Role of temperature in regulating the timing of germination in Portulaca oleracea

J. M. Baskin, C. C. Baskin

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17 Scopus citations


The peak of germination of autumn-sown seeds of Portulaca oleracea was between 21 May and 21 June, when mean daily maximum and minimum temperatures were 30.7 and 17.4oC, respectively. Fresh seeds collected in October germinated to 13 and 94% at 30:15 and 35:20oC thermoperiods, respectively, in light, and to 0% in darkness. Seeds were buried in October 1975 and exhumed in December 1975 through September 1976. In light, exhumed seeds germinated to 69-100% at 30:15 and 35:20oC, to 1-80% at 20:10oC, and to 0-52% at 15:6oC; in darkness they germinated to 5-55% at 30:15 and 35:20oC and to 0% at 20:10 and 15:6oC. Germination at 20:10oC did not exceed 50% until mid-April, and it did not exceed 50% at 15:6oC until June. The minimum temperature at which ≥50% of fresh seeds germinated in light decreased with an increase in afterripening temperature. The high temperature requirement for complete afterripening and for germination of partially afterripened seeds prevents germination of this summer annual in temperate regions until late spring and early summer. -from Authors

Original languageEnglish
Pages (from-to)563-567
Number of pages5
JournalCanadian Journal of Botany
Issue number3
StatePublished - 1988

ASJC Scopus subject areas

  • Plant Science


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