Deep simple morphophysiological dormancy in seeds of the basal taxad Cephalotaxus

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	Deep simple morphophysiological dormancy in seeds of the basal taxad Cephalotaxus
	Chia Ju Yang ; et al.
刊名	Seed Science Research
	2011
卷号	21 期号:3 页码:215-226
中文摘要	Although mature seeds of the monogeneric conifer family Cephalotaxaceae sensu stricto have underdeveloped embryos, no definitive studies have been done to classify dormancy in this family. Our primary purpose was to determine the kind of dormancy in seeds of Cephalotaxus wilsoniana and to put the results into a broad phylogenetic context for gymnosperms. The species is of horticultural and medicinal value, and information is needed on how to propagate it efficiently from seeds. Embryo growth and germination were monitored for seeds at warm, cold and warm plus cold temperatures, and germination was monitored for seeds subjected to: (1) cold → warm → cold → warm; and (2) warm → cold → warm → cold → warm temperature sequences. The effects of gibberellic acids GA₃ and GA₄ were tested on radicle emergence in ungerminated seeds and on shoot emergence in root-emerged seeds. Germination was promoted by ≥ 36 weeks of warm stratification followed by ≥ 8 weeks of cold stratification, but only if seeds were returned to high temperatures. The underdeveloped embryo must increase in length by >120% before the radicle emerges. Neither GA₃ nor GA₄ was effective in promoting radicle emergence; however, both plant growth regulators increased rate (but not percentage) of shoot emergence in root-emerged seeds. We conclude that seeds of C. wilsoniana have the deep simple level of morphophysiological dormancy (MPD), C_1b-C₃-B_1b; thus, warm stratification followed by cold stratification and then warm-temperature incubation are required for germination. In gymnosperms, MPD is known in cycads, Ginkgo and now in three families of conifers.
公开日期	2013-10-28
内容类型	期刊论文
源URL	[http://ir.xtbg.org.cn/handle/353005/4733]
专题	西双版纳热带植物园_文献共享
推荐引用方式 GB/T 7714	Chia Ju Yang,et al.. Deep simple morphophysiological dormancy in seeds of the basal taxad Cephalotaxus[J]. Seed Science Research,2011,21(3):215-226.
APA	Chia Ju Yang,&et al..(2011).Deep simple morphophysiological dormancy in seeds of the basal taxad Cephalotaxus.Seed Science Research,21(3),215-226.
MLA	Chia Ju Yang,et al."Deep simple morphophysiological dormancy in seeds of the basal taxad Cephalotaxus".Seed Science Research 21.3(2011):215-226.