Role of chemicals in alleviating salinity and light related seed dormancy in sub-tropical grasses

Khan, M. Ajmal; Shaikh, Faiza; Zehra, Afsheen; Ahmed, Muhammad Zaheer; Gul, Bilquees; Ansari, Raziuddin

doi:10.1016/j.flora.2017.06.001

Cited by 6 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several methods are used to reduce or overcome seed dormancy, and these can vary among species (Steadman et al 2003;Nee et al 2017). Priming seeds in an appropriate osmoticum improves germination and seedling emergence of several plant species (Tiryaki and Keles 2012), and a positive photoblastism, light-inducible seed germination, was recently reported for Eragrostis ciliaris (Khan et al 2017). Although existence of slight embryo dormancy was previously mentioned in fresh seeds of Eragrostis abyssinica [synonym of E. tef (Zuccagni) Trotter] (Katayama and Nakagama 1972;van Delden 2011), this study has demonstrated that E. tef has light-inducible seed germination and half of freshly harvested seed can be dormant.…”

Section: Discussionmentioning

confidence: 97%

“…The market value of Teff seed is determined mainly by seed color, which varies from white to dark brown (Ketema 1993). An often temporary state of physiological seed dormancy means many cereal seeds either do not germinate or have low germination percentage (Khan et al 2017), which prevents a successful start to the season and uniform stand establishment in several important plant species including Lolium rigidum (Steadman et al 2003), Elymus elymoides (Meyer et al 2000) and Bromus tectorum (Bauer et al 1998). Some research into Teff seed has been conducted including hydrothermal time modelling (van Delden 2011), plus grain structure and properties of caryopses of Teff seeds (Kreitschitz et al 2009).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Enhanced germination performance of dormant seeds of <i>Eragrostis tef</i> in the presence of light

Tiryaki

Kaplan

2019

Trop. grassl.-Forrajes trop.

View full text Add to dashboard Cite

Lack of germination or low germination due to seed dormancy prevents successful crop establishment in several important plants. To determine the presence of innate seed dormancy and effects of stress-related plant hormones on germination performance of Teff (Eragrostis tef) seeds, we primed seeds in 1% KNO3 for 24 hours in dark conditions at 21 ± 0.5 ºC along with varying concentrations of chemicals known to influence seed germination, including: acetyl salicylic acid (ASA); methyl jasmonate (JA-Me); giberellic acid (GA3); and indole acetic acid (IAA). Primed seeds were incubated either in constant light (210 µM/m2/s) or in darkness at 21 ± 0.5 ºC. The results indicated that primingsignificantly improved final germination percentage (FGP) in both light (92.5%) and dark (89.4%) conditions compared with untreated seeds. The inclusion of plant hormones in the priming media generally had limited effects, except for 10 mM ASA (94.5%) and 100 mM GA3 (92.5%). ASA generally provided faster seed germination than seeds primed in 1% KNO3 only, while the other plant hormones had no effect on the time required for 50% of FGP in the dark. Priming had no significant effect on time span of germination in either light or dark incubation conditions. The results demonstrate that E. tef has light-inducible seed germination and about half of freshly harvested seeds can be dormant, which can be eliminated to some extent by priming seeds in 1% KNO3.

show abstract

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Enhanced germination performance of dormant seeds of <i>Eragrostis tef</i> in the presence of light

Tiryaki

Kaplan

2019

Trop. grassl.-Forrajes trop.

View full text Add to dashboard Cite

show abstract

“…Dormancy regulating compounds such as phytohormones (e.g., gibberellic acid, abscisic acid, kinetin and ethylene) and nitrogenous compounds (e.g., thiourea and nitrate) have been reported to regulate germination and break the innate dormancy of several species of dry subtropical deserts [21,22,23]. For example, some studies indicated the presence of several phytohormones in dead structures enclosing the embryo with the capacity to regulate seed germination and seedling growth.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the exogenous application of nitrate and thiourea alleviated innate dormancy in seeds of several grasses including Sporobolus arabicus [24], Lasiurus scindicus [25], Centropodia forsskalii and Sporobolus spicatus [21], as well as Aristida adscensionis , Eragrostis ciliaris and Tragus racemosus [26]. Other studies [23,27] reported that nitrogenous compounds could terminate seed dormancy by enhancing levels of cytokinin and reducing levels of ABA, which is associated with enhancing innate dormancy. In addition, nitrate can act as a hormone that regulates the germination process through phytochrome [28].…”

Section: Introductionmentioning

confidence: 99%

Roles of Hardened Husks and Membranes Surrounding Brachypodium hybridum Grains on Germination and Seedling Growth

El‐Keblawy

Elgabra

Mosa

et al. 2019

Plants

View full text Add to dashboard Cite

Several studies have assessed the function and significance of the presence of dead, hardened husks on germination and seedling growth in several grass species and reached to inconsistent results. Here, we assess the roles of husks (dead lemma and palea) and an inner membrane surrounding the grains on germination behaviour and seedling growth of Brachypodium hybridum, one of three species of the genetic model B. distachyon complex, in an arid mountain of Arabia. The interactive effects between temperature and the incubation light were assessed on germination of husked and dehusked-demembraned grains. Germination and seedling growth were assessed for different combinations of grain treatments (soaked and non-soaked husked, dehusked-membraned and dehusked-demembraned). Dehusked-demembraned grains were also germinated in different dormancy regulating compounds (DRCs) and light qualities (light, dark and different red: far red [R: FR] ratios). The results indicated an insignificant difference between husked and dehusked-membraned grains on final germination and the germination rate index (GRI), with the former producing significantly bigger seedlings. Removal of the inner-membrane resulted in a significant reduction in all traits. Soaking grains in water resulted in significant enhancements in germination and seedling growth of only husked grains. Husked-membraned and demembraned grains germinated more significantly and faster at lower rather than higher temperatures. None of different concentrations of several DRCs succeeded in enhancing final germination of dehusked-demembraned grains. Red-rich light significantly enhanced germination of dehusked-membraned grains in comparison to other light qualities. It could be concluded that the role of husks is to mainly enhance seedling growth, while the major role of the membrane is to increase final germination. The ability of red-rich light in enhancing the germination of dehusked-membraned but not dehusked-demembraned grains suggest a role for the inner membrane in regulating dormancy through differential filtering of light properties.

show abstract

Comparative Seed Germination Ecology of Sabkha and Playa Halophytes of Pakistan

Rasheed

Ahmed

Gul

et al. 2019

Tasks for Vegetation Science

View full text Add to dashboard Cite

Role of chemicals in alleviating salinity and light related seed dormancy in sub-tropical grasses

Cited by 6 publications

References 29 publications

Enhanced germination performance of dormant seeds of <i>Eragrostis tef</i> in the presence of light

Enhanced germination performance of dormant seeds of <i>Eragrostis tef</i> in the presence of light

Roles of Hardened Husks and Membranes Surrounding Brachypodium hybridum Grains on Germination and Seedling Growth

Comparative Seed Germination Ecology of Sabkha and Playa Halophytes of Pakistan

Contact Info

Product

Resources

About