Seed germination and dormancy breaking for Dichotomanthes tristaniaecarpa (Rosaceae), a narrowly distributed and endemic species in south-western China
Dichotomanthes tristaniaecarpa Kurz, is an endemic and rare ornamental and medicinal plant in south-western China's Yunan and Sichuan provinces. In natural conditions, germination is extremely low and progresses slowly. Different treatments were evaluated to develop a protocol for accelerating the germination of this species. For dormancy-broken seeds, the condition of 10/20°C with a 12 h light period was appropriate. Cold stratification for 60 days resulted in significantly increasing final germination percentages from 13 (fresh seeds) to 97%, the median germination time (MGT) was approximately 17 d and is therefore recommended as the practical germination pre-treatment for propagating D. tristaniaecarpa by seeds. Moreover, among four concentrations applied, 200 mg·L−1 of GA3 was more effective for accelerating germination of 40-d dry stratified seeds and its MGT was about 12 d. Based on the results, 60-d cold stratification (4°C) was the optimal means for alleviating the primary dormancy.
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Document Type: Research Article
Publication date: October 1, 2010
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