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Z. Krimi 《EPPO Bulletin》2001,31(1):114-114
Agrobacterium tumefaciens has been isolated from 2-year-old seedlings of Eucalyptus occidentalis growing in forest soil in Algeria. 相似文献
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Guillaume PierreFrédéric Sannier Romain GoudeArmelle Nouviaire Zoulikha Maache-RezzougSid-Ahmed Rezzoug Thierry Maugard 《Journal of Cereal Science》2011,54(3):305-310
Microcrystalline cellulose (Avicel PH102) and Brewers’ spent grain (BSG) were subjected to Détente Instantanée Contrôlée (DIC) thermomechanical pre-treatment before exposure to cellulases (Celluclast 1.5 L). In a first part, we showed that the addition of β-glucosidase (Novozym-188) increased the hydrolysis yield of Avicel. A maximal theoretical yield (100%), was obtained for 5 and 10 g/L of Avicel using a mixture of Celluclast 1.5 L/Novozym-188. After DIC pre-treatments, the initial rate and final yield of hydrolysis decreased in comparison with those from untreated microcrystalline cellulose. This phenomenon may be due to the modification of the crystallinity of pure cellulose and the formation of inhibitors during the pre-treatment. In a second part, BSG was thermomechanically pre-treated and hydrolyzed. The results showed that the hydrolysis yield of BSG treated at pressure levels between 2 and 7 bar during 15 min was strongly improved compared to hydrolysis yield of untreated BSG. The optimized hydrolysis process, under intensive DIC conditions, achieved a glucose yield corresponding to 100% of the theoretical cellulose value. The morphology of BSG samples was studied with Scanning Electronic Microscopy (SEM) and highlighted that the structure of pre-treated BSG showed an important disruption compared to the rigid structure of untreated BSG. 相似文献
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Zoulikha Krimi Aïda Raio Annik Petit Xavier Nesme Yves Dessaux 《European journal of plant pathology / European Foundation for Plant Pathology》2006,116(3):237-246
In the Sidi M’djahed nursery (Algeria), over 60,000 eucalyptus (Eucalyptus occidentalis) plantlets exhibited tumour-like growths localized at the crown of the plants that resembled crown galls caused by Agrobacterium tumefaciens. Bacteria colonizing the galls were isolated and purified. Most (22 out of 24) of the isolates had cultural and biochemical characteristics similar to those of strains of the biovar 1 of A. tumefaciens. Twenty out of 22 Agrobacterium isolates induced tumour formation on various test plants. In PCR experiments, DNA extracted from these virulent strains yielded an amplification signal corresponding to a 247-bp fragment located within the virulence region of nopaline type Ti plasmid. Consistent with this, the opine nopaline was detected in the tumours induced on test plants – but not on eucalyptus plants. Nopaline was degraded by the 20 pathogenic isolates that were also sensitive to agrocin 84, indicating the presence of a nopaline-type pTi in these strains. The chromosomal region encoding the 16S rRNA was analyzed in a sub-population of the pathogenic agrobacterial isolates. The analyzed strains were found to belong to the ribogroup of the reference strain B6. Interestingly, Eucalyptus camaldulensis and Eucalyptus cladocalyx grown in the same nursery and in the same soil substrate developed no galls. 相似文献
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Fomes fomentarius, Coriolus versicolor and Inonotus hispidus were the commonest wood-decay fungi on declining trees in the Tlemcen area of Algeria, associated principally with Populus spp., Quercus suber and Fraxinus spp. respectively. 相似文献
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Alice Meullemiestre Emmanuel Petitcolas Zoulikha Maache-Rezzoug Christian Ginies Farid Chemat 《Wood material science & engineering》2014,9(2):76-83
This study concerns the transformation of maritime pine (Pinus pinaster) sawdust waste into potentially novel products through isolation of volatile compounds in the form of valuable oil. Different techniques, namely, turbohydrodistillation (THD), solvent-free microwave extraction (SFME), microwave hydrodiffusion and gravity (MHG), and ultrasound-assisted extraction (UAE) were tested. These different processes were compared to conventional hydrodistillation (HD) and allowed to extract almost similar yields of isolated oils. THD which consists in a permanent agitation during extraction and UAE improve the kinetics of extraction, but MHG and SFME required the shortest extraction times, 60 min to reach a maximal yield of 0.272 and 0.266% (w/w), respectively. The compositions of isolated oils are almost similar with a high proportion of oxygenated compounds for MHG and SFME, respectively, 56.9% and 54.5% compared with 37.7%, 44.1% and 34.1%, respectively, for THD, UAE, and for the conventional HD method. 相似文献
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Saadia Laabas Zineb Faiza Boukhatem Zoulikha Bouchiba Sarra Benkritly Nour ElHouda Abed Halima Yahiaoui 《Journal of plant nutrition》2017,40(11):1616-1626
Strains isolated from chickpea (Cicer arietinum L.) rhizospheric soil from selected sites in Algeria were screened for their plant-growth-promoting potential, for indole acetic acid production and P solubilization ability. Then, we selected native rhizobial strains with high nitrogen-fixing potential. On the basis of their efficiency under controlled conditions, two plant-growth-promoting rhizobacteria (PGPR) isolates and three nodulating bacteria were selected. Then, the effect of single PGPR isolates inoculation was compared to their combination with rhizobial inoculants on plant growth, on native cereal-growing soils under greenhouse conditions. No effects were observed on chickpea yield by using rhizobial inoculation alone, nor by PGPR-rhizobial co-inoculation on two soils presenting weak and no nodulation pattern in natural conditions. Only PGPR inoculation improved growth of plants on soil with no nodulation pattern. These findings emphasized inoculation on native soils at a little scale before large assays on field because no one could predict inocula behavior with native soil microflora. 相似文献
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A. Benjama A. Boubaker H. Khlief Z. Krimi X. Nesme M. López A. Zoina 《EPPO Bulletin》2002,32(3):463-466
Crown gall was found in all fruit-growing areas in Algeria, Jordan, Morocco and Tunisia. In the last three countries, shoot and/or root inoculation of stone fruits, rose and/or grapevine (according to country) with Agrobacterium radiobacter var. tumefaciens showed that all species were susceptible independently of country and origin of bacterial strains, with the exception of the Beldi land race of apricot in Morocco, which was tolerant. The level of susceptibility varied according to the strains used. 相似文献
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