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A meta-analysis of the effects of treatments used to break dormancy in seeds of the megagenus Astragalus (Fabaceae)

Published online by Cambridge University Press:  04 November 2020

Elias Soltani Open the ORCID record for Elias Soltani [Opens in a new window] ,
Jerry M. Baskin ,
Carol C. Baskin  and
Fatemeh Benakashani
Elias Soltani*
Affiliation:
Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Tehran, Iran
Jerry M. Baskin
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY40506-0225, USA
Carol C. Baskin
Affiliation:
Department of Biology, University of Kentucky, Lexington, KY40506-0225, USA Department of Plant and Soil Sciences, University of Kentucky, Lexington, KY40546-0312, USA
Fatemeh Benakashani
Affiliation:
Department of Agronomy and Plant Breeding Sciences, College of Aburaihan, University of Tehran, Tehran, Iran
*
Author for Correspondence: Elias Soltani, E-mail: elias.soltani@ut.ac.ir
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Abstract

Astragalus is the largest genus of seed plants with 3000 or more species that occurs naturally on several continents. The genus has some use as a forage and medicine and in industry, and many of the species are rare endemics threatened with extinction. The seeds are reported to be dormant at maturity, and various treatments have been used in an attempt to germinate them. Our primary aim was to determine via a meta-analysis the most effective way(s) to break dormancy in seeds of this species-rich genus. Mechanical and chemical (conc. sulphuric acid) scarification were by far the best of 12 treatments for breaking seed dormancy of the 40 species included in our meta-analysis, whereas prechilling, gibberellin and smoke were ineffective. These results along with those of imbibition tests confirm that seeds of the examined Astragalus species have physical dormancy (PY). Further, PY in these 40 species and (its documented occurrence) in 118 species that could not be included in our meta-analysis transcends climatic and geographic boundaries, edaphic conditions, life cycle/life form types and infrageneric phylogeny. Thus, it seems likely that most species of Astragalus have PY. However, in addition to PY, physiological dormancy (PD), that is, combinational dormancy (PY + PD), has been reported in a few species of Astragalus. This study should be useful to both basic and applied scientists who want to germinate seeds of Astragalus.

Keywords

chemical scarificationcombinational dormancydormancy-breaking treatmentsimpermeable seed coatmechanical scarificationphysical dormancy
Type
Research Paper
Information
Seed Science Research , Volume 30 , Issue 3 , September 2020 , pp. 224 - 233
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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