In order to improve the production of olive (Olea europaea L.), plantlets of Variety Ferkani were... more In order to improve the production of olive (Olea europaea L.), plantlets of Variety Ferkani were inoculated with three arbuscular mycorrhizal fungal (AMF) spores (Glomus sp.1, Glomus sp.2, Septoglomus constrictum) isolated from a hot-arid zone in Algeria and three commercial AMF (Rhizophagus intraradices, Funneliformis mosseae, Gigaspora margarita). Mycorrhization parameters and nine growth traits were estimated in two-year-old plantlets, then the variation of growth traits following mycorrhizae parameters of various AMF inoculums was tested. The tested AMF species were all infective and effective for the mycorrhization of Ferkani variety. Glomus sp.1 gave the best results for mycorrhizal colonization and growth parameters. Indeed, the highest colonization frequency (F%) was recorded in plantlets inoculated with Glomus sp.1 (58±6.5%), whereas the highest values of colonization intensity of in the root system (M%) were obtained with Rhizophagus intraradices (2.45±1.46%) and Glomus sp.1 (2.26±0.76%). Abundances of arbuscules were low for all AMF inoculums. The controlled inoculation improved the growth of all plantlets compared to the AMF-free plantlets. AMF-inoculated plantlets showed significantly higher growth in terms shoot height, fresh and dry weights of shoot and root, and number of leaves and nodes. Statistical models revealed that all the latter growth parameters including mycorrhizal responsiveness increased significantly when mycorrhizal parameters increased, and that F% most strongly correlated with plant growth compared to other mycorrhizal parameters. Findings of this controlled inoculation research underline the importance of local AMF isolated from the rhizosphere of Ferkani variety in rapidly and extensively infecting the root system and then increasing growth of the host.
Earthworms are important soil macroinvertebrates and are often used in assessing of soil pollutio... more Earthworms are important soil macroinvertebrates and are often used in assessing of soil pollution. The present study was conducted in order to investigate the effect of two compounds, triple superphosphate TSP (fertilizer), sekator (herbicide) and their mixture at two agricultural doses on a Lumbricus terrestris population. Neurotoxicity (Acetylcholinesterase, AChE), metabolisation (glutathione-S-transferase GST), glutathione (GSH), and protein content were evaluated as biomarkers. Treated earthworms with sekator showed a non-significant increase of protein content (P>0.05). In contrast, protein content increased significantly (P<0.0001) up to (104.75±4.75 and 109.09±5.4 μg/worm) after 72h of exposure with TSP and the mixture respectively. As compared to TSP exposure, sekator in mixture substantially decreased AChE activity. In control series, the GST activities and GSH concentrations remain stable after 72h while sekator and TSP induced the biomarker responses, which was proportional to exposure time and administered dose. Non significant correlations were recorded between AChE and GSH, GST and the protein contents in most interactions. The obtained results indicate that application of sekator in mixture with triple superphosphate could have harmful effects on earthworms since caused significant changes in measured biomarkers.
Daily climatic data of 2006: Daily mean temperatures, precipitation, mean humidity, mean wind spe... more Daily climatic data of 2006: Daily mean temperatures, precipitation, mean humidity, mean wind speed, and indicator for occurrence of rain in the Sabkha of Djendli (Batna, northeast Algeria) during 2006.
Raw input data at station scale: Model of raw data used for the analysis of shared species estima... more Raw input data at station scale: Model of raw data used for the analysis of shared species estimators and indices using EstimateS 9.1.0 based insect species abundances recorded at the eight sampled stations of Sabkha Djendli.
Raw count-data of insect species: Taxonomic list of insect species with their number of individua... more Raw count-data of insect species: Taxonomic list of insect species with their number of individuals trapped during three seasons (2006) and at eight stations around Sabkha Djendli (northeast Algeria).
The vesicular-arbuscular mycorrhizas (AM) are very significant in the life of most plants includi... more The vesicular-arbuscular mycorrhizas (AM) are very significant in the life of most plants including olive tree (Olea europaea L.), which is of great economic importance. However, due to its wide distribution, especially, in the Mediterranean, it is subject to various environmental stresses, particularly drought and aridity. This study aims to evaluate the percentage of root colonization of olive by arbuscular fungi along a climatic gradient (sub-humid, semi-arid and arid), and to estimate how this varies depending years (2010-2012) and seasons (fall, winter, spring and summer). Results showed that the roots of the olive tree are colonized by arbuscular endomycorrhizal fungi under the three types of climate, whatever the season or the study years. Mycorrhization parameters revealed a frequency of colonization (F%) of up to 83%, mycorrhizal intensity (M%) reaching 42% and a rate of arbusculars in the mycorrhizal parts of root fragments (a%) of 4%. Mycorrhizal colonization varies between bioclimatic zones. It is more frequent and intense in the sub-humid climate. Mycorrhiza also varies according to the season; it is more important in spring and slight in winter. This study allowed the characterization, for the first time, of the mycorrhizal status of olive in the northeastern Algeria, and estimate variations of that colonization depending on seasons and climate types.
In order to improve the production of olive (Olea europaea L.), plantlets of Variety Ferkani were... more In order to improve the production of olive (Olea europaea L.), plantlets of Variety Ferkani were inoculated with three arbuscular mycorrhizal fungal (AMF) spores (Glomus sp.1, Glomus sp.2, Septoglomus constrictum) isolated from a hot-arid zone in Algeria and three commercial AMF (Rhizophagus intraradices, Funneliformis mosseae, Gigaspora margarita). Mycorrhization parameters and nine growth traits were estimated in two-year-old plantlets, then the variation of growth traits following mycorrhizae parameters of various AMF inoculums was tested. The tested AMF species were all infective and effective for the mycorrhization of Ferkani variety. Glomus sp.1 gave the best results for mycorrhizal colonization and growth parameters. Indeed, the highest colonization frequency (F%) was recorded in plantlets inoculated with Glomus sp.1 (58±6.5%), whereas the highest values of colonization intensity of in the root system (M%) were obtained with Rhizophagus intraradices (2.45±1.46%) and Glomus sp.1 (2.26±0.76%). Abundances of arbuscules were low for all AMF inoculums. The controlled inoculation improved the growth of all plantlets compared to the AMF-free plantlets. AMF-inoculated plantlets showed significantly higher growth in terms shoot height, fresh and dry weights of shoot and root, and number of leaves and nodes. Statistical models revealed that all the latter growth parameters including mycorrhizal responsiveness increased significantly when mycorrhizal parameters increased, and that F% most strongly correlated with plant growth compared to other mycorrhizal parameters. Findings of this controlled inoculation research underline the importance of local AMF isolated from the rhizosphere of Ferkani variety in rapidly and extensively infecting the root system and then increasing growth of the host.
Earthworms are important soil macroinvertebrates and are often used in assessing of soil pollutio... more Earthworms are important soil macroinvertebrates and are often used in assessing of soil pollution. The present study was conducted in order to investigate the effect of two compounds, triple superphosphate TSP (fertilizer), sekator (herbicide) and their mixture at two agricultural doses on a Lumbricus terrestris population. Neurotoxicity (Acetylcholinesterase, AChE), metabolisation (glutathione-S-transferase GST), glutathione (GSH), and protein content were evaluated as biomarkers. Treated earthworms with sekator showed a non-significant increase of protein content (P>0.05). In contrast, protein content increased significantly (P<0.0001) up to (104.75±4.75 and 109.09±5.4 μg/worm) after 72h of exposure with TSP and the mixture respectively. As compared to TSP exposure, sekator in mixture substantially decreased AChE activity. In control series, the GST activities and GSH concentrations remain stable after 72h while sekator and TSP induced the biomarker responses, which was proportional to exposure time and administered dose. Non significant correlations were recorded between AChE and GSH, GST and the protein contents in most interactions. The obtained results indicate that application of sekator in mixture with triple superphosphate could have harmful effects on earthworms since caused significant changes in measured biomarkers.
Daily climatic data of 2006: Daily mean temperatures, precipitation, mean humidity, mean wind spe... more Daily climatic data of 2006: Daily mean temperatures, precipitation, mean humidity, mean wind speed, and indicator for occurrence of rain in the Sabkha of Djendli (Batna, northeast Algeria) during 2006.
Raw input data at station scale: Model of raw data used for the analysis of shared species estima... more Raw input data at station scale: Model of raw data used for the analysis of shared species estimators and indices using EstimateS 9.1.0 based insect species abundances recorded at the eight sampled stations of Sabkha Djendli.
Raw count-data of insect species: Taxonomic list of insect species with their number of individua... more Raw count-data of insect species: Taxonomic list of insect species with their number of individuals trapped during three seasons (2006) and at eight stations around Sabkha Djendli (northeast Algeria).
The vesicular-arbuscular mycorrhizas (AM) are very significant in the life of most plants includi... more The vesicular-arbuscular mycorrhizas (AM) are very significant in the life of most plants including olive tree (Olea europaea L.), which is of great economic importance. However, due to its wide distribution, especially, in the Mediterranean, it is subject to various environmental stresses, particularly drought and aridity. This study aims to evaluate the percentage of root colonization of olive by arbuscular fungi along a climatic gradient (sub-humid, semi-arid and arid), and to estimate how this varies depending years (2010-2012) and seasons (fall, winter, spring and summer). Results showed that the roots of the olive tree are colonized by arbuscular endomycorrhizal fungi under the three types of climate, whatever the season or the study years. Mycorrhization parameters revealed a frequency of colonization (F%) of up to 83%, mycorrhizal intensity (M%) reaching 42% and a rate of arbusculars in the mycorrhizal parts of root fragments (a%) of 4%. Mycorrhizal colonization varies between bioclimatic zones. It is more frequent and intense in the sub-humid climate. Mycorrhiza also varies according to the season; it is more important in spring and slight in winter. This study allowed the characterization, for the first time, of the mycorrhizal status of olive in the northeastern Algeria, and estimate variations of that colonization depending on seasons and climate types.
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