Seed enhancing treatments: comparative analysis of germination characteristics of 23 key herbaceous species used in European restoration programmes

Abstract

The response of seeds from 23 wild plant species to a range of seed enhancing treatments was studied. We tested the hypothesis that sensitivity of the 23 species to these compounds is related to their ecological niche. The three ecological niches considered were open land, open-pioneer and woodland. Hence, the germination of a species is likely adapted to different light conditions and other environmental signals related to the niche.• As representatives of environmental signals, the effects of smoke-related compounds (karrikinolide, KAR 1 ), nitrate and plant growth regulator (gibberellic acid, GA 3 ) on germination were studied. Seeds were exposed to these additives in the imbibition medium; all described as germination cues. We also investigated the effect of light regimes and additives on germination parameters, which included final germination, germination rate and uniformity of germination. Seeds were placed to germinate under three light conditions: constant red light, constant darkness and 12 h white light photoperiod.• We observed inhibition by KAR under light in some species, which may have ecological implications. The results showed that no single treatment increased the germination of all the tested species, rather a wide variation of responsiveness of the different species to the three compounds was found. Additionally, no interaction was found between responsiveness to compounds and ecological niche. However, species in the same ecological niche and dormancy class showed a similar responsiveness to light.• Species that share a similar environment have similar light requirements for germination, while differences exist among species in their responsiveness to other germination cues.

Alpine Pioneer Plants in Soil Bioengineering for Slope Stabilization and Restoration: Results of a Preliminary Analysis of Seed Germination and Future Perspectives

“…While the seeds of some did not germinate (or very few germinated) with no treatment, others had different responses (as regards GRP and GSP) to the various treatments. This is in agreement with [51] who, after analysing 23 key herbaceous species for use in European habitat restoration, found that differences exist among species in their responsiveness to various germination cues.…”

Generative production and evaluation of ornamental plant potential of an endemic flax species for ecological landscape applications

“…Our results confirm the information that cold–wet stratification (Russell, 2011) and GA 3 treatments (Del Egido et al, 2019; Kildisheva et al, 2019) are effective in dormant seeds without water penetration problems. Kırmızı et al (2018) and Yucel (2022) reported results parallel to our study.…”

Maximising the use of native seeds in restoration projects

“…Finally, across a wide spectrum of 23 key herbaceous species for use in European habitat restoration, Lopez del Egido et al . () found that species that share a similar environment have similar light requirements for germination, while differences exist among species in their responsiveness to other germination cues. Consequently, enhancing germination may demand a species‐by‐species approach.…”