Stimulatory and inhibitory effects of light on Cereus repandus (Cactaceae) seed germination are strongly dependent on spectral quality

doi:10.1017/S0960258522000150

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	Stimulatory and inhibitory effects of light on Cereus repandus (Cactaceae) seed germination are strongly dependent on spectral quality
	Yang, X-Y; Pritchard, Hugh W.
	2022
发表期刊	SEED SCIENCE RESEARCH
页码	PII S0960258522000150
摘要	In small seeds, light often promotes germination and longer-term exposure to darkness reduces light sensitivity. In cacti inhabiting harsh environments, a rapid response to light exposure is potentially advantageous for seedling establishment. We exposed dark-imbibed seeds of the cactus Cereus repandus to doses of red (RED) light and far-red (FR) light. The seeds exhibited positive photoblastism to RED light. Although the initial levels of germination varied between seed lots, the sensitivity to increasing the RED dose did not. As little as 5 min per day for 4 d was sufficient to saturate the light requirement for germination. The effects of RED light were reversed by FR exposure as long as the interval between RED and FR did not extend to 2 d, by which time the seeds had 'committed' to germinate. Dark incubation for 1-2 weeks prior to RED exposure reduced light sensitivity in two seed lots, such that RED only promoted around 20% germination. Phytochrome is assumed to mediate the reversibility of the RED:FR response. High sensitivity to light spectral quality suggests that seeds of C. repandus are able to germinate quickly in high-quality microsites, but seed burial or shading may commit the seeds to form a soil seed bank. The light characteristics of the germination trait in this species are typical of many small seeded species of the drylands.
关键词	dark-induced dormancy light dose neglected and underutilized species R-FR light reversibility seed traits FLUENCE-RESPONSE CURVES TEMPERATURE ECOLOGY TRAITS SOIL PENETRATION EMERGENCE VIVIPARY DESERT FAMILY
DOI	10.1017/S0960258522000150
收录类别	SCI
WOS记录号	WOS:000850365700001
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/74713
专题	中国科学院昆明植物研究所
推荐引用方式 GB/T 7714	Yang, X-Y,Pritchard, Hugh W.. Stimulatory and inhibitory effects of light on Cereus repandus (Cactaceae) seed germination are strongly dependent on spectral quality[J]. SEED SCIENCE RESEARCH,2022:PII S0960258522000150.
APA	Yang, X-Y,&Pritchard, Hugh W..(2022).Stimulatory and inhibitory effects of light on Cereus repandus (Cactaceae) seed germination are strongly dependent on spectral quality.SEED SCIENCE RESEARCH,PII S0960258522000150.
MLA	Yang, X-Y,et al."Stimulatory and inhibitory effects of light on Cereus repandus (Cactaceae) seed germination are strongly dependent on spectral quality".SEED SCIENCE RESEARCH (2022):PII S0960258522000150.

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