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Seed germination and seedling emergence in the extremely endangered species Rhododendron protistum var. giganteum-the world's largest Rhododendron
Shen, Shi-Kang; Wu, Fu-Qin; Yang, Guan-Song; Wang, Yue-Hua; Sun, Wei-Bang
2015
Source PublicationFLORA
Volume216Pages:65-70
AbstractBig tree rhododendron, Rhododendron protistum var. giganteum (Ericaceae) is an endangered and important germplasm source with high ornamental value in China. To design appropriate germination and seedling establishment protocols for a species conservation and restoration program, we studied the effects of temperature, photoperiod, storage, and gibberellic acid (GA(3)) treatment on seed germination in a laboratory experiment. The effects of soil substrate and sowing depth on seedling emergence were studied in a greenhouse experiment. We hypothesized that photoperiod is a limiting factor for seed germination of big tree rhododendron, and soil type and sowing depth would affect seedling emergence. Results showed that seeds of big tree rhododendron were non-dormant, and temperature significantly affected germination percentages (GP) and mean germination time (MGT). The optimal temperatures for seed germination were relatively low (15 degrees C and 20 degrees C). High temperature negatively affected seed germination. The seeds had less than 5% of GP when incubated in complete darkness, suggesting that darkness significantly inhibits seed germination. Storage period and temperature had significant effect on GP and MGT of big tree rhododendron seeds, and the effect of their interaction on MGT was also significant. GA(3) treatment increased GP and germination speed. Soil substrates did not significantly affect seedling emergence, but native soil is beneficial to seedling growth. When the seeds were sown on the soil surface, seedling emergence was higher than 80%, but it decreased with increasing sowing depth, and no seedling emerged at 3 cm soil depth. We present some suggestions for the ex situ conservation and restoration program, including seed germination and seedling artificial propagation of big tree rhododendron based on the research results. (C) 2015 Elsevier GmbH. All rights reserved.
KeywordBig Tree Rhododendron Conservation Gibberellic Acid Photoperiod Threatened Species
DOI10.1016/j.flora.2015.08.006
Indexed BySCI
Language英语
WOS Research AreaPlant Sciences ; Environmental Sciences & Ecology
WOS SubjectPlant Sciences ; Ecology
WOS IDWOS:000363352500008
Citation statistics
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/25219
Collection资源植物与生物技术所级重点实验室
Recommended Citation
GB/T 7714
Shen, Shi-Kang,Wu, Fu-Qin,Yang, Guan-Song,et al. Seed germination and seedling emergence in the extremely endangered species Rhododendron protistum var. giganteum-the world's largest Rhododendron[J]. FLORA,2015,216:65-70.
APA Shen, Shi-Kang,Wu, Fu-Qin,Yang, Guan-Song,Wang, Yue-Hua,&Sun, Wei-Bang.(2015).Seed germination and seedling emergence in the extremely endangered species Rhododendron protistum var. giganteum-the world's largest Rhododendron.FLORA,216,65-70.
MLA Shen, Shi-Kang,et al."Seed germination and seedling emergence in the extremely endangered species Rhododendron protistum var. giganteum-the world's largest Rhododendron".FLORA 216(2015):65-70.
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