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Proline as a biochemical marker in relation to the ecology of two halophytic Juncus species

Journal of Plant Ecology 2013年第2期6卷 177-186页

作者： Monica Boscaiu cristina lull Josep Llinares Oscar Vicente Herminio Boira Instituto Agroforestal Mediterráneo(IAM UPV)Universitat Politècnica de ValènciaCamino de Vera s/n46022 ValenciaSpain RE-FOREST Departamento de Ingeniería Hidráulica y Medio AmbienteUniversitat Politècnica de ValènciaCamino de Vera s/n46022 ValenciaSpain Instituto de Investigación para la Gestión Integral de Zonas Costeras(IGIC UPV)Universitat Politècnica de ValènciaCalle Paranimf 146730 Grau de GandíaValenciaSpain Instituto de Biología Molecular y Celular de Plantas(IBMCP UPV-CSIC)Universitat Politècnica de ValènciaCamino de Vera s/n46022 ValenciaSpain

Aims osmolytes,used for maintaining osmotic balance and as‘osmoprotectants’,are synthesized in plants as a general,con-served response to abiotic stress,although their contribution to stress-tolerance mechanisms remains ***,the most common osmolyte,accumulates in many plant species in parallel with increased external salinity and is considered a reliable bio-chemical marker of salt *** have measured proline levels in two halophytic,closely related Juncus species under laboratory and field conditions to assess the possible relevance of proline biosynthesis for salt tolerance and therefore for the ecology of these two *** Proline was quantified in plants treated with increasing NaCl con-centrations and in plants sampled in two salt marshes located in the provinces of Valencia and alicante,respectively,in southeast *** conductivity,pH,Na+and Cl−concentrations were measured in soil samples collected in parallel with the plant *** Findings Treatment with NaCl inhibited growth of *** plants in a concentration-dependent manner,but only under high salt conditions for *** treatments led to proline accumulation in both species,especially in the more salt-tolerant *** results,obtained under laboratory conditions,were confirmed in plants sam-pled in the *** all the samplings,proline contents were signifi-cantly lower in *** than in the more tolerant *** growing in the same *** direct correlation between soil salinity and proline levels could be established,but seasonal variations were detected,with increased proline contents under accentuated water deficit *** results suggest that proline biosynthesis is not only an induced,general response to salt stress but also an important contributing factor in the physiological mechanisms of salt tolerance in Juncus,and that it therefore correlates with the ecology of both species.

关键词： halophytes Juncus acutus Juncus maritimus osmolytes salt stress

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