Effects of salinity on seed germination, seedling growth and survival of Spartina ciliata Brong

Abstract

-(Effects of salinity on seed germination, seedling growth and survival of Spanina ciliata Brong.) The effects of different salinities on the germination of Spartina ciliata seeds were tested during 40 days in the laboratory, using six concentrations of NaCI (0,45, 80, 130, 170 and 215 mM) besides three concentrations of seawater (25, 30 and 35%0). In addition, the survival and growth of seedlings were tested in five constant salinity regimes (O, 45, 80 and 170 mM NaCI) as well as in five regimes of simulating seawater overwash. The results showed that seeds possed a high germination capacity over a wide range of salinities (O to 215 mM NaC\). Although concentrations close to full-strength seawater completely inhibited seed germination, the transfer of the ungerminated seeds to freshwater immediately stimulated this. The effects of salinity on seedling growth showed that shoot height and root length were the variables most sensitive to salt stress. Frequent overwash with seawater significantly reduced the survival and growth of Spartina ciliata seedlings. The success in seed germination, survival, and growth of Spartina ciliata in salinities above those normally found in the natural environment could explain the species being distributed throughout salt-stressed foredune habitats in southern Brazil.Key words -salinity stress, seed germination, seedling growth, coastal dune plant, Spartina ciliata

Differential Effects of Increasing Salinity on Germination and Seedling Growth of Native and Exotic Invasive Cordgrasses

“…Germination of Spartina ciliata Brongn. from Brazil was reduced at salinities higher than 0.20 M NaCl, totally inhibited at seawater concentration, and speed of germination increased after salinity exposure [36]. In addition, exposure to salinity followed by recovery after freshening accelerated germination for S. maritima and S. densiflora in our study, which has been reported previously for other halophyte species from a range of functional groups [8,37,38,39].…”

“…Invasive S. densiflora germination showed higher salinity tolerance than native S. maritima , but the autochthonous species showed higher salinity tolerance in relation to early seedling growth. Negative effects of salinity on seedling growth have been reported previously for invasive S. densiflora in Humboldt Bay (California) where seedling height decreased at salinities higher than 0.20 M NaCl [30], for invasive S. alterniflora in China [35], where shoot height decreased from 0.20 M NaCl up and radicle length from 0.10 M NaCl up, and for native S. ciliata in Brazil [36], with shoot and radicle being smaller at salinities higher than from 0.05 M NaCl.…”

Efeito do estresse salino sobre a concentração de pigmentos e prolina em folhas de arroz

“…Além disso, a salinidade afeta as plantas pela redução da taxa de absorção de água (WASHINGTON, 1980). A maioria das halófitas tem desenvolvido adaptações, como suculência, ajustamento osmótico, glândulas de sal e compartimentação iônica para diluir ou contrabalançar os efeitos da salinidade (MARSCHNER, 1995;CORDAZZO, 1999;LARCHER, 2000).…”

Quality Seed: An Innovative Sorting Technique to Sustainable, Uniform and Effective Seedling Establishment in Nursery for System of Rice Intensification

“…Therefore, this decrease was attributed due to the presence of high salt absorbed by the seed as reported by Turhan et al (2011) on Spinach cultivars, Akbarimoghaddam et al (2011) on wheat, Bojović et al (2010) on Brassicaceae and Solanaceae seeds and found that seeds of all species germinate only at low NaCl concentration. Other research findings on the effect of salt to seedling growth were reported (Cordazzo, 1999;Kaymakanova, 2009;Kiani et al, 2011;Mohammad et al, 2011;Mostafavi, 2012;Schneider and Bouali, 2010;Sivasankaramoorthy et al, 2010) who studied on different seeds and drawn similar conclusion on the decrease in germination as NaCl increased. This can therefore be concluded that increase in salt concentration is not an indicator to quality seed selection rather it only makes farmers to employ more seeds with low potential germination output.…”