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Adaptive responses to drought of two Retama raetam subspecies from Tunisia

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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High Sensitivity of Porous Cu-Doped SnO₂ Thin Films to Methanol

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Advances in Nanoparticles 2016年第2期5卷 140-148页

作者： Sara Benzitouni Mourad Zaabat Aicha Khial Djamil Rechem Ahlem Benaboud dhikra Bouras Abdelhakim Mahdjoub Mahdia Toubane Raphael Coste Laboratoire des Composants Actifs et Matériaux (LCAM) Université Larbi Ben M’hidi Oum El Bouaghi Algérie Laboratoire des Matériaux et Structure des Systèmes Electromécaniques et leur Fiabilité (LMSSEF) Université Larbi Ben M’hidi Oum El Bouaghi Algérie Unité de Recherche Matériaux Procédés et Environnement (URMPE) Université M’hamed Bougara Boumerdes Algérie Laboratoire de Recherche en Nanoscience (LRN) UFR Sciences Université de Reims Reims France

Porous Cu-doped SnO2 thin films were synthesized by the sol-gel dip-coating method for enhancing methanol sensing performance. The effect of Cu doping concentration on the SnO2 sensibility was investigated. XRD data confirm that the fabricated SnO2 films are polycrystalline with tetragonal rutile crystal structure. AFM and SEM micrographs confirmed the roughness and the porosity of SnO2 surface, respectively. UV-Vis spectrum shows that SnO2 thin films exhibit high transmittance in the visible region ~95%. The band gap (3.80 - 3.92 eV) and the optical thickness (893 - 131 nm) of prepared films were calculated from transmittance data. The sensing results demonstrate that SnO2 films have a high sensitivity and a fast response to methanol. In particular, 3% Cu-SnO2 films have a higher sensitivity (98%), faster response (10-2 s) and shorter recovery time (18 s) than other films.

关键词： SnO2 Cu-Doped Sensitivity Porosity Response Time Band Gap Thin Films

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