Toward understanding the ecological role of mucilage in seed germination of a desert shrub Henophyton deserti: interactive effects of temperature, salinity and osmotic stress

doi:10.1007/s11104-013-1920-9

	Toward understanding the ecological role of mucilage in seed germination of a desert shrub Henophyton deserti: interactive effects of temperature, salinity and osmotic stress
	Gorai, Mustapha ; El Aloui, Wiem 1; Yang, Xuejun 2; Neffati, Mohamed 1
	2014
发表期刊	PLANT AND SOIL
ISSN	0032-079X
卷号	374 期号:1-2 页码:727-738
摘要	Seeds of Henophyton deserti (Brassicaceae), an endemic saharan shrub in south Tunisia, produce a pectinaceous mucilage layer that can imbibe a large amount of water when wetted. The aim of this study was to explore the role of mucilage in seed germination of this shrub under heterogeneous stressful environments. Germination of both intact and demucilaged seeds was tested over wide ranges of temperature, and in iso-osmotic solutions of NaCl and PEG. Recovery of germination after NaCl and Polyethylene Glycol (PEG)-6000 treatment was also tested. The effect of mucilage on water uptake was measured and the structure of the seed investigated. A considerable proportion of seed mass (30 %) is made up of mucilage, which is extremely hydrophilic and able to increase seed mass by 550 % over dry seeds. Mucilage water uptake appears to be unaffected by salt concentration, while higher concentrations of PEG inhibit mucilage hydration. Mucilage decreases germination specifically at 10 A degrees C and this effect can be interpreted in relation to oxygen uptake. High concentrations of NaCl and PEG decrease both germination percentage and rate, with some greater tolerance at 15 A degrees C and 20 A degrees C versus 25 A degrees C. Recovery was higher from higher concentrations of NaCl and PEG and lower temperatures, with a clear inhibitory effect of mucilage. The study has shown that the mucilage of H. deserti may act as a physical barrier for regulating diffusion of water and oxygen to the inner tissue of the seed and thereby prevent germination under unsuitable conditions.
关键词	Drought Germination Henophyton deserti Mucilage Salinity Recovery Temperature
学科领域	Agronomy ; Plant Sciences ; Soil Science
DOI	10.1007/s11104-013-1920-9
收录类别	SCI
语种	英语
WOS关键词	ARTEMISIA-SPHAEROCEPHALA ASTERACEAE ; NEGEV DESERT ; HALOXYLON-AMMODENDRON ; COAT MUCILAGE ; ARABIDOPSIS ; RESPONSES ; ISRAEL ; LIGHT ; BRASSICACEAE ; VERMICULATA
WOS研究方向	Agriculture ; Plant Sciences
WOS记录号	WOS:000328849200054
出版者	SPRINGER
文献子类	Article
出版地	DORDRECHT
EISSN	1573-5036
作者邮箱	gorai.mustapha@yahoo.fr
引用统计	被引频次：46[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ibcas.ac.cn/handle/2S10CLM1/27276
专题	植被与环境变化国家重点实验室
作者单位	1.Inst Super Biol Appl Medenine, Dept Sci Environm, Medenine 4119, Tunisia 2.Inst Reg Arides, Lab Ecol Pastorale, Medenine 4119, Tunisia 3.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China
推荐引用方式 GB/T 7714	Gorai, Mustapha,El Aloui, Wiem,Yang, Xuejun,et al. Toward understanding the ecological role of mucilage in seed germination of a desert shrub Henophyton deserti: interactive effects of temperature, salinity and osmotic stress[J]. PLANT AND SOIL,2014,374(1-2):727-738.
APA	Gorai, Mustapha,El Aloui, Wiem,Yang, Xuejun,&Neffati, Mohamed.(2014).Toward understanding the ecological role of mucilage in seed germination of a desert shrub Henophyton deserti: interactive effects of temperature, salinity and osmotic stress.PLANT AND SOIL,374(1-2),727-738.
MLA	Gorai, Mustapha,et al."Toward understanding the ecological role of mucilage in seed germination of a desert shrub Henophyton deserti: interactive effects of temperature, salinity and osmotic stress".PLANT AND SOIL 374.1-2(2014):727-738.

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