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Impact of gamma radiation and salinity on growth and K+/Na+ balance in two populations of Medicago sativa （L.） cultivar Gabès

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Progress in Natural Science:Materials International 2008年第9期18卷 1095-1105页

作者： mokhtar rejili Dalel Telahigue Belgacem Lachiheb Abdessalem Mrabet Ali Ferchichi Arid & Oases Cropping Laboratory Arid Area Institute (IRA) Medenine 4119 Tunisia

The perennial Medicago sativa ***ès is widely grown on saline soils in Tunisian *** and physiological analyses of two populations (Mareth and Gannouch) were conducted in order to study the efiect of salinity and gamma radiation (350 Gy) inter-action on two populations of this *** has been shown that the two irradiated populations of Medicago sativa are fairly tolerant to salt at growth phase compared to the *** to gamma irradiation (350 Gy), alone or in combination with salt stress, increased significantly (p < 0.001) shoot number, stem height and chlorophyll b pigment especially for the Gannouch population, while no change occurred for the Mareth *** presence of salt to 9 g/l afiected significantly the root biomass and induced a reduc-tion of shoot development of both control and irradiated alfalfa *** all treatments, plants of two populations remained able to produce and to allocate dry matter to the difierent *** survey of Na+/K+ ratio showed that the growth of the aerial organs of two non-irradiated populations was at least determined by a selectivity in favour of the K+ ions (r2 = 0.97 and r2 = 0.59 for Mareth and Gannouch non-irradiated populations, respectively).However, the rather weak correlation detected for the irradiated populations, par-ticularly for the irradiated Gannouch, seems to be the consequence of the efiect of irradiation that improved potassium availability, essential element for growth and *** also showed that the two irradiated populations, especially the Mareth, accumu-lated Na+ ions in its photosynthetic *** accumulation was associated with an improvement of foliar water content at a level of salinity around 5 g/*** a mechanism refiects probably an inclusive behaviour of the plants and a good aptitude to use the dominant ions (Na+) for the osmotic ***, the non-irradiated populations are unable to adjust their internal osmot

关键词： Medicago sativa Gamma radiation Salinity Osmotic adjustment K+/Na+ balance Tolerance

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Genetic diversity of rhizobial populations recovered from three Lotus species cultivated in the infra-arid Tunisian soils

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Progress in Natural Science:Materials International 2009年第9期19卷 1079-1087页

作者： mokhtar rejili Maria Josè Lorite Mosbah Mahdhi Juan Sanjuan Pinill Ali Ferchichi Mohamed Mars Arid & Oases Cropping Laboratory Arid Area Institute (IRA) Laboratory of Plant Biotechnology Applied to Crop Improvement Faculty of Sciences of Gabès Soil Microbiology & Symbiotic Systems Department Experimental Station of Zaidìn

Eighty-three bacterial strains isolated from root nodules of Lotus creticus, L. pusillus, and L. arabicus grown in infra-arid Tunisian soils were characterized using a polyphasic approach including phenotypic analysis, rep-PCR and PCR-RFLP analyses of the 16S rRNA gene. Phenotypically, all isolates are fast growers the majority of which grow at a pH of between 5.5 and 9. Most of the tested isolates tolerate NaCl concentrations from 1.39% to 3.48%. By rep-PCR fingerprinting, the genomic similarity varied from 30% to 98%. All tested isolates were clustered into 32 rep-PCR clusters at the similarity level of 80%. The genomic divergence of strains revealed by rep/PCR analysis appeared to be very important since a molecular polymorphism delimiting symbionts for each species of Lotus was identified. With the high-resolution of rep-PCR profiles of the isolates obtained using Pearson’s/UPGMA analysis, the isolates were resolved into 60 different profiling groups to undergo 16S ARDRA analyses. The analysis of all restriction fragments from each strain based on the UPGMA algorithm from the combined patterns showed that Lotus isolates are very diverse and that they were affiliated to Sinorhizobium, Rhizobium, and Mesorhizobium genera.

关键词： Lotus sp. rep-PCR fingerprinting PCR-RFLP 16S rRNA Rhizobia Arid habitat

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