Pre-Sowing Treatments Improve Germinability of South Texas Native Plant Seeds

Abstract

The incorporation of native plant species is central to restoration efforts, but this is often limited by both the availability of seeds and the relatively low viability and germination rates of commercially available seeds. Although pre-sowing treatments are commonly used to improve germination rates of seeds, the efficacy of these treatments is found to vary across species. In this study, we tested how four pre-sow treatments (physical scarification, acid scarification, cold stratification, and aerated hydropriming) affected the viability and seed germination rates of 12 commercially available plant species native to south Texas and commonly used in restoration efforts. Our results show that the viability of the seeds have a wide range, from 78% to 1.25%. Similarly, the total germination rate ranged from 62% to 0%. We found that pre-sowing treatments accelerated the germination rate in 9 of 12 plant species tested, but the effect varied by treatment. Collectively, our results identify various methods to achieve the best germination rates for native plants of south Texas, to help improve restoration efforts across the region.

Dormancy-breaking treatments for enhancing seed germination in plant Kitaibela vitifolia Willd.

“…Seed dormancy can be overcome by different presowing dormancy-breaking treatments such us dry heat treatment, hot water treatment, mechanical scarification, chemical scarification, stratification and treatment with growth regulators (Phuyal et al, 2022). Physical, mechanical and chemical treatments reduce exogenous seed dormancy by removing or permeabilizing the seed coat, while stratification and treatment with growth regulators reduce endogenous seed dormancy by neutralizing seed germination inhibitors (Lavallee et al, 2021). However, inappropriate dormancy-breaking treatment can result in failure to break dormancy and at worst kill the seeds (Kildisheva et al, 2020).…”