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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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Adaptive responses to drought of two Retama raetam subspecies from Tunisia

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Journal of Plant Ecology 2021年第3期14卷 527-540页

作者： Ricardo Gil Dhikra Zayoud Zeineb Ouerghi monica boscaiu Oscar Vicente Mohamed Neffati Instituto de Biologfa Molecular y Celular de Plantas(IBMCP UPV-CSIC)Universitat Politecnica de Valencia46022 ValenciaSpain Laboratoire des Ecosystemes Pastoraux et Valorisation des Plantes Spontanees et des Micro-organismes Associes Institut des Regions AridesUniversite de Gabes4119 MedenineTunisia Departement de Biologie Faculte des Sciences de Tunis1060 TunisTunisia Instituto Agroforestal Mediterraneo(IAM) Universitat Politecnica de Valencia46022 ValenciaSpain Instituto de Conservacion y Mejora de la Agrodivcrsidad Valenciana(COMAV) Universitat Politecnica de Valencia46022 ValenciaSpain

Aims The survival and ecological distribution of plants in arid habitats are mainly conditioned by water availability and physiological adaptations to withstand *** the present study,we have compared the physiological responses to drought of two Retama raetam(retama)subspecies from Tunisia,one of them living under the desert climate(***)and the other one growing on the coast(***).Methods To physiologically characterize the two *** subspecies,and to elucidate their main mechanisms underlying their tolerance to drought stress,parameters related to seed germination,growth,photosynthesis(net photosynthetic rate,intracellular CO_(2) concentration,transpiration rate,stomatal conductance and water-use efficiency)and accumulation of osmolytes(proline,glycine betaine[GB]and soluble sugars)were determined in 4-month-old plants subjected to stress for up to 1 *** Findings Drought significantly inhibited germination,growth and all the evaluated photosynthetic *** of *** *** were severely affected by drought after 3 weeks of treatment when photosynthesis rates were up to 7-fold lower than in the *** the same time,proline and GB significantly accumulated compared with the irrigated controls,but much less than in *** ***;in the latter subspecies,proline and GB increased to levels 24-and 6-fold higher,respectively,than in the corresponding *** summary,the population living in the desert region exhibited stronger tolerance to drought stress than that adapted to the semiarid littoral climate,suggesting that tolerance in *** is dependent on accumulation of osmolytes.

关键词： germination leaf gas exchange osmolytes Retama raetam water stress xerophytes

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