Drought and salinity alter endogenous hormonal profiles at the seed germination phase

Llanes, Analía; Andrade, Andrea; Masciarelli, Oscar; Alemano, Sergio; Luna, Virginia

doi:10.1017/s0960258515000331

Cited by 50 publications

(32 citation statements)

References 121 publications

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“…Seedling development is affected by the decline of phytohormones levels, such as auxins, gibberellins, jasmonic acid and salicylic acid in plant tissues. This decrease is associated with the toxic effect of NaCl excess on plants [26,27]. The reduction of these plant hormones along with a decrease in the osmotic potential, caused by saline stress, results in a smaller number of cell divisions.…”

Section: Table 1 a Comparative Test Of Averages For Germination Ratementioning

confidence: 99%

Effect of Salinity on Germination of Lettuce Cultivars Produced in Brazil

Rosas

Marques

Lorenzoni

et al. 2019

JEAI

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The challenge of recovering degraded soils due to salinity excess leads to the search for more effective strategies that can overcome this problem. Among these, one of the approaches is the use of resistant plant varieties in affected areas. This study aimed to evaluate the influence of different doses of salts on seed germination and seedling formation of two lettuce cultivars (Hanson and H121) and to verify the existence of tolerance among the cultivars. A completely randomized design was used in a 2x5x4 factorial scheme, where the cultivars were evaluated under five distinct salt doses (0, 25, 50, 75 and 100 mol.m-3, conductivities of 0.0, 2.8, 5.4, 8.0 and 10.6 dS.m-1, respectively), with four replicates. In this sense, the following variables were evaluated: germination rate (GR), germination speed index (GSI), seedling height (SH), root length (RL) and percentage of dry matter in relation to fresh matter (DM%). As a result, the Hanson cultivar presented better performance than the H121, under all the different salt doses, in all the studied variables. Also, the EC of 2.8 dS.m-1 did not affect any of the studied variables, including both cultivars. However, EC above 2.8 dS.m-1had, significantly, reduced the development of the cultivars. The Hanson cultivar was influenced only in the variables SH, RL and DM%, where and DM% were influenced by EC values above 8.0 and 10.6 dS.m-1, respectively. The cultivar H121 was significantly influenced by all evaluate dvariables, which demonstrates its greater susceptibility to salinity.

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Section: Table 1 a Comparative Test Of Averages For Germination Ratementioning

confidence: 99%

Effect of Salinity on Germination of Lettuce Cultivars Produced in Brazil

Rosas

Marques

Lorenzoni

et al. 2019

JEAI

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“…A marked and positive influence of the period in freshwater was observed, which reduced, at least in part, the negative effects of salinity (even if Cox PH results applied to the entire trial, i.e., germination + recovery, should be interpreted with prudence, as salinity changed between germination and recovery trial for most treatments, infringing assumptions). Germination resumption under freshwater conditions might have adaptive consequences, as it prevents emergence under harsh environmental conditions, ensuring a higher chance for proper seedling establishment [117,118]. This species can tolerate up to 150 mM NaCl salt stress (at least for two months, (Figure 3a) and (Figure 5b), taking advantage of a prolonged chilling or recovery period, even if in both cases hazard rate for seed germination in high salinity remains low and about 25% and 50% of control values (Table 4).…”

Section: Recoverymentioning

confidence: 99%

Salinity Tolerance in Fraxinus angustifolia Vahl.: Seed Emergence in Field and Germination Trials

Raddi

Mariotti

Sofía

et al. 2019

Forests

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The effect of salinity on seed germination/emergence in narrow-leaved ash (Fraxinus angustifolia) was studied both under field and laboratory conditions, in order to detect critical values to NaCl exposure. Research Highlights: Novel statistical methods in germination ecology has been applied (i) to determine the effects of chilling length and salinity (up to 150 mM NaCl) on Fraxinus angustifolia subsp. oxycarpa seed emergence, and (ii) to estimate threshold limits treating germination response to salinity as a biomarker. Background and Objectives: Salinity cut values at germination stage had relevant interest for conservation and restoration aims of Mediterranean floodplain forests in coastal areas subjected to salt spray exposure and/or saline water introgression. Results: Salinity linearly decreased germination/emergence both in the field and laboratory tests. Absence of germination was observed at 60 mM NaCl in the field (70-84 mM NaCl depending on interpolation model) and at 150 mM NaCl for 4-week (but not for 24-week) chilling. At 50 mM NaCl, germination percentage was 50% (or 80%) of control for 4-week (or 24-week) chilling. Critical values for salinity were estimated between freshwater and 50 (75) mM NaCl for 4-week (24-week) chilling by Bayesian analysis. After 7-week freshwater recovery, critical cut-off values included all tested salinity levels up to 150 mM NaCl, indicating a marked resumption of seedling emergence. Conclusions: Fraxinus angustifolia is able to germinate at low salinity and to tolerate temporarily moderate salinity conditions for about two months. Prolonged chilling widened salinity tolerance.Forests 2019, 10, 940 2 of 18 and late (2100) century [22]. The global conservation awareness for these ecosystems-which nowadays resulted in a protected status under the international biodiversity-related multilateral environmental agreements [23] for more than one third of swamps, flooded forests and coastal wetlands-might not be sufficient to prevent degradation risks arisen from interactions with large-scale processes, land-use changes and agricultural land-use intensification. Consequently, undertaking practice and policy actions to prevent wetland degradation and loss remains a focus of international processes, such as the Convention on Biological Diversity (CBD) Aichi Targets and the United Nations (UN) Sustainable Development Goals (SDGs). In coastal floodplains, human pressure, altered water flows, contaminants from internal urban and agricultural lands, and increased soil salinity [24][25][26] were particularly relevant, and science-based management options should be urgent [27] to face adverse climate-related impacts exacerbated by increasing human-induced pressures [28][29][30].F. angustifolia coastal alluvial forests were mainly judged under unfavorable (habitat 91F0) or inadeguate (habitat 91E0 * ) states, following the 2007-2012 EU Habitat Directive Art. 17 assessment [31]. The major threats to this species were currently considered to be high fragmentation with connectivity loss a...

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“…Salinity and drought stress are becoming particularly widespread in many regions and may affect more than 50 % of all arable land by 2050 [4]. While, both stresses repress plant growth and development due to the imposed osmotic stress, only salinity stress affects productivity of agricultural crops through ion toxicity [5][6][7]. Some plants have developed morphological, structural and functional adaptive strategies to cope with both stresses [8].…”

Section: Introductionmentioning

confidence: 99%

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

et al. 2018

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Switchgrass (Panicum virgatum L.) is a warm perennial grass with valuable characteristics as a biofuel crop. To avoid competition with food crops, biofuel crops will be likely relegated to less productive soils such as marginal lands. Consequently, the salinity and water scarcity problems that commonly affect marginal lands, compromise biofuel crops germination, emergence and seedling establishment. The aims of this study were to study the germination and seedling growth of switchgrass under salinity and water stress, and to describe the morpho-anatomical responses of the roots and leaves in the seedlings to these stresses. The effect of salt and water stress was assessed using sodium chloride (NaCl) and polyethylene glycol 8000 (PEG) at the same water potentials of-0.8,-1.0 and-1.2 MPa. Seeds were moist prechilled for 7 days at 5 ºC and germinated at 30ºC/15 ºC (8 h light/16 h dark). NaCl treatments (-0.8 and-1.0 MPa) delayed germination rates but did not reduce the final germination percentage, whereas at a lower potential (-1.2 MPa) the final germination percentage was diminished. The effects of PEG (-1.0 and-1.2 MPa) on the germination rate and final percentage, were more detrimental than those induced by iso-osmotic concentrations of NaCl. PEG and NaCl reduced significantly the vigor index of-0.8 to-1.2 MPa. The morpho-anatomical changes such as the reduction in the root cross-section area and the thickening of the endodermis walls for both stress conditions and aerenchyma formation in the cortex under salinity, could significantly contribute in the survival and tolerance during the early seedling stages.

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Drought and salinity alter endogenous hormonal profiles at the seed germination phase

Cited by 50 publications

References 121 publications

Effect of Salinity on Germination of Lettuce Cultivars Produced in Brazil

Effect of Salinity on Germination of Lettuce Cultivars Produced in Brazil

Salinity Tolerance in Fraxinus angustifolia Vahl.: Seed Emergence in Field and Germination Trials

Morpho-Physiological Responses of Alamo Switchgrass During Germination and Early Seedling Stage Under Salinity or Water Stress Conditions

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