A graphical method for identifying the six types of non-deep physiological dormancy in seeds

E. Soltani, C. C. Baskin, J. M. Baskin

Research output: Contribution to journalReview articlepeer-review

40 Scopus citations


We present a new seed dormancy classification scheme for the non-deep level of the class physiological dormancy (PD), which contains six types. Non-deep PD is divided into two sublevels: one for seeds that exhibit a dormancy continuum (types 1, 2 and 3) and the other for those that do not exhibit a dormancy continuum (types 4, 5 and 6). Analysis of previous studies showed that different types of non-deep PD also can be identified using a graphical method. Seeds with a dormancy (D) ↔ conditional dormancy (CD) ↔ non-dormancy (ND) cycle have a low germination percentage in the early stages of CD, and during dormancy loss the germination capacity increases. However, seeds with a CD/ND (i.e. D→CD↔ND) cycle germinate to a high percentage at a narrow range of temperatures in the early stages of CD. Cardinal temperatures for seeds with either a D/ND or a CD/ND cycle change during dormancy loss: the ceiling temperature increases in seeds with Type 1, the base temperature decreases in seeds with Type 2 and the base and ceiling temperatures decrease and increase, respectively, in seeds with Type 3. Criteria for distinguishing the six types of non-deep PD and models of the temperature functions of seeds with types 1, 2 and 3 with both types of dormancy cycles are presented. The relevancy of our results to modelling the timing of weed seedling emergence is briefly discussed.

Original languageEnglish
Pages (from-to)673-682
Number of pages10
JournalPlant Biology
Issue number5
StatePublished - Sep 2017

Bibliographical note

Publisher Copyright:
© 2017 German Botanical Society and The Royal Botanical Society of the Netherlands


  • Cardinal temperatures
  • conditional dormancy
  • dormancy cycle
  • dormancy loss
  • germination

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science


Dive into the research topics of 'A graphical method for identifying the six types of non-deep physiological dormancy in seeds'. Together they form a unique fingerprint.

Cite this