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Annals of Botany 80: 795-801, 1997
© 1997 Annals of Botany Company

Rate of Change in Dormancy Level and Light Requirement in Weed Seeds During Stratification

ANGELA NORONHA, LARS ANDERSSON and PER MILBERG

Department of Crop Production Science, Swedish University of Agricultural Sciences, Box 7043, S-750 07, Uppsala, Sweden

March 5, 1997 ; May 15, 1997 . August 25, 1997 .

The rate of change in dormancy level and light requirement, induced during stratification at 3.2 °C, was investigated in seeds ofStellaria media, Cerastium fontanum, Veronica agrestisandTaraxacum officinale.Two stratification environments, soil and wet filter paper in petri-dishes, were used. On nine occasions during a 6 week stratification period, germination was tested under three light conditions at 3.5/18.5 °C: (1) darkness; (2) light; and (3) short-term light exposure followed by darkness. Prior to stratification, germination in all species was >=89% in light and >=53% in darkness. Within 2 weeks of stratification, germinability inV. agrestisandS. mediaseeds decreased in all treatments. InC. fontanumandT. officinaleseeds, germinability also decreased after 2 weeks but only in the dark treatment, indicating induction of a light requirement. After two more weeks of stratification, the induced dormancy inS. mediaseeds stratified in soil became weaker and the light requirement inT. officinaleseeds was lost. Differences between the two stratification environments and/or interactions between light conditions, stratification environments and time were found for all species. These results suggest that: (1) the dormancy level and the light requirement of seeds may change dramatically over relatively short-time periods during stratification; and (2) germinability depends on the stratification environment experienced by the seeds. Predicting the dormancy level or light requirement in a seed batch is difficult and requires a thorough knowledge of the effect of the stratification conditions used.Copyright 1997 Annals of Botany Company

Burial; Cerastium fontanumBaumg.; chickweed; cold stratification; common mouse-ear; dandelion; dormancy; light requirement; seed; Stellaria media(L.) Vill.; speedwell; Taraxacum officinalegroup; Veronica agrestisL.; weed


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