Dr. Yahia Nourredine has completed his bachelors degree in the field Biosystematics and Plant Breeding at University of Constantine 1 from 1985-1989. He has Completed his masters degree in the field of Plant breeding and genetics in the University of Oran in the year 1992-1998. He has completed his PhD in the University of Oran in the field of Plant Breeding and Genetics. He is also an researcher in the University of Oran from 1999 to till date. Address: Algeria
Low temperature or cold is one of the most important stress factors that control and limit seed g... more Low temperature or cold is one of the most important stress factors that control and limit seed germination, young seedling development, growth and development of the adult plant as well as plant distribution worldwide. There are several reports of altered gene expression in plants in response to and during cold acclimation and conclude that cold-responsive genes provide the biochemical and physiological changes necessary for growth and development at low temperature. Indeed, when the plants are exposed to cold stress, cold- or chilling-tolerant plants reprogramme their transcriptome in response to cold adaptation. It is an established fact that the ICE-1-CBF transcriptional cascade plays crucial role in cold acclimation in diverse plant species, and through transgenic approaches the genetic manipulation of CBF pathway can improve cold tolerance of resultant transgenics. On the other hand, studies have revealed that, besides transcriptional regulation, plants employ diverse post-transcriptional regulatory mechanisms to modulating their gene expression patterns during cold acclimation.
Low temperature or cold is one of the most important stress factors that control and limit seed g... more Low temperature or cold is one of the most important stress factors that control and limit seed germination, young seedling development, growth and development of the adult plant as well as plant distribution worldwide. There are several reports of altered gene expression in plants in response to and during cold acclimation and conclude that cold-responsive genes provide the biochemical and physiological changes necessary for growth and development at low temperature. Indeed, when the plants are exposed to cold stress, cold- or chilling-tolerant plants reprogramme their transcriptome in response to cold adaptation. It is an established fact that the ICE-1-CBF transcriptional cascade plays crucial role in cold acclimation in diverse plant species, and through transgenic approaches the genetic manipulation of CBF pathway can improve cold tolerance of resultant transgenics. On the other hand, studies have revealed that, besides transcriptional regulation, plants employ diverse post-transcriptional regulatory mechanisms to modulating their gene expression patterns during cold acclimation.
In order to have more information on early seedling development under salinity stress (one of the... more In order to have more information on early seedling development under salinity stress (one of the important factors limiting plant productivity and also crop growth), it will be interesting to examine radicle growth in comparison to plumule elongation under different salinity stress conditions. In this study, we assessed the variability of four genotypes of the plant model Medicago truncatula under four levels of salt stress (distilled water as control 0, 68, 102 and 137 mM) of sodium chloride (NaCl) solution. Several studies are focalised in root or radical development because is the most sensitive part of the plant and controls rapid transmission information to other plant parts. In order to evaluate the degree of radicle sensitivity, we measured the plumule length to radicle length ratio (PL: RL ratio). Also, we investigated the relationship between storage protein content, seed weight and salinity tolerance degree. The results show that Tru 131 and Tru 673 genotypes, with a low ...
Salt stress is a major environmental constraint most limiting plant productivity. Seeking salt-to... more Salt stress is a major environmental constraint most limiting plant productivity. Seeking salt-tolerant crops requires an examination of the behavior of the plant development including seed germination stage. The effects of NaCl stress (100 mM) combined or not with different solutions of phytohormones ABA (0.005 mM), GA3 (0.005 mM) and SA (0.5 mM) on germination of two processing tomato cultivars named Rio Grande (Rg) and Imperial (Ip) were investigated. Seeds were subjected to salt stress, combined or not with hormones, at two stages of development (48 and 96 hours). The results shows that the germination rate and germinate value of the two processing cultivars of tomato were influenced by the different treatments. On the other hand, salicylic acid as GA3 attenuate the effect of NaCl. Instead, the middle enriched with ABA inhibits seed germination. Moreover, the tested stress conditions had shown a significant variability in the germination and handling between the two germination ...
Environmental degradation and the decrease of ecosystem service provision are currently of major ... more Environmental degradation and the decrease of ecosystem service provision are currently of major concern, with current agricultural systems being a major driver. To meet our future environmental and sustainability targets a transformation of the agro-food systems and current agricultural value chain are crucial. One approach to redesign farming systems is the concept of biodiversity-based agriculture (BBA) which relies on sustainable diversification of biological components and their natural interactions in farming systems to maximize fertility, productivity, and resilience to external perturbations. Despite minimizing anthropogenic inputs, BBA is not yet able to meet all beneficial environmental objectives. BBA applied in the Mediterranean basin requires urgent innovation in approaches, methodologies, and models for small-holder traditional farming systems to ensure a stable provision of ecosystem services and better resilience to environmental stresses linked to climate change. Le...
In Algeria, the region of Mostaganem is known for its agricultural soils with a sandy tendency an... more In Algeria, the region of Mostaganem is known for its agricultural soils with a sandy tendency and abnormally loaded with soluble salts affecting the yields of crops. To assess the salt tolerance threshold of the bean culture Phaseolus vulgaris L. (Fabales Fabaceae) variety “coco rose” was grown in plastic pots filled with two types of substrate, sand and sand amended with 7% bentonite (calcium clay of mining origin). The test was carried out in a greenhouse with controlled climatic conditions (variant temperature between 23-25°C, humidity is around 75% and a photoperiod of 12 hours). At the 5-leaf stage, irrigation with saline was provided with four saline concentrations (0, 50, 100 and 200 meq), the control is irrigated with distilled water. Two weeks later, the microscopic observations were made with an Optica type microscope, the results show a variability of the effect of saline stress depending on the organ and the concentration of the saline treatment. The anatomical structur...
Biotic and abiotic stresses impose a major threat to agriculture. Increase crop productivity need... more Biotic and abiotic stresses impose a major threat to agriculture. Increase crop productivity need to develop stress tolerant plants. Tomato ( Lycopersicon esculentum Mill.) is a model plant for studying the mechanisms of plant salt tolerance. Plants may be exposed to different salt levels at various stages of development; seed germination represents a major bottleneck in the species life cycle. In this context, seeds of eight varieties of tomato were tested under different levels of NaCl. Two approaches were adopted in this investigation: (a) Morphometric variability measurement, (b) biochemical changes of protein profile and iso-enzyme esterase activity. For the morphometric variability, two quantitative components were measured, vigor seed and length of seedling, for each parameter tolerance index (IT = treated / control) was evaluated. Statistical analysis was carried by software STATISTICA (version6. France). One-way ANOVA analysis indicates a significant difference between trea...
ABSTRACT A comparative analysis of cold tolerance of the male gametophyte and the sporophyte has ... more ABSTRACT A comparative analysis of cold tolerance of the male gametophyte and the sporophyte has been undertaken on four varieties of tomato. The seed germination rate and the growth rate of the young plants have been assessed at sporophytic stage, atter a stress exposition of variable duration to a constant temperature of 4 °C. The pollen germination rate and the tube growth have been recorded at the gametophytic stage under the same cold stress. The sporophyte data analysis showed that the four varieties differed significantly between themselves with or without stress application for both their seed germination rate and their post-germinative growth. The Saint-Pierre variety appeared as the most tolerant and the variety Marmande as the least tolerant. In contrary, data on pollen grain indicate that the relative degree of tolerance of each variety changed with treatement duration and the trait analysed. These results showed that differences observed between varieties for germination rate and post-germinative growth rate under low temperature are partially reflected at the gametophytic level. Key words : germination - pollen - seeds - tomato - cold temperature - stress -pollen selection.
Low temperature or cold is one of the most important stress factors that control and limit seed g... more Low temperature or cold is one of the most important stress factors that control and limit seed germination, young seedling development, growth and development of the adult plant as well as plant distribution worldwide. There are several reports of altered gene expression in plants in response to and during cold acclimation and conclude that cold-responsive genes provide the biochemical and physiological changes necessary for growth and development at low temperature. Indeed, when the plants are exposed to cold stress, cold- or chilling-tolerant plants reprogramme their transcriptome in response to cold adaptation. It is an established fact that the ICE-1-CBF transcriptional cascade plays crucial role in cold acclimation in diverse plant species, and through transgenic approaches the genetic manipulation of CBF pathway can improve cold tolerance of resultant transgenics. On the other hand, studies have revealed that, besides transcriptional regulation, plants employ diverse post-transcriptional regulatory mechanisms to modulating their gene expression patterns during cold acclimation.
Low temperature or cold is one of the most important stress factors that control and limit seed g... more Low temperature or cold is one of the most important stress factors that control and limit seed germination, young seedling development, growth and development of the adult plant as well as plant distribution worldwide. There are several reports of altered gene expression in plants in response to and during cold acclimation and conclude that cold-responsive genes provide the biochemical and physiological changes necessary for growth and development at low temperature. Indeed, when the plants are exposed to cold stress, cold- or chilling-tolerant plants reprogramme their transcriptome in response to cold adaptation. It is an established fact that the ICE-1-CBF transcriptional cascade plays crucial role in cold acclimation in diverse plant species, and through transgenic approaches the genetic manipulation of CBF pathway can improve cold tolerance of resultant transgenics. On the other hand, studies have revealed that, besides transcriptional regulation, plants employ diverse post-transcriptional regulatory mechanisms to modulating their gene expression patterns during cold acclimation.
In order to have more information on early seedling development under salinity stress (one of the... more In order to have more information on early seedling development under salinity stress (one of the important factors limiting plant productivity and also crop growth), it will be interesting to examine radicle growth in comparison to plumule elongation under different salinity stress conditions. In this study, we assessed the variability of four genotypes of the plant model Medicago truncatula under four levels of salt stress (distilled water as control 0, 68, 102 and 137 mM) of sodium chloride (NaCl) solution. Several studies are focalised in root or radical development because is the most sensitive part of the plant and controls rapid transmission information to other plant parts. In order to evaluate the degree of radicle sensitivity, we measured the plumule length to radicle length ratio (PL: RL ratio). Also, we investigated the relationship between storage protein content, seed weight and salinity tolerance degree. The results show that Tru 131 and Tru 673 genotypes, with a low ...
Salt stress is a major environmental constraint most limiting plant productivity. Seeking salt-to... more Salt stress is a major environmental constraint most limiting plant productivity. Seeking salt-tolerant crops requires an examination of the behavior of the plant development including seed germination stage. The effects of NaCl stress (100 mM) combined or not with different solutions of phytohormones ABA (0.005 mM), GA3 (0.005 mM) and SA (0.5 mM) on germination of two processing tomato cultivars named Rio Grande (Rg) and Imperial (Ip) were investigated. Seeds were subjected to salt stress, combined or not with hormones, at two stages of development (48 and 96 hours). The results shows that the germination rate and germinate value of the two processing cultivars of tomato were influenced by the different treatments. On the other hand, salicylic acid as GA3 attenuate the effect of NaCl. Instead, the middle enriched with ABA inhibits seed germination. Moreover, the tested stress conditions had shown a significant variability in the germination and handling between the two germination ...
Environmental degradation and the decrease of ecosystem service provision are currently of major ... more Environmental degradation and the decrease of ecosystem service provision are currently of major concern, with current agricultural systems being a major driver. To meet our future environmental and sustainability targets a transformation of the agro-food systems and current agricultural value chain are crucial. One approach to redesign farming systems is the concept of biodiversity-based agriculture (BBA) which relies on sustainable diversification of biological components and their natural interactions in farming systems to maximize fertility, productivity, and resilience to external perturbations. Despite minimizing anthropogenic inputs, BBA is not yet able to meet all beneficial environmental objectives. BBA applied in the Mediterranean basin requires urgent innovation in approaches, methodologies, and models for small-holder traditional farming systems to ensure a stable provision of ecosystem services and better resilience to environmental stresses linked to climate change. Le...
In Algeria, the region of Mostaganem is known for its agricultural soils with a sandy tendency an... more In Algeria, the region of Mostaganem is known for its agricultural soils with a sandy tendency and abnormally loaded with soluble salts affecting the yields of crops. To assess the salt tolerance threshold of the bean culture Phaseolus vulgaris L. (Fabales Fabaceae) variety “coco rose” was grown in plastic pots filled with two types of substrate, sand and sand amended with 7% bentonite (calcium clay of mining origin). The test was carried out in a greenhouse with controlled climatic conditions (variant temperature between 23-25°C, humidity is around 75% and a photoperiod of 12 hours). At the 5-leaf stage, irrigation with saline was provided with four saline concentrations (0, 50, 100 and 200 meq), the control is irrigated with distilled water. Two weeks later, the microscopic observations were made with an Optica type microscope, the results show a variability of the effect of saline stress depending on the organ and the concentration of the saline treatment. The anatomical structur...
Biotic and abiotic stresses impose a major threat to agriculture. Increase crop productivity need... more Biotic and abiotic stresses impose a major threat to agriculture. Increase crop productivity need to develop stress tolerant plants. Tomato ( Lycopersicon esculentum Mill.) is a model plant for studying the mechanisms of plant salt tolerance. Plants may be exposed to different salt levels at various stages of development; seed germination represents a major bottleneck in the species life cycle. In this context, seeds of eight varieties of tomato were tested under different levels of NaCl. Two approaches were adopted in this investigation: (a) Morphometric variability measurement, (b) biochemical changes of protein profile and iso-enzyme esterase activity. For the morphometric variability, two quantitative components were measured, vigor seed and length of seedling, for each parameter tolerance index (IT = treated / control) was evaluated. Statistical analysis was carried by software STATISTICA (version6. France). One-way ANOVA analysis indicates a significant difference between trea...
ABSTRACT A comparative analysis of cold tolerance of the male gametophyte and the sporophyte has ... more ABSTRACT A comparative analysis of cold tolerance of the male gametophyte and the sporophyte has been undertaken on four varieties of tomato. The seed germination rate and the growth rate of the young plants have been assessed at sporophytic stage, atter a stress exposition of variable duration to a constant temperature of 4 °C. The pollen germination rate and the tube growth have been recorded at the gametophytic stage under the same cold stress. The sporophyte data analysis showed that the four varieties differed significantly between themselves with or without stress application for both their seed germination rate and their post-germinative growth. The Saint-Pierre variety appeared as the most tolerant and the variety Marmande as the least tolerant. In contrary, data on pollen grain indicate that the relative degree of tolerance of each variety changed with treatement duration and the trait analysed. These results showed that differences observed between varieties for germination rate and post-germinative growth rate under low temperature are partially reflected at the gametophytic level. Key words : germination - pollen - seeds - tomato - cold temperature - stress -pollen selection.
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