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Mansoura University (2010)

Induction of salt tolerant mutants in azotobacter and its effects on barley growth under salinity soil conditions

Abd Allah, Heba Hamed Atia

Titre : Induction of salt tolerant mutants in azotobacter and its effects on barley growth under salinity soil conditions

Auteur : Abd Allah, Heba Hamed Atia.

Etablissement de soutenance : Mansoura University

Grade : Master of Science (MS) in Agricultural Science 2010

Résumé
Barley (Hordeum vulgare L.) is widely grown in arid and semiarid regions of the mediterranean for forage purposes as a grain crop . It is rated as a moderately tolerant forage crop and a highly tolerant grain crop .Barley is the fourth most important cereal crop in the world . In conclusion the results of present investigation indicated that salt tolerant genes are plasmid-borne in most Azotobacte strains. Azotobacter salt tolerant mutants induced in this study were efficient in secrete IAA as a plant hormone. In addition, Azotobacter inoculants induced improved vegetative and biochemical traits of barley such as grains protein content and chlorophyll formation under abiotic stress. A barley crop Family grassy spread the important cultivated all over the world because of the interest they have food rich in protein and vitamins and is used in many food industries and pharmaceuticals. It has a high capacity to withstand saline soil conditions . Resulted from this study that most of the fertilizer produced a significant increase in the vital qualities of the growth of the barley crop plants is higher than the non-vaccinated through the experience of pots . We conclude that mutations Alozutobkatr tolerant of salinity had a positive impact on improving the rate of growth of barley plants in addition to improving the chemical qualities of growth and yield and its components in addition to carrying these mutations salinity to a range between 1.6 -10 % seawater . Salinity is considered one of the most important natural stress factors that affect the normal distribution of plants And M. Tule very serious problem in some agricultural areas . Limiting salt stress of growth of leguminous plants Especially when these crops depend on the installation of nitrogen Takaful . This study used five strains Alozotobakatr exposed to different concentrations of water Sea . Purpose of obtaining salinity -tolerant mutants were selected from two salt-tolerant mutants of Each strain on the basis of their production of indole acetic acid for use in vaccination barley plants .

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