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Bacterial Diversity of Salt Tolerant Nitrogen Fixers Around the Salt Mines of Himachal Pradesh

CSK Himachal Pradesh Agricultural University Repository

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Title Bacterial Diversity of Salt Tolerant Nitrogen Fixers Around the Salt Mines of Himachal Pradesh
 
Creator Kapoor, Ritika
 
Subject 581.52 E Perspectives in Environmental Botany (Environment and pLant response)
 
Description The plant-associated habitat is a dynamic environment in which many factors may affect the structure and species composition of the bacterial communities. Soil salinity is one of the stress factors involved in the microbial selection process which can reduce microbial diversity and control microbial abundance, composition and functions (Ibekwe et al. 2010). As excess of sodium or other monovalent cations imbalances the osmotic potential, it generates water deficit and influx of sodium which may lead to metabolic toxicity (Hasegawa et al. 2000). Nearly 40 per cent of the world's land surface can be categorized as having potential salinity problems and most of these areas are confined to the tropics and mediterranean regions (Cordovilla et al. 1994). It is accounted for naturally present high salt levels, salt accumulation during irrigation or the application of chemical fertilizers. High salinity owing to its toxic effects inhibits the growth of plants by affecting cellular growth and ability of the root system to control the entry of ions by slowing down the water uptake of plants. Sodium chloride is the most destructive salt that affects the growth of plants (Flowers et al. 1977). To combat such stress, salt tolerant microorganisms play a vital role, as saline habitats are frequently inhabited by an abundance of microbial communities adapted to these ecosystems (Zaharan et al. 1992). Salt tolerant bacteria have been divided into three categories: (1) slight halophiles - grow best in media with 0.2 to 0.5 M NaCl (1- 3 per cent salt); (2) moderate halophiles - grow best with 0.5 to 2.5 M NaCl (3-15 per cent salt) and (3) extreme halophiles which show optimal growth in media containing 2.5 to 5.2 M NaCl (15- 32 per cent salt) (Ventosa et al. 2008). Moderately and extremely halophilic bacteria are the most important groups in hypersaline habitats which have received much attention from the microbiologists all over the world.
 
Date 2014
 
Type Thesis
NonPeerReviewed
 
Format text
 
Language en
 
Identifier http://hillagricrepository.co.in/766/1/Ritika%20Kapoor%20PhD%20Microbiology.pdf
Kapoor, Ritika (2014) Bacterial Diversity of Salt Tolerant Nitrogen Fixers Around the Salt Mines of Himachal Pradesh. PhD thesis thesis, CSKHPKV Palampur.