Effects of long‐term salt stress on antioxidant defence systems, leaf water relations and chloroplast ultrastructure of potato plants

Fidalgo, Fernanda; Santos, Álvaro da Silva; Santos, Iraci dos; Salema, R.

doi:10.1111/j.1744-7348.2004.tb00374.x

Cited by 99 publications

(73 citation statements)

References 53 publications

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“…In our study, the increase in NaCl concentration in media reduced growth rate of potato callus lines cultivated in the presence of NaCl. In fact, the reduction in growth is a common phenomenon of salt stressed plants (Benavídes et al 2000, Fidalgo et al 2004, Sotiropoulos et al 2006, which has also been observed in cultured cells on medium supplemented with NaCl (Rus et al 1999, Shankhdhar et al 2000, Gu et al 2004, Lutts et al 2004, Niknam et al 2006. As reported by Zhu (2001), slower growth is an adaptive feature for plant survival under stress and the extent of salt tolerance often appears to be inversely related to growth rate.…”

Section: Discussionmentioning

confidence: 88%

In vitro selection of salt tolerant cell lines in Solanum tuberosum L.

Queirós¹,

Fidalgo²,

Santos³

et al. 2007

Biol. plant.

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Cell lines able to grow on media containing 50, 100, 150 or 200 mM NaCl were established from potato callus cultures by direct recurrent selection or gradual selection. In callus subjected to direct selection only small clusters of cells survived on medium with 150 or 200 mM NaCl, whereas on 100 mM small cell portions appear necrotic. When cell lines were obtained by successive subcultures on media with increased concentrations of NaCl, salt-tolerant calli were more compact and developed a greenish colour free from necrotic areas. The response of calli lines grown on media with NaCl was compared to control line. The NaCl-tolerant calli showed a decrease in relative growth rate and water content, with higher reductions in the 150 mM tolerant callus. Lipid peroxidation was increased in 50 mM and 100 mM NaCl-tolerant calli, while in 150 mM tolerant callus remained similar to 100 mM values. There was a significant increase in ascorbic acid content in 100 mM and 150 mM NaCl-tolerant calli as compared to the 50 mM, that was twofold the value found in the control. Also, the contents of soluble and insoluble proteins increased in salt-tolerant lines. SDS-PAGE of soluble proteins showed the synthesis of specific polypeptides in the presence of NaCl in culture medium and the synthesis of a new polypeptide.

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Section: Discussionmentioning

confidence: 88%

In vitro selection of salt tolerant cell lines in Solanum tuberosum L.

Queirós¹,

Fidalgo²,

Santos³

et al. 2007

Biol. plant.

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“…Saline water irrigation negatively influenced the leaf fresh weight, without significant effects on leaf number, dry weight, and surface, supporting that salt stress mainly reduces leaf water content (Fidalgo et al 2004) [59]. Moreover, salinity stress did not exert any significant effects on SPAD values in either of genotypes, despite this stress resulting in chlorophyll damage, with a reduction in photosynthetic activity and leaf senescence acceleration (Shi and Guo, 2006;Beltrano et al 2013) [60,61].…”

Section: Field Experimentsmentioning

confidence: 85%

Responses of Different Panicum miliaceum L. Genotypes to Saline and Water Stress in a Marginal Mediterranean Environment

et al. 2018

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Abstract:The aims of this study were to evaluate: (1) the effect of sodium chloride (NaCl) and mannitol at different osmotic pressures on the germination of three proso millet (Panicum miliaceum L.) genotypes (VIR 9181, Unikum, and Kinelskoje) under controlled laboratory conditions; and (2) the effects of irrigation water salinity, maximum crop evapotranspiration (ETm) restitution regimes, and arbuscular mycorrhizal fungi (AMF) inoculation on forage production in a marginal Mediterranean soil for the genotypes that showed the highest and lowest seed germination. In the laboratory experiment, the Unikum genotype showed the highest seed germination (95.1%), whereas the lowest was found for Kinelskoje (80.4%). Regardless of the osmoticum type, germination was significantly reduced by osmotic pressure increases. Unikum showed a higher fresh biomass yield (FBY) (620.4 ± 126.3 g m −2 ) than Kinelskoje (340.0 ± 73.5 g m −2 ). AMF inoculation did not influence FBY under salt conditions, while in the absence of salt conditions it significantly increased the Unikum FBY (+50.7%) as compared to the uninoculated treatment (552.5 ± 269 g m −2 ). The 25% ETm significantly reduced FBY in both genotypes (−86.2% and −84.1% for Unikum and Kinelskoje, respectively) sd compared to the 100% ETm treatments (1090.3 ± 49.7 g m −2 in Unikum and 587 ± 72.2 g m −2 in Kinelskoje). The obtained results give novel information about proso millet forage production in low-input agriculture in marginal semi-arid Mediterranean land.

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“…Generally, photosynthesis is inhibited by salt stress (Ma et al 1997, Sultana et al 1999, Qiu et al 2003, Koyro 2006. Salt stress also affects photosynthetic components (Ma et al 1997, Qiu et al 2003 and chloroplast ultrastructure (Fidalgo et al 2004). However, there are few reports on the effects of alkali stress on photosynthesis.…”

Section: Introductionmentioning

confidence: 99%

Photosynthesis, chlorophyll fluorescence, inorganic ion and organic acid accumulations of sunflower in responses to salt and salt-alkaline mixed stress

Liu

Shi

2010

Photosynt.

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Sunflowers were treated with mixing proportions of NaCl, Na 2 SO 4 , NaHCO 3 , and Na 2 CO 3 . Effects of salt and saltalkaline mixed stress on growth, photosynthesis, chlorophyll fluorescence, and contents of inorganic ions and organic acids of sunflower were compared. The growth of sunflower decreased with increasing salinity. The contents of photosynthetic pigments did not decrease under salt stress, but their contents decreased sharply under salt-alkaline mixed stress. Net photosynthetic rates, stomatal conductance and intercellular CO 2 concentration decreased obviously, with greater reductions under salt-alkaline mixed stress than under salt one. Fluorescence parameters showed no significant differences under salt stress. However, maximal efficiency of PSII photochemistry, photochemical quenching coefficient, electron transport rate, and actual PSII efficiency significantly decreased but non-photochemical quenching increased substantially under salt-alkaline mixed stress. Under salt-alkaline mixed stress, sunflower leaves maintained a low Na + -and high K + status; this may be an important feature of sunflower tolerance to salinity. Analysis of the mechanism of ion balance showed that K + but not Na + was the main inorganic cation in sunflower leaves. Our results indicated that the change in organic acid content was opposite to the change of Cl -, and the contribution of organic acid to total charge in sunflower leaves under both stresses decreased with increasing salinity. This may be a special adaptive response to stresses for sunflower. Sunflower under stress conditions mainly accumulated inorganic ions instead of synthesizing organic compounds to decrease cell water potential in order to save energy consumption.

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Effects of long‐term salt stress on antioxidant defence systems, leaf water relations and chloroplast ultrastructure of potato plants

Cited by 99 publications

References 53 publications

In vitro selection of salt tolerant cell lines in Solanum tuberosum L.

In vitro selection of salt tolerant cell lines in Solanum tuberosum L.

Responses of Different Panicum miliaceum L. Genotypes to Saline and Water Stress in a Marginal Mediterranean Environment

Photosynthesis, chlorophyll fluorescence, inorganic ion and organic acid accumulations of sunflower in responses to salt and salt-alkaline mixed stress

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