Estresse salino em plântulas de milho: parte I análise do crescimento

Azevedo, André Dias de; Tabosa, J. N.

doi:10.1590/s1415-43662000000200005

Cited by 29 publications

(11 citation statements)

References 22 publications

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“…This result indicates that the effect of salinity was more pronounced in the shoot than in the root, suggesting that this organ is more tolerant to salt stress. Similar results were obtained by Azevedo Neto & Tabosa (2000), with maize plants under salt stress. These authors reported that the roots seem to better withstand salinity than the shoots, a phenomenon that could be associated with faster osmotic adjustment and slower loss of turgor in the roots, if compared to the shoots, in addition to providing a better protection against oxidative stress (Abreu et al 2008).…”

Section: Resultssupporting

confidence: 87%

Growth and contents of organic and inorganic solutes in amaranth under salt stress

Menezes

Neto

Ribeiro

et al. 2017

Pesqui. Agropecu. Trop.

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Amaranthus cruentus L. is a forage species, with grains that exhibit excellent nutritional characteristics, being the 'BRS Alegria' the first cultivar recommended for cultivation in Brazil. This study aimed at evaluating the effect of salt stress on the growth and concentrations of organic and inorganic solutes in Amaranthus cruentus L. ('BRS Alegria' cultivar). Height, stem diameter, number of leaves, leaf, stem and root dry mass, leaf area, relative water content and membrane integrity percentage, as well as soluble carbohydrate, free amino acid, soluble protein, free proline, Na+, Cl- and K+ contents, were evaluated in different plant organs. Salinity significantly reduced the biomass yield and leaf area from the treatment with 25 mM of NaCl, indicating that the 'BRS Alegria' cultivar is sensitive to salt stress. Soluble carbohydrates in the leaves decreased by 59 %, while the other organic solutes showed no substantial increases. These results, coupled with the reduction in the relative water content and membrane integrity, suggest a low ability of this cultivar to adjust osmotically under salt stress. The K+/Na+ ratio abruptly decreased in 25 mM of NaCl, suggesting an ionic imbalance, which may partially explain the salt-induced growth reduction.

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Section: Resultssupporting

confidence: 87%

Growth and contents of organic and inorganic solutes in amaranth under salt stress

Menezes

Neto

Ribeiro

et al. 2017

Pesqui. Agropecu. Trop.

Self Cite

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“…Competition between potassium and sodium under salt stress severely reduces potassium content in both leaves and roots of maize (Alberico and Cramer 1993;de Azevedo Neto and Tabosa 2000;Kaya et al 2010) and reduces potassium content by up to 64 % in the symplast of expanding tissues under salt stress (Shahzad et al 2012). Moreover, salt stress not only reduces potassium uptake rates but, to a greater extent, disturbs potassium translocation from root to shoot tissues in maize leading to lower potassium shoot contents than root contents (Shahzad et al 2012).…”

Section: Mineral Uptake and Assimilationmentioning

confidence: 99%

Salt stress in maize: effects, resistance mechanisms, and management. A review

Farooq

Hussain

Wakeel

et al. 2015

Agron. Sustain. Dev.

570

383

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Maize is grown under a wide spectrum of soil and climatic conditions. Maize is moderately sensitive to salt stress; therefore, soil salinity is a serious threat to its production worldwide. Understanding maize response to salt stress and resistance mechanisms and overviewing management options may help to devise strategies for improved maize performance in saline environments. Here, we reviewed the effects, resistance mechanisms, and management of salt stress in maize. Our main conclusions are as follows: (1) germination and stand establishment are more sensitive to salt stress than later developmental stages. (2) High rhizosphere sodium and chloride decrease plant uptake of nitrogen, potassium, calcium, magnesium, and iron. (3) Reduced grain weight and number are responsible for low grain yield in maize under salt stress. Sink limitations and reduced acid invertase activity in developing grains is responsible for poor kernel setting under salt stress. (4) Exclusion of excessive sodium or its compartmentation into vacuoles is an important adaptive strategy for maize under salt stress. (5) Apoplastic acidification, required for cell wall extensibility, is an important indicator of salt resistance, but not essential for better maize growth under salt stress. (6) Upregulation of antioxidant defense genes and β-expansin proteins is important for salt resistance in maize. (7) Arbuscular mycorrhizal fungi improve salt resistance in maize due to better plant nutrient availability. (8) Seed priming is an effective approach for improving maize germination under salt stress. (9) Integration of screening, breeding and ion homeostasis mechanisms into a functional paradigm for the whole plant may help to enhance salt resistance in maize.

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“…Resultados similares foram obtidos por AZEVEDO NETO & TABOSA (2000), que verificaram maior sensibilidade à salinidade no crescimento da parte aérea de plantas de milho, enquanto as raízes mantiveram seu desenvolvimento.…”

Section: Resultsunclassified

“…Assim, o comportamento de diferentes espécies agrícolas, como soja (SANTOS et al, 1996;CATUCHI et al, 2011), arroz (ROSHANDEL, 2007 e milho (AZEVEDO NETO & TABOSA, 2000;CONUS et al, 2009), tem sido objeto de estudo em diferentes condições de estresses ambientais, com destaque para o estresse salino e hídrico, visto que esses ambientes são cada vez mais frequentes na agricultura.…”

Section: Introductionunclassified