Ion Homeostasis in NaCl Stress Environments

Niu, Xiaomu; Bressan, Ray A.; Hasegawa, Paul M.; Pardo, José M.

doi:10.1104/pp.109.3.735

Cited by 756 publications

(482 citation statements)

References 46 publications

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“…Entretanto, diferenças signifi cativas não foram evidenciadas entre as CEs 1,7 e 6,03 dS m -1 , para a produção de matéria seca de raiz e parte aérea. Esses resultados se devem à possível capacidade dessas plantas se ajustar osmoticamente, acumulando no vacúolo os íons Na + e Cl -, os quais chegam ao mesofi lo foliar (Niu et al 1995;Ashraf & Harris 2004), ou sintetizando e acumulando solutos orgânicos que restauram a osmolaridade da célula (Munns & Tester 2008). O acúmulo desses íons ou solutos permite a manutenção de um gradiente de potencial hídrico ao longo da planta, resultando na absorção e transporte de água até a parte aérea, mesmo que o solo esteja salinizado.…”

Section: Resultsunclassified

Germinação de sementes osmocondicionadas e não osmocondicionadas e crescimento inicial de Physalis angulata L. (Solanaceae) em ambientes salinos

Souza

Pelacani

2011

Acta Bot. Bras.

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Germinação de sementes osmocondicionadas e não osmocondicionadas e crescimento inicial de Physalis angulata L. (Solanaceae) em ambientes salinos RESUMO (Germinação de sementes osmocondicionadas e não osmocondicionadas e crescimento inicial de Physalis angulata L. (Solanaceae) em ambientes salinos). O gênero Physalis pertencente à família Solanaceae, possui 110 espécies, das quais 11 ocorrem no Brasil. Physalis angulata L. destaca-se no gênero pela presença de vitaesteróides, principalmente as fi salinas, encontradas em raízes, caules e folhas, com propriedades imunomoduladora, antimicrobiana e anticancerígena. Este trabalho teve por objetivo avaliar a germinabilidade de sementes osmocondicionadas e não osmocondicionadas e o crescimento inicial de P. angulata em ambientes salinos. Foram realizados experimentos nos quais as sementes foram submetidas ao osmocondicionamento (PEG 6000) e colocadas para germinar em soluções com diferentes concentrações de NaCl (2, 4, 6, 10, 12, 14 e 16 dS m -1 ). O controle (0 dS m -1 ) foi realizado com água destilada. Os parâmetros avaliados foram a germinabilidade das sementes, o índice de velocidade de germinação das sementes (IVG), o coefi ciente de uniformidade de germinação e a massa seca total das plântulas. Houve diminuição da germinabilidade e do IVG, em ambos os tratamentos. No entanto, as sementes osmocondicionadas apresentaram maior tolerância ao estresse salino. Apesar da redução signifi cativa da massa seca em relação ao aumento da salinidade do meio, o osmocondicionamento como tratamento pré-germinativo poderia ser utilizado para favorecer a tolerância ao estresse salino, uma vez que a germinabilidade foi maior para sementes osmocondicionadas.Palavras-chave: NaCl, massa seca, PEG 6000, salinidade, taxa de germinação Manuela Oliveira de Souza 1,2 , Cíntia Luiza Mascarenhas de Souza 1 e Claudinéia Regina Pelacani 1 ABSTRACT (Germination of osmoprimed and non-osmoprimed seeds and initial growth of Physalis angulata (Solanaceae) in saline environments). Th e genus Physalis belongs to the Solanaceae family, with 110 species, of which 11 occur in Brazil. Physalis angulata L. stands out in the genus due to the presence of vitasteroids, especially physalins, found in roots, stems and leaves, showing antimicrobial, anticancer and immunomodulatory properties. Th is study aimed to evaluate the germination of osmotic priming treatment and non-primed seeds and the initial growth of P. angulata in saline environments. Th e seeds were subjected to priming (PEG 6000) and incubated in solutions with increasing concentration of NaCl (2, 4, 6, 10, 12, 14 and 16 dS m -1 ). Distilled water was used as control (0 dS m -1 ). Th e parameters evaluated were seed germinability, rate of germination, coeffi cient of uniformity and total dry mass of seedlings. A decrease in germinability and IVG was observed in both treatments. However, primed seeds showed higher tolerance of salt stress. Despite the signifi cant reduction in dry mass with increasing salinity, priming as a pre-germinative treatme...

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Section: Resultsunclassified

Germinação de sementes osmocondicionadas e não osmocondicionadas e crescimento inicial de Physalis angulata L. (Solanaceae) em ambientes salinos

Souza

Pelacani

2011

Acta Bot. Bras.

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“…Estimates predict that a large portion of the world's irrigated areas are degraded due to salinization (FAO, 2011;Gupta and Huang, 2014). Salinity can negatively affect plant growth and crop yield, particularly due to the osmotic and toxic effects from saline ions (Niu et al, 1995;Munns and Tester, 2008;Munns, 2010). Saline ions excessively absorbed by plants can lead to ionic toxicity, which is accumulated in the protoplasm.…”

Section: Introductionmentioning

confidence: 99%

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Cavalcante¹,

Santos²,

Filho³

et al. 2018

Aust J Crop Sci

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The aim of the current study is to assess the growth response, biochemical changes, photosynthetic pigments content and gas exchanges of physic nut (Jatropha curcas) grown under natural saline conditions. The experiment was arranged in a completely randomized design based on the following soil electrical conductivities: 0.29 dS.m -1 (control), 1.76 dS.m -1 (moderate salt concentration), 2.61 dS.m -1 (high salt concentration), 3.79 dS.m -1 (very high salt concentration). Physic nut plants were kept under saline conditions for 19 days in greenhouse. Plant growth analyses were performed on a weekly basis. Plant biomass allocation was quantified at the end of the experiment. Leaf gas exchange, stomatal conductance, Fv/Fm and quantum yield were quantified 102 days after planting. Photosynthetic pigments, amino acids, proline and carbohydrates in fresh leaf tissue were also quantified. The leaf antioxidant enzymes catalase (CAT) and ascorbate peroxidase (APX) were quantified. Although there was no alteration in biomass allocation, the initial growth of J. curcas was gradually reduced by increasing salt concentration, which was observed through reduced plant height, stem diameter, and total number of leaves. Soil electrical conductivity 3.79 dS.m -1 was lethal to seedlings. Seedlings exposed to salt stress had their photosynthesis, stomatal conductance, transpiration and effective photochemical efficiency reduced, and their catalase and ascorbate peroxidase enzyme activity increased. Amino acids, proline and carbohydrate concentrations increased due to salt stress, whereas there was decrease in the chlorophyll content. J. curcas is sensitive to soil salinity at electrical conductivity levels higher than 1.76 dS.m -1 . To some extent, salinity effects can be relieved by osmolyte accumulation and by greater antioxidant activity; however, these factors were not sufficient to keep plant growth within normal rates.

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“…(There is need to know about the response of nitrogen assimilation of cyanobacterium to NaCl stress due to reported involvement of nitrogen nutrition in amelioration of the NaCl toxicity to cyanobacteria) (Apte and Bhagwat, 1989;Waditee et al, 2001;Soltani et al, 2007). Further, it would be interesting to study the effect of salinity stress on the membrane transport of NH 4 + , when the primary target of salinity is the cyanobacterial membrane system (Niu et al, 1995;Binzel et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

Salt tolerant mutant of Anabaena doliolum exhibiting efficient ammonium uptake and assimilation

Kshatriya

Singh

2009

Physiol Mol Biol Plants

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Effect of salinity (NaCl, 100 mM) on growth, nitrate reductase (NR) and glutamine synthetase (GS) activities, and uptake of NH 4 + was studied in the wild type (WT) and the NaCl-tolerant mutant type (MT) of cyanobacterium Anabaena doliolum. Results obtained in the presence of salt showed significant reduction in the growth rate of both WT and MT cells of A. doliolum by about 77.8 and 40 %, respectively over without NaCl. Similarly rate of NR activity in both WT and MT strains was reduced by 45.5 and 44.5 %, respectively. On the contrary, rate of GS activity of both the WT and MT strains in the presence 100 mM of NaCl increased by 34 and 159 %, respectively. The results of this study indicate that tolerance to NaCl in A. doliolum is more dependent on NH 4 + assimilation rather than on nitrate assimilation in relation to N-metabolism. The increased GS activity in MT cells of the cyanobacterium is possibly because of high rate of energy dependent NH 4 + uptake.

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Ion Homeostasis in NaCl Stress Environments

Cited by 756 publications

References 46 publications

Germinação de sementes osmocondicionadas e não osmocondicionadas e crescimento inicial de Physalis angulata L. (Solanaceae) em ambientes salinos

Germinação de sementes osmocondicionadas e não osmocondicionadas e crescimento inicial de Physalis angulata L. (Solanaceae) em ambientes salinos

Morpho-physiological adaptation of Jatropha curcas L. to salinity stress

Salt tolerant mutant of Anabaena doliolum exhibiting efficient ammonium uptake and assimilation

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