Seed germination and seedling emergence in the extremely endangered species Rhododendron protistum var. giganteum-the world's largest Rhododendron

doi:10.1016/j.flora.2015.08.006

	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
DOI	10.1016/j.flora.2015.08.006
收录类别	SCI
语种	英语
WOS记录号	WOS:000363352500008
引用统计
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.

条目包含的文件		下载所有文件
文件名称/大小	文献类型	版本类型	开放类型	使用许可
FLORA-Rhododendron.p（1295KB）	期刊论文	作者接受稿	开放获取	CC BY-NC-SA	浏览下载