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Free Content Dormancy and germination of Firmiana danxiaensis, an endangered tree endemic to South China

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Firmiana danxiaensis (Malvaceae) is a rare and endemic tree of South China. It has a very narrow distribution with only two extant populations in the wild. The aim of this study was to understand the nature of its seed dormancy, how to break the dormancy and the environmental requirements for the natural germination of its seeds. To identify whether seeds of F. danxiaensis are dormant, germination experiments with 12 treatments (three light levels × four temperatures) were conducted. To determine the optimal way to break dormancy, we conducted the dormancy-breaking experiment with five treatments, including physical and chemical methods. The results showed that the dormancy of F. danxiaensis seeds was associated with a water- impermeable seed coat, i. e., the seeds have physical dormancy. Soaking the seeds in 98% concentrated sul phuric acid for one hour overcame the physical dormancy and enabled imbibition followed by germination (up to 73%). Once dormancy was broken, F. danxiaensis seeds could germinate over a wide range of temperatures in both light and darkness. The results suggest that ex situ conservation and reintroduction of F. danxiaensis might be achieved by sowing acid-treated seeds at restoration sites at the appropriate time of year.

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Keywords: ACID SCARIFICATION; ENDANGERED PLANT; FIRMIANA DANXIAENSIS; GERMINATION; PHYSICAL DORMANCY; SOUTH CHINA

Document Type: Research Article

Publication date: December 1, 2019

This article was made available online on November 1, 2019 as a Fast Track article with title: "Dormancy and germination of Firmiana danxiaensis, an endangered tree endemic to South China".

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  • Seed Science and Technology (SST) is one of the leading international journals featuring original papers and review articles on seed quality and physiology as related to seed production, harvest, processing, sampling, storage, distribution and testing. This widely recognised journal is designed to meet the needs of researchers, advisers and all those involved in the improvement and technical control of seed quality.
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