Changes inSenna obstuifoliaGermination Requirements over 12 Months under Field Conditions

[摘要] Senna obtusifoliaseeds were collected in Fall 2003 and immediately field sown to assess dormancy alleviation and effect of after-ripening over a 12-month period on light and temperature requirements for germination. Seeds did not exhibit physical dormancy at maturation and readily germinated over a broad range of light and thermal conditions. Dormancy gradually increased during Winter months, resulting in only a small fraction of the population capable of germination by early Spring. Dormancy break did not occur at a specific time of the year nor did dormancy alleviation increase over the 12-month period following maturation. Conditions during Spring and Summer coincided with thermal requirements for germination of the nondormant fraction of the population.Senna obtusifoliaseeds were nonresponsive to red and far-red lights, and seeds did not acquire a light requirement following burial for 6 months.

[学科分类] 农艺学与作物科学