Salinity effects on germination, growth, and seed production of the halophyte Cakile maritima

Debez, Ahmed; Hamed, Karim Ben; Grignon, Claude; Abdelly, Chédly

doi:10.1023/b:plso.0000037034.47247.67

Cited by 245 publications

(183 citation statements)

References 51 publications

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“…This is consistent with other studies of germination of halophytes in which germination was suppressed at high salinities but seeds were able to subsequently germinate in freshwater (Ungar 1996;Debez et al 2004;Qu et al 2008). Imbibition of freshwater is required before germination but is inhibited by seawater due to the low relative water concentration in the presence of such a high salt concentration (Debez et al 2004). This may be a mechanism to prevent premature germination in the ocean during dispersal.…”

Section: Salinity Germination Effectssupporting

confidence: 81%

Seed dispersal but not seed germination facilitated by seabirds: seed ecology of Cook’s scurvy grass

Dale¹,

Lange²,

Burns³

2017

NZ J Ecol

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Lepidium oleraceum (Brassicaceae) is a threatened New Zealand plant closely associated with seabird colony environments. We hypothesise that this spatial coincidence arises from seabird dispersal of L. oleraceum seed and/or guano stimulating germination. To test the possibility of seabird epizoochory, we used laboratory studies to examine L. oleraceum seed adhesion and tolerance to seawater immersion. To test for stimulation of germination by guano we measured seed germination in increasing concentrations of seabird guano or inorganic fertiliser (to separate a nutrient effect from a possible effect from some other unknown constituent). Seeds developed a sticky mucilage layer after 50 seconds in freshwater and 50% were able to adhere to dry paper for over 24 months. A higher proportion of seeds germinated after soaking in freshwater (91% ± 3.1%) than seawater (44% ± 4.9%), and seawater germination was comparable to unsoaked controls (46% ± 3.1%).A comparison of germination rates under different concentrations of guano and fertiliser showed no significant differences associated with treatments except germination was inhibited above 1 gNL -1 . We conclude that seabirds are probable dispersers of L. oleraceum seed through external attachment, but germination is not promoted by guano presence.

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Section: Salinity Germination Effectssupporting

confidence: 81%

Seed dispersal but not seed germination facilitated by seabirds: seed ecology of Cook’s scurvy grass

Dale¹,

Lange²,

Burns³

2017

NZ J Ecol

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“…Germination is a critical stage in the life cycle of a higher plant and is probably the stage at which it is most vulnerable to adverse external factors including to various abiotic stresses (Debez et al, 2004). Our results indicate that water stress had a strong inhibitory effect on germination, with germination rates gradually decreasing with increasing PEG concentration.…”

Section: Effects Of Water Stress On Germinationmentioning

confidence: 49%

Effects of Water Stress on Germination and Growth of Linseed Seedlings (Linum usitatissimum L), Photosynthetic Efficiency and Accumulation of Metabolites

Guo¹,

Hao²,

Gong³

2012

JAS

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Drought is a serious problem in many nations, adversely affecting both crop growth and yield. Here, we investigate the effects of water stress on growth, photosynthesis, physiology and germination in seedlings of linseed (Linum usitatissimum L). Water stress was imposed by exposing the sand-grown roots to irrigation with a range of concentrations of polyethylene glycol-6000 (PEG). Both relative growth rate (RGR) and water content (WC) decreased with increasing PEG concentration with the reductions being greatest for 20% PEG (water potential -0.58 MPa). The results show that as PEG concentration increased, the fluorescent chlorophyll and chloroplast pigments decreased but the ratio of Chl a/Chl b gradually increased. Meanwhile, shoot carbohydrate content increased slightly with increasing PEG concentration while that in the roots peaked at 5% PEG (-0.09 MPa) before decreasing at higher PEG concentrations. The content of proline in shoots and roots increased with increasing PEG concentration. With increasing PEG concentration, betaine showed a slight tendency to rise in the root, but to rise and then fall in the shoot. The results indicate that PEG-induced water stress increased the accumulations of carbohydrate, proline and betaine. These may help the linseed seedlings to survive periods of osmotic stress induced by drought and may be involved in the perception and transmission a drought signal, also playing a role in osmotic adjustment. Under water stress, the main inorganic ions involved in osmotic adjustment were K + , Na + , Ca 2+ and Cl -likely thereby increasing drought resistance. The germination percentage of the seeds was severely reduced by increasing PEG concentrations, ceasing altogether at 15% PEG. Many of the seeds that remained dormant in the higher PEG concentrations germinated satisfactorily when afterwards placed in pure water. The research provides useful leads in the planned development of linseed cultivars having increased drought tolerance.

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“…In the field, seed germination occurs in soil. In a soil environment, salinity has a strong impact on seed germination and impairs the establishment of seedlings in many species (Almansouri et al, 2001;Debez et al, 2004;Zapata et al, 2004). However, the mechanism of salt inhibition of seed germination (SSG) remains largely unknown.…”

mentioning

confidence: 99%

Salt Stress and Ethylene Antagonistically Regulate Nucleocytoplasmic Partitioning of COP1 to Control Seed Germination

Wang

Shi

et al. 2016

Plant Physiol.

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Seed germination, a critical stage initiating the life cycle of a plant, is severely affected by salt stress. However, the underlying mechanism of salt inhibition of seed germination (SSG) is unclear. Here, we report that the Arabidopsis (Arabidopsis thaliana) CONSTITUTIVE PHOTOMORPHOGENESIS1 (COP1) counteracts SSG. Genetic assays provide evidence that SSG in loss of function of the COP1 mutant was stronger than this in the wild type. A GUS-COP1 fusion was constitutively localized to the nucleus in radicle cells. Salt treatment caused COP1 to be retained in the cytosol, but the addition of ethylene precursor 1-aminocyclopropane-1-carboxylate had the reverse effect on the translocation of COP1 to the nucleus, revealing that ethylene and salt exert opposite regulatory effects on the localization of COP1 in germinating seeds. However, loss of function of the ETHYLENE INSENSITIVE3 (EIN3) mutant impaired the ethylene-mediated rescue of the salt restriction of COP1 to the nucleus. Further research showed that the interaction between COP1 and LONG HYPOCOTYL5 (HY5) had a role in SSG. Correspondingly, SSG in loss of function of HY5 was suppressed. Biochemical detection showed that salt promoted the stabilization of HY5, whereas ethylene restricted its accumulation. Furthermore, salt treatment stimulated and ethylene suppressed transcription of ABA INSENSITIVE5 (ABI5), which was directly transcriptionally regulated by HY5. Together, our results reveal that salt stress and ethylene antagonistically regulate nucleocytoplasmic partitioning of COP1, thereby controlling Arabidopsis seed germination via the COP1-mediated down-regulation of HY5 and ABI5. These findings enhance our understanding of the stress response and have great potential for application in agricultural production.

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Salinity effects on germination, growth, and seed production of the halophyte Cakile maritima

Cited by 245 publications

References 51 publications

Seed dispersal but not seed germination facilitated by seabirds: seed ecology of Cook’s scurvy grass

Seed dispersal but not seed germination facilitated by seabirds: seed ecology of Cook’s scurvy grass

Effects of Water Stress on Germination and Growth of Linseed Seedlings (Linum usitatissimum L), Photosynthetic Efficiency and Accumulation of Metabolites

Salt Stress and Ethylene Antagonistically Regulate Nucleocytoplasmic Partitioning of COP1 to Control Seed Germination

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