Light, salinity, and temperature effects on the seed germination of perennial grasses

Khan, M. Iqbal; Gulzar, Salman

doi:10.3732/ajb.90.1.131

Cited by 92 publications

(82 citation statements)

References 13 publications

(16 reference statements)

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“…In contrast, the germination responses of cultivated and wild wheat seeds were similar in light and darkness with an increase in the temperature. Similar results were reported by Khan and Gulzar (2003) for many halophytic perennial grasses.…”

Section: Discussionsupporting

confidence: 78%

Comparison of germination responses of cultivated wheat ( Triticum ) and its wild relative ( Aegilops ) species under salinity, temperature and light

Yıldız

Kasap

2007

Acta Agronomica Hungarica

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The seed germination of bread (Triticum aestivum cv. Bezostaya 1 and Ceyhan 99) and durum (Triticum durum cv. Diyarbakır 81 and Fırat 93) wheat species and their wild relative species (Aegilops biuncialis and Ae. triuncialis) was compared at two light levels, nine NaCl concentrations and three alternating temperature regimes. No seeds germinated at 675 mmol/L NaCl. The highest seed germination (100%) of cultivated wheat cultivars was noted in the control at 15/25°C and 20/30°C, and that of wild wheat species in both the control and the 150 mmol/L NaCl treatment under all temperature regimes. The seed germination of bread and durum wheat cultivars was completely inhibited at or above 450 and 375 mmol/L NaCl, respectively. No Ae. biuncialis seeds germinated at 600 mmol/L NaCl, while seeds of Ae. triuncialis germinated at this concentration (38.9%) only at 20/30°C in darkness. The inhibitory effect of light on germination in all genotypes was determined in some salinity levels at 15/25°C. The optimal germination treatment for all genotypes was 15/25°C temperature regime and darkness. The inhibitory effect of high salinity on germination was greater at 25/35°C than at 15/25°C or 20/30°C. In salinity and temperature interactions, the seeds of wild wheat species were found to be more tolerant than those of wheat cultivars.

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Section: Discussionsupporting

confidence: 78%

Comparison of germination responses of cultivated wheat ( Triticum ) and its wild relative ( Aegilops ) species under salinity, temperature and light

Yıldız

Kasap

2007

Acta Agronomica Hungarica

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“…light, moisture, temperature, soil quality) in determining the success of seed germination and plant recruitment among habitats (Pearson et al 2003;Khan & Gulzar 2003;Yanlong et al 2007;Fagundes et al 2011). Small seeds generally germinate better in light than in darkness, while large seeds do not exhibit a difference in germination between these two conditions (Milberg et al 2000;Fenner & Thompson 2005).…”

Section: Intraspecific Variation In Seed Size and Light Intensity Affmentioning

confidence: 99%

Intraspecific variation in seed size and light intensity affect seed germination and initial seedling growth of a tropical shrub

et al. 2017

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Seed germination and seedling performance are aff ected by environmental factors and seed traits. In this study we investigated the eff ects of seed size and light intensity on germinability and seedling development of Copaifera oblongifolia. A total of 225 seeds were individually weighed and sown in three germination trays composed of 75 cells each. Each tray was placed in a diff erent germination chamber with controlled photoperiod, temperature and light intensity. Seed size showed a positive relationship with time required for seed germination, and seeds exposed to high light intensity required more time to germinate. Seed size did not aff ect germination percentage, but seeds sown under high light intensity had a lower germination percentage than seeds sown under low light intensity and darkness. Seedling shoot mass showed a positive relationship with seeds mass, and seedlings grown in high light intensity had greater shoot mass than seedling growth in low light intensity and darkness. Th us, seed germinability of C. oblongifolia was higher in darkness while seedlings exhibited greater development under light. Looking to explain the ability of C. oblongifolia to colonize open/disturbed sites, it seems possible that plowing soil can bury seeds, thereby stimulating the germination of seeds present in the seed bank.

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“…It has been shown in a large number of species that an increase in salt concentration usually delays and reduces seed germination (El-Keblawy & Al-Shamsi, 2008;Guma, Padrón-Mederos, Santos-Guerra, & Reyes-Betancort, 2010). However, there is a wide range of variability in salt tolerance among species (Khan & Gulzar, 2003). Moreover, many seeds that are unable to germinate at high saline concentrations might recover the ability to germinate when salinity levels decrease (Zia & Khan, 2008).…”

mentioning

confidence: 99%

Seed dormancy of Ochradenus baccatus (Resedaceae), a shrubby species from Arabian desert regions

Bhatt¹,

Pérez-García

2016

RBT

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Abstract:Ochradenus baccatus is a perennial glycophyte growing in Middle East and it is one of the most important food sources for many animal species in desert regions. The aim of our study was to investigate the effects of seed storage, light, temperature and gibberellic acid (GA 3 ) on germination of O. baccatus seeds. We also investigated the germination characteristics of O. baccatus seeds under different saline concentration and their capability to recover germination once they were transferred to distilled water. Seeds were stored at room temperature (20 ± 2 ºC) and at -18 ºC. Germination tests were conducted at alternating temperatures of 15/25, 20/30 and 25/35 ºC in either continuous darkness or photoperiod of 12-h dark/12-h light. To study the effect of GA 3 on germination of O. baccatus seeds, freshly-collected seeds and stored seeds were soaked for 24 h in a GA 3 water solution (1 g/L) before sowing. To assess the salinity tolerance during germination, seeds were germinated under different salinity levels (100, 200 and 400 mM NaCl). Stored seeds at room temperature and -18 ºC germinate equally well at different temperature regimes and light conditions. However, freshly matured seeds were not able to germinate even when they were treated with GA 3 . On the contrary, stored seeds at room temperature and -18 ºC treated with GA 3 increase the final germination percentages. These results indicated that O. baccatus seeds have physiological dormancy and they need to be stored in order to break their dormancy. In the present study, one year of storage did not show a significant variation in germination between the two storage conditions assayed. Therefore, further research is needed to know about the maximum storage period for O. baccatus seeds under different storage conditions. Very few O. baccatus seeds (less than 5 %) germinated at the tested lowest concentration of NaCl. However, ungerminated seeds were able to germinate when salinity stress was alleviated. In conclusion, O. baccatus seeds have physiological dormancy, and seed storage (at room temperature and at -18 ºC) for one year is effective for breaking this dormancy. In addition, O. baccatus seeds present ability to remain viable in saline conditions and they will be able to germinate once the salinity level decrease. Rev. Biol. Trop. 64 (3): 965-974. Epub 2016 September 01.Key words: seed storage, seed germination, temperature, salinity, desert species, physiological dormancy.Ochradenus baccatus Delile (Resedaceae) is a perennial shrub that grows on sandy and stony habitats in Middle East (Al-Fredan, 2010). The fleshy fruits of O. baccatus contain high water and sugar content, are consumed and dispersed by various frugivores, and is reported to be one of the most important food sources for many animal species in the Arabian desert (Bronstein et al., 2007;. The green stems of O. baccatus helps leaves in conducting photosynthesis, especially when leaves are weakened after severe drought environment (Abdulfatah, 2004). This species is widely distrib...

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Light, salinity, and temperature effects on the seed germination of perennial grasses

Cited by 92 publications

References 13 publications

Comparison of germination responses of cultivated wheat ( Triticum ) and its wild relative ( Aegilops ) species under salinity, temperature and light

Comparison of germination responses of cultivated wheat ( Triticum ) and its wild relative ( Aegilops ) species under salinity, temperature and light

Intraspecific variation in seed size and light intensity affect seed germination and initial seedling growth of a tropical shrub

Seed dormancy of Ochradenus baccatus (Resedaceae), a shrubby species from Arabian desert regions

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