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
发表期刊FLORA
卷号216页码:65-70
摘要Big 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.
关键词Big Tree Rhododendron Conservation Gibberellic Acid Photoperiod Threatened Species
资助信息National Science Foundation of China(31360155; U1302262)
DOI10.1016/j.flora.2015.08.006
收录类别SCI
语种英语
WOS研究方向Plant Sciences ; Environmental Sciences & Ecology
WOS类目Plant Sciences ; Ecology
WOS记录号WOS:000363352500008
引用统计
被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/25219
专题资源植物与生物技术所级重点实验室
推荐引用方式
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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