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Research ArticleThe aim of this study was to optimize nursery production of Retama sphaerocarpa(Fabaceae), an important shrub species characterized by a seed coatdormancy hindering germination, and used in the restoration of degraded aridand semi-arid areas. To assess the influence of scarification agents and motherplant effect on germination rate and seedling vigor, a germination test withfresh seed was performed in a germination chamber using a factorial designwith two fixed factors (mother plant effect and scarification agent). Freshseeds were scarified by sulphuric acid (96% concentration, 60 min) and hot water(80 °C, 30 sec) and their germination compared with untreated controlseeds. Scarification of seeds using sulphuric acid has proven the best methodto enhance germination of this species, achieving the highest germination rate(>79%) and the best vigor index. Differences between seed lots from differentmother plants were statistically significant and could influence seed germinationsuccess. We suggest that effectiveness of hot water scarification methodmay be improved by additional time of seed immersion. Owing to its potentialfor use in land restoration, bioenergy production and ornamental purposes, incrementof commercial demand of this species is expected in the near futureinfo:eu-repo/semantics/publishedVersio

Influence of mother plant and scarification agents on seed germination rate and vigor in Retama sphaerocarpa L. (Boissier)