TY - JOUR
T1 - Role of temperature in regulating the timing of germination in Portulaca oleracea
AU - Baskin, J. M.
AU - Baskin, C. C.
PY - 1988
Y1 - 1988
N2 - 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
AB - 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
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U2 - 10.1139/b88-081
DO - 10.1139/b88-081
M3 - Article
AN - SCOPUS:0024225472
SN - 0008-4026
VL - 66
SP - 563
EP - 567
JO - Canadian Journal of Botany
JF - Canadian Journal of Botany
IS - 3
ER -