NDLI: The impact of salinity on the symbiosis between Casuarina glauca Sieb. ex Spreng. and N$_{2}$-fixing Frankia bacteria based on the analysis of Nitrogen and Carbon metabolism

Content Provider	Springer Nature Link
Author	Duro, Nu Batista Santos, Paula Costa, Mário Maia, Rodrigo Castro, Isabel V. Ramos, Margarida Ramalho, José C. Pawlowski, Katharina Máguas, Cristina Ribeiro Barros, Ana
Copyright Year	2015
Abstract	Casuarina glauca is an actinorhizal plant that establishes root-nodule symbiosis with N$_{2}$-fixing bacteria of the genus Frankia. This plant is highly recalcitrant to extreme environmental conditions such as salinity and drought. The aim of this study was to evaluate the impact of salt stress on the symbiotic relationship between C. glauca and Frankia Thr, focusing on N and C metabolism.Symbiotic and non-symbiotic plants were exposed to 0, 200, 400 and 600 mM NaCl. The following analyses were performed: stable carbon (δ$^{13}$C) and nitrogen (δ$^{15}$N) isotope signature; nitrogenase activity in nodules (acetylene reduction assay); and gene expression of a set of genes involved in nodule infection and N/C metabolism (qRT-PCR). Data were analysed using two-way ANOVA.Salt stress induced an enrichment in δ$^{13}$C and δ$^{15}$N, reflecting a negative impact of salt in the relative water content and N$_{2}$ fixation, respectively. Furthermore, nitrogenase activity in nodules was insignificant already at 200 mM NaCl, consistent with the expression patterns of nifH as well as of plant genes involved in nodule induction and metabolism.The ability of C. glauca to thrive under highly saline environments is not dependent on the symbiosis with Frankia.
Starting Page	327
Ending Page	337
Page Count	11
File Format	PDF
ISSN	0032079X
Journal	Plant and Soil
Volume Number	398
Issue Number	1-2
e-ISSN	15735036
Language	English
Publisher	Springer International Publishing
Publisher Date	2015-09-15
Publisher Place	Cham
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Casuarina glauca Frankia Actinorhizal nodules Salt stress Plant Sciences Soil Science & Conservation Plant Physiology Ecology
Content Type	Text
Resource Type	Article
Subject	Soil Science Plant Science

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