Germination of Spotted Spurge (Chamaesyce maculata) Seeds in Response to Different Environmental Factors

摘要: Abstract Spotted spurge, a C4 species, is summer annual weed, introduced to the Golestan province of Iran in 2006. A series laboratory experiments were conducted at Faculty Agriculture, Ferdowsi University Mashhad, Iran, evaluate influence environmental factors on seed germination spotted spurge. Seeds germinated over constant temperature range 25 45 C with 14-h photoperiod and 30 50 continuous darkness. alternating day/night regimes 25/15 45/35 C, maximum (> 80%) temperatures 35/25, 40/30, 45/35C. Germination increased from 23.5 98% as water potential −0.6 0 MPa (control). was > 85% sodium chloride (NaCl) concentrations up 80 mM, no 160 mM NaCl. not affected by pH, it > more than 95% pH ranging 4 9. The seeds submerged for period less 3 wk > 60...