Is salt stress tolerance in Casuarina glauca Sieb. ex Spreng. associated with its nitrogen-fixing root-nodule symbiosis? An analysis at the photosynthetic level

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Is salt stress tolerance in Casuarina glauca Sieb. ex Spreng. associated with its nitrogen-fixing root-nodule symbiosis? An analysis at the photosynthetic level

Batista-Santos, Paula (författare)

Duro, Nuno (författare)

Rodrigues, Ana P. (författare)

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Semedo, Jose N. (författare)

Alves, Paula (författare)

da Costa, Mario (författare)

Graca, Ines (författare)

Pais, Isabel P. (författare)

Scotti-Campos, Paula (författare)

Lidon, Fernando C. (författare)

Leitao, Antonio E. (författare)

Pawlowski, Katharina (författare): Stockholms universitet,Institutionen för ekologi, miljö och botanik

Ribeiro-Barros, Ana I. (författare)

Ramalho, Jose C. (författare)

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(creator_code:org_t)

Elsevier BV, 2015
2015
Engelska.
Ingår i: Plant physiology and biochemistry (Paris). - : Elsevier BV. - 0981-9428 .- 1873-2690. ; 96, s. 97-109

Relaterad länk:: https://urn.kb.se/re...; visa fler...; https://doi.org/10.1...; visa färre...

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Abstract Ämnesord

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Casuarina glauca is an actinorhizal tree which establishes root-nodule symbiosis with N-2-fixing Frankia bacteria. This plant is commonly found in saline zones and is widely used to remediate marginal soils and prevent desertification. The nature of its ability to survive in extreme environments and the extent of Frankia contribution to stress tolerance remain unknown. Thus, we evaluated the ability of C. glauca to cope with salt stress and the influence of the symbiosis on this trait. To this end, we analysed the impact of salt on plant growth, mineral contents, water relations, photosynthetic-related parameters and nonstructural sugars in nodulated vs. non-nodulated plants. Although the effects on photosynthesis and stomatal conductance started to become measurable in the presence of 200 mM NaCl, photochemical (e.g., photosynthetic electron flow) and biochemical (e.g., activity of photosynthetic enzymes) parameters were only strongly impaired when NaCl levels reached 600 mM. These results indicate the maintenance of high tissue hydration under salt stress, probably associated with enhanced osmotic potential. Furthermore, the maintenance of photosynthetic assimilation potential (A(max)), together with the increase in the quantum yield of down-regulated energy dissipation of PSII (Y-NPQ), suggested a down-regulation of photosynthesis instead of photo-damaging effects. A comparison of the impact of increasing NaCl levels on the activities of photosynthetic (RubisCO and ribulose-5 phosphate kinase) and respiratory (pyruvate kinase and NADH-dependent malate dehydrogenase) enzymes vs. photosynthetic electron flow and fluorescence parameters, revealed that biochemical impairments are more limiting than photochemical damage. Altogether, these results indicate that, under controlled conditions, C glauca tolerates high NaCl levels and that this capacity is linked to photosynthetic adjustments.

Ämnesord

NATURVETENSKAP -- Biologi (hsv//swe)
NATURAL SCIENCES -- Biological Sciences (hsv//eng)

Nyckelord

Casuarina glauca
Frankia
Actinorhizal nodules
Salt stress
Photosynthesis

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Av författaren/redakt...: Batista-Santos, ...; Duro, Nuno; Rodrigues, Ana P ...; Semedo, Jose N.; Alves, Paula; da Costa, Mario; visa fler...; Graca, Ines; Pais, Isabel P.; Scotti-Campos, P ...; Lidon, Fernando ...; Leitao, Antonio ...; Pawlowski, Katha ...; Ribeiro-Barros, ...; Ramalho, Jose C.; visa färre...

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Av lärosätet: Stockholms universitet

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