Iranian Biology Society Journal of Plant Research (Iranian Journal of Biology) 2383-2592 26 2 2013 08 23 Effect of chemical treatments, pre-moist chilling, hot and tap water on seed dormancy breaking in Arctium lappa Effect of chemical treatments, pre-moist chilling, hot and tap water on seed dormancy breaking in Arctium lappa 217 225 184 2627 FA Journal Article 2009 12 16 <em>Arctium lappa</em> is a medicinal plant of Asteraceae. To break dormancy and increase the germination of its seeds, various methods was tested including KNO₃ (0.2% for 48 h.), H₂SO₄ (75% for 5 and 10 min.), hot water (70 and 90 °C, each for 15 min.), and tap water (for 24 and 48 h.). Results revealed that the treatment with KNO₃ was more effective, yielding 85% germination. On the other hand, treatments with H₂SO₄, hot (70°C) and tap water also exhibited considerable effects on the germination rate and percentage (in turn- 66%, 65% and 24%). Overall, according to the obtained results and with regard to the negative effect of H₂SO₄ on the consequential growth of seedlings, KNO₃(0.2% for 48 h.) and hot water (70°C) would be suggested as the most efficient treatments to break seed dormancy of <em>Arctium lappa</em>. <em>Arctium lappa</em> is a medicinal plant of Asteraceae. To break dormancy and increase the germination of its seeds, various methods was tested including KNO₃ (0.2% for 48 h.), H₂SO₄ (75% for 5 and 10 min.), hot water (70 and 90 °C, each for 15 min.), and tap water (for 24 and 48 h.). Results revealed that the treatment with KNO₃ was more effective, yielding 85% germination. On the other hand, treatments with H₂SO₄, hot (70°C) and tap water also exhibited considerable effects on the germination rate and percentage (in turn- 66%, 65% and 24%). Overall, according to the obtained results and with regard to the negative effect of H₂SO₄ on the consequential growth of seedlings, KNO₃(0.2% for 48 h.) and hot water (70°C) would be suggested as the most efficient treatments to break seed dormancy of <em>Arctium lappa</em>. https://plant.ijbio.ir/article_184_6cdd60ea0045eb7a6ec44c54d29ed402.pdf