Seed dormancy concepts in orchids: Dendrobium cruentum as a model species

doi:10.1017/S0960258522000198

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	Seed dormancy concepts in orchids: Dendrobium cruentum as a model species
	Prasongsom, Sasikarn; Thammasiri, Kanchit; Pritchard, Hugh W.
	2022
发表期刊	SEED SCIENCE RESEARCH
卷号	32 期号:3 页码:175-186
摘要	Generally, orchids produce dust-like seeds in which endosperm reduction and embryo undifferentiation represent a derived state shared with species in about 11 other plant families. Orchid seeds are proposed to have a special kind of morphological or morphophysiological dormancy. We test this proposition, overcoming several design limitations of earlier studies, specifically that the in vitro germination method for orchid seeds uses pro-oxidants for disinfection and incorporates nitrate in the medium; both 'treatments' might contribute to dormancy breaking, potentially confounding judgement on the depth and nature of the dormant state. Seeds of the tropical orchid Dendrobium cruentum Rchb. f., were sown both in vitro, on a nutrient medium, and ex vitro, on plain agar omitting prior disinfection with sodium hypochlorite. Seeds previously stored and fresh seeds were incubated under combinations of vitro conditions, light treatments, constant or alternating temperatures and nitrate concentration. Seeds of D. cruentum are very small but have a large embryo that occupies most of the seed. Over a range of constant temperature seeds germinated to the spherical protocorm stage just as well ex vitro as in vitro. Neither light nor nitrate were prerequisites for ex vitro germination. The ability of D. cruentum seed to germinate in the absence of environmental or chemical stimuli suggests that mature seed can be non-dormant. Our results support the proposition that neither all DUST seed fit a dormancy class nor all orchids produce morphological or morphophysiological seeds. Finally, embryo/seed volume determinations in orchids may prove as valuable in studies on the evolution and ecology of germination and dormancy as embryo:seed ratios in other angiosperm species.
关键词	dendrobium orchid dormancy DUST seeds embryo volume germination nitrate temperature MATURE SEEDS DESICCATION TOLERANCE GERMINATION TERRESTRIAL LONGEVITY EVOLUTION DIVERSIFICATION TEMPERATURE MORPHOMETRY PLANTS
DOI	10.1017/S0960258522000198
收录类别	SCI
WOS记录号	WOS:000888622300009
引用统计	被引频次：2[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/151853/74719
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Prasongsom, Sasikarn,Thammasiri, Kanchit,Pritchard, Hugh W.. Seed dormancy concepts in orchids: Dendrobium cruentum as a model species[J]. SEED SCIENCE RESEARCH,2022,32(3):175-186.
APA	Prasongsom, Sasikarn,Thammasiri, Kanchit,&Pritchard, Hugh W..(2022).Seed dormancy concepts in orchids: Dendrobium cruentum as a model species.SEED SCIENCE RESEARCH,32(3),175-186.
MLA	Prasongsom, Sasikarn,et al."Seed dormancy concepts in orchids: Dendrobium cruentum as a model species".SEED SCIENCE RESEARCH 32.3(2022):175-186.

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