Salinity Stress and the Content of Proline in Roots of Pisum sativum and Tamarix tetragyna

Bar-Nun, Nurit; Poljakoff‐Mayber, A.

doi:10.1093/oxfordjournals.aob.a085265

Cited by 63 publications

(20 citation statements)

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“…The accumulation of these organic osmolytes is believed to constitute "osmotic adjustment", as they promote water uptake from a hyperosmotic environment (Hasegawa et al 2000;Maggio et al 2002). In many species, the concentration of proline can also be used as a biomarker to indicate the extent of salinity stress (Bar-Nun and Poljaoff-Mayber 1977). It is assumed that accumulating organic solutes in the cytoplasm demands more energy than accumulating inorganic ions (Greenway and Munns 1983;Munns 2002).…”

Section: Discussionmentioning

confidence: 99%

Effects of NO 3 − -N on the growth and salinity tolerance of Tamarix laxa Willd

et al. 2009

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Section: Discussionmentioning

confidence: 99%

Effects of NO 3 − -N on the growth and salinity tolerance of Tamarix laxa Willd

et al. 2009

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“…Exogenous proline application also increased percentage germination and root length in pea exposed to salinity stress. 99 In a study by Ehsanpour and Fatahian 52 on callus cells of Medicago sativa, proline supplied exogenously to the culture medium subjected to salinity stress resulted in an increase in dry weight and also increased free proline content in the callus cells. Exogenous addition of proline to nutrient medium drastically decreased the oxidative damage to membranes caused by salinity in Mesembryanthemum crystallinum L. thus resulting in reduced lipid peroxidation rate but increased the chlorophyll content in the leaves of salt stressed plants.…”

Section: Effect Of Exogenous Proline On Plants Exposed To Salinity Stmentioning

confidence: 98%

Role of proline under changing environments

Hayat

Alyemeni³

et al. 2012

Plant Signaling & Behavior

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“…The accumulation of compatible osmolytes is often considered to be a universal protective mechanism used by many plants under salt stress. Whether proline accumulation is an adaptive process or a response to salt stress injury remains open to question (Bar-Nun and Poljakoff-Mayer, 1977;Hanson et al, 1979;Richards and Thurling, 1979;Moftah and Michel, 1987). The salt-hypersensitive sos1 mutant in fact accumulates more proline than does the wild type (Liu and Zhu, 1997a).…”

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Genetic Analysis of Salt Tolerance in Arabidopsis: Evidence for a Critical Role of Potassium Nutrition

1998

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A large genetic screen for sos (for salt overly sensitive) mutants was performed in an attempt to isolate mutations in any gene with an sos phenotype. Our search yielded 28 new alleles of sos1 , nine mutant alleles of a newly identified locus, SOS2 , and one allele of a third salt tolerance locus, SOS3. The sos2 mutations, which are recessive, were mapped to the lower arm of chromosome V, ‫ف‬ 2.3 centimorgans away from the marker PHYC. Growth measurements demonstrated that sos2 mutants are specifically hypersensitive to inhibition by Na ؉ or Li ؉ and not hypersensitive to general osmotic stresses. Interestingly, the SOS2 locus is also necessary for K ؉ nutrition because sos2 mutants were unable to grow on a culture medium with a low level of K ؉ . The expression of several salt-inducible genes was superinduced in sos2 plants. The salt tolerance of sos1 , sos2 , and sos3 mutants correlated with their K ؉ tissue content but not their Na ؉ tissue content. Double mutant analysis indicated that the SOS genes function in the same pathway. Based on these results, a genetic model for salt tolerance mechanisms in Arabidopsis is presented in which SOS1 , SOS2 , and SOS3 are postulated to encode regulatory components controlling plant K ؉ nutrition that in turn is essential for salt tolerance. INTRODUCTIONExcessive salt accumulation in soils affects the productivity of one-third of the world's limited arable land (Epstein et al., 1980). Much effort has been devoted toward understanding the mechanisms of plant salt tolerance with the eventual goal of improving the performance of crop plants in saline soils (Binzel and Reuveni, 1994). Equally important, these efforts continue to yield valuable knowledge about plant osmotic stress responses as well as cellular ion homeostasis (Bohnert et al., 1995;Niu et al., 1995;Zhu et al., 1997).A widely used approach to unravel plant salt tolerance mechanisms has been to identify cellular processes and genes whose activity or expression is regulated by salt stress (reviewed in Hasegawa et al., 1987;Cushman et al., 1990;Skriver and Mundy, 1990;Bray, 1993;Bohnert et al., 1995;Zhu et al., 1997). The underlying assumption is that salt-regulated processes and genes likely function in salt tolerance. Although this correlative approach has contributed to our appreciation of the complex nature of plant responses to salinity, it has failed, to a large extent, to establish salt tolerance determinants (Zhu et al., 1997). There are numerous documented changes in cellular activities in higher plants in response to salt stress. Such changes include, for example, cell wall alterations (Jones and Turner, 1978;Iraki et al., 1989), declines in photosynthesis (Seemann and Critchley, 1985;Locy et al., 1996), protein synthesis (Singh et al., 1985;Hurkman and Tanaka, 1987), and potassium content (Rains, 1972;Greenway and Munns, 1980), and increases in Na ϩ (Watad et al., 1983;Serrano and Gaxiola, 1994) and organic solutes, such as proline, glycinebetaine, and polyols (Greenway and Munns, 1980;Yancey et al., 19...

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Salinity Stress and the Content of Proline in Roots of Pisum sativum and Tamarix tetragyna

Cited by 63 publications

References 6 publications

Effects of NO 3 − -N on the growth and salinity tolerance of Tamarix laxa Willd

Effects of NO 3 − -N on the growth and salinity tolerance of Tamarix laxa Willd

Role of proline under changing environments

Genetic Analysis of Salt Tolerance in Arabidopsis: Evidence for a Critical Role of Potassium Nutrition

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