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Physiological dormancy and germination requirements of seeds of several North American Rhus species (Anacardiaceae)

Published online by Cambridge University Press:  22 February 2007

Xiaojie Li ,
Jerry M. Baskin  and
Carol C. Baskin
Xiaojie Li
Affiliation:
School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506–0225, USA
Jerry M. Baskin*
Affiliation:
School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506–0225, USA
Carol C. Baskin
Affiliation:
School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506–0225, USA Department of Agronomy, University of Kentucky, Lexington, Kentucky 40546–0091, USA
*
*Correspondence Fax: 606–257–1717 Email: jmbask0@ukcc.uky.edu
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Abstract

Fourteen seedlots of five species of Rhus were surveyed for presence/absence of physiological dormancy and/or for germination requirements of non-dormant seeds. Physiological dormancy was present in the four seedlots of R. aromatica studied, but not in either of the two seedlots of its close relative R. trilobata, which is in contrast to previous reports. Neither were seeds of R. glabra, R. typhina, nor R. virens physiologically dormant. Stratification at 5oC for 1 week or incubation in 500 or 1000 mg/l solutions of gibberellic acid broke physiological dormancy in > 90% of the R. aromaticaseeds. Maturation desiccation acted as a switch from a developmental to a germinative mode in R. aromatica embryos, whereas it was not required for germination of R. glabra or R. virens (R. trilobata and R. typhinanot tested). Seeds of all five species incubated on a moist substrate became fully imbibed in 2 d, at which time moisture content was approx. 70–80%of their initial weight. In general, germination of non-dormant seeds was rather insensitive to temperature and light. Seeds germinated equally well in light and in darkness over a daily (12 h/12 h) temperature range of 15/6–35/20oC. Over a 4 week period, the best germination percentages were obtained at 25/15 and 20/10oC, whereas 35/20oC appeared to be supraoptimal, though not always significantly so. If the incubation period was extended to 30 weeks, germination percentages were as high at 15/6oC as at 25/15 and 20/10oC.

Keywords

light and seed germinationimbibitionphysiological seed dormancyRhusspptemperature and seed germination
Type
Research Article
Information
Seed Science Research , Volume 9 , Issue 3 , March 1999 , pp. 237 - 245
Copyright
Copyright © Cambridge University Press 1999

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