cycle photoperiod. Statistical analyses suggested that strong correlations exist among the growth reduction, accumulations of free NH$_{4}$ $^{+}$, total amino acids and levels of GS activity in shoots under the high NH$_{4}$ $^{+}$ stress regardless of the photoperiod regimes. Interestingly, under the continuous light, Col-0 showed more resistant to such growth reduction and maintained about onefold higher capability of converting excess free NH$_{4}$ $^{+}$ into amino acids, with onefold higher GS activity induced by the external NH$_{4}$ $^{+}$ when compared with JA22. In contrast, these differences were abolished between Col-0 and JA22 under the light–dark cycle condition. Taken together, our results conclude that the sensitivity to NH$_{4}$ $^{+}$ of Col-0 and JA22 is changed between the continuous light and the light–dark cycle photoperiod, which is correlative to the alteration of the GS activity in shoots.
Starting Page	325
Ending Page	334
Page Count	10
File Format	PDF
ISSN	01375881
Journal	Acta Physiologiae Plantarum
Volume Number	33
Issue Number	2
e-ISSN	18611664
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-06-23
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Accessions Glutamine synthetase Glutamate dehydrogenase Circadian clocks NH$_{4}$ $^{+}$ toxicity Agriculture Plant Physiology Plant Biochemistry Plant Genetics & Genomics Plant Pathology Plant Anatomy/Development
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science Agronomy and Crop Science

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