Differential effects of four abiotic factors on the germination of salt marsh annuals

Noe, Gregory B.; Zedler, Joy B.

doi:10.2307/2656745

Cited by 114 publications

(75 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar trends have been found in several species of Atriplex, in some annual halophytes (Noe et al 2000;Debez et al 2001) and in Nicotiana tabacum (Niknam et al 2004). We found twenty-six-days salt treatment inhibited germination without damaging the seeds when the seeds, which did not germinate, were dissected to identify the viable seeds.…”

Section: Discussionsupporting

confidence: 79%

Effects of NaCl stress on seed germination, leaf gas exchange and seedling growth of Pteroceltis tatarinowii

Fang

Song

2006

J. of For. Res.

View full text Add to dashboard Cite

Effects of NaCl on seed germination, leaf gas exchange and seedling growth were investigated. The germination of P. tatarinowii seeds was delayed in the presence of NaCl, and was significantly inhibited when NaCl concentration exceeded 17 mM (1.0 g·L -1 ). NaCl treatments induced reductions of transpiration rate, stomatal conductance and net photosynthetic rate and their reductions were significant with the increasing of NaCl concentration. However, intercellular CO 2 concentration in seedling leaves under salt stress was significantly higher than that of controls. There was a significant reduction in survival, basal diameter increment and height increment with increasing NaCl concentration 50 days after NaCl treatment, and a significant reduction in the dry weight increment of roots, stems, and leaves was also observed in the NaCl treatments. The deleterious effect on the biomass increment was more evident in the case of stems and leaves. Results from this study suggest that P. tatarinowii is sensitive to salinity stress and the salinity threshold for seedling growth might be less 34 mM (2.0 g·L -1 ).

show abstract

Section: Discussionsupporting

confidence: 79%

Effects of NaCl stress on seed germination, leaf gas exchange and seedling growth of Pteroceltis tatarinowii

Fang

Song

2006

J. of For. Res.

View full text Add to dashboard Cite

show abstract

“…In general, our results corroborate those of Noe and Zedler (2000), who were not able to explain the distribution of ten salt marsh species on the basis of differential germination requirements. Rather, the abundance pattern of the three fescue species in nature appears to be related to differential establishment of seedlings.…”

Section: Discussionsupporting

confidence: 82%

Moisture conditions and the presence of bryophytes determine fescue species abundance in a dry calcareous grassland

Otsus

Zobel

2004

Oecologia

View full text Add to dashboard Cite

Festuca ovina is the abundant matrix-forming species and F. rubra a subordinate species in shallow-soil calcareous grasslands. F. pratensis is a transient species, occurring sparsely in this community. We hypothesised that the different abundances of these three species are primarily due to the differential effect of moisture conditions on their germination and early establishment, and that the effect of the pattern of rainfall intensity depends on the presence or absence of a bryophyte layer. We studied the dependence of the germination and establishment of the three fescue species on the moisture conditions both in the laboratory and in the patches of intact grassland community (microcosms). In a laboratory germination experiment, F. pratensis showed the highest, F. rubra, the intermediate and F. ovina, the lowest drought tolerance. In microcosms, the establishment of F. ovina was the highest. At the same time, the annual mortality of seedlings of F. ovina was the lowest. All three species responded positively to an increasing irrigation level. Differently from F. ovina, F. rubra showed a positive response only in plots from which the bryophyte layer had been removed, while F. pratensis responded positively to both irrigation and bryophyte removal. We conclude that moisture conditions have a differential effect on the three fescue species mainly in the seedling establishment, not in the germination phase. For the successful establishment of F. rubra and F. pratensis, the coincidence of high rainfall and local disturbance, removing bryophytes, is required. The presence or absence of bryophytes had no effect on establishment in dry years, while in rainy years the removal of bryophytes has a clear positive effect.

show abstract

“…The finding confirms that of Debez et al (2004) for another Tunisian ecotype of the same species. Actually, several studies have shown that halophytes are salt-sensitive at the earliest establishment stage; however, they acquire halophytic features during autotrophic stage of development (Katembe et al 1998;Noe and Zedler 2000;Ungar 1996).…”

Section: Discussionmentioning

confidence: 99%

Salt tolerance of the annual halophyte Cakile maritima as affected by the provenance and the developmental stage

et al. 2007

View full text Add to dashboard Cite

Though halophytes are naturally adapted to salinity, their salt-tolerance limits are greatly influenced by their provenance and developmental stage. In the present study, physio-biochemical responses of two Tunisian ecotypes of the oilseed coastal halophyte Cakile maritima (Brassicaceae) to salinity (0-400 mM NaCl) were monitored during germination and vegetative growth stages. Tabarka and Jerba seeds were collected from humid or arid climatic areas, respectively. Plant response to salinity appeared to depend on the ecotype and salinity levels. Increasing salinity inhibited germination process. Jerba seeds were found to be more salt tolerant than the Tabarka ones. At the autotrophic stage of growth and under salt-free conditions, Jerba was less productive than Tabarka (in terms of dry matter accumulation), but plant biomass production and leaf expansion (area and number) of the former ecotype were progressively improved by 100 mM NaCl, as compared to the control. In contrast, at the same salt concentration, these parameters decreased under increasing salinity in Tabarka (salt sensitive). Leaf chlorophyll content was reduced at severe salinity, but this effect was more conspicuous in the sensitive Tabarka plants. Na + contents in the Jerba and Tabarka leaves collected from the 400 mM NaCl-treated plants were 17-and 12-fold higher than in the respective controls. This effect was accompanied by a significant reduction in the leaf K + , Mg 2+ and Ca 2+ contents, especially in the salt-treated Tabarka. A significant accumulation of proline and soluble carbohydrates in leaves was found during the period of intensive leaf growth. These organic compounds likely play a role in leaf osmotic adjustment and in protection of membrane stability at severe salinity.

show abstract

Differential effects of four abiotic factors on the germination of salt marsh annuals

Cited by 114 publications

References 30 publications

Effects of NaCl stress on seed germination, leaf gas exchange and seedling growth of Pteroceltis tatarinowii

Effects of NaCl stress on seed germination, leaf gas exchange and seedling growth of Pteroceltis tatarinowii

Moisture conditions and the presence of bryophytes determine fescue species abundance in a dry calcareous grassland

Salt tolerance of the annual halophyte Cakile maritima as affected by the provenance and the developmental stage

Contact Info

Product

Resources

About