Arid
DOI10.1016/j.jaridenv.2015.10.008
Environmental requirements for germination of dispersion units of Welwitschia mirabilis Hook. fil
Di Salvatore, M.; Carafa, A. M.; Carratu, G.
通讯作者Carafa, A. M.
来源期刊JOURNAL OF ARID ENVIRONMENTS
ISSN0140-1963
EISSN1095-922X
出版年2016
卷号125页码:116-121
英文摘要

Welwitschia mirabilis is gymnosperm endemic to the Namib Desert. Welwitschia seeds are dispersed enveloped by the winged perianth which contains, according to some authors, a germination inhibitor. In this work, after testing for the presence of an inhibitor, we determined the effects of environmental parameters (light, temperature, water limiting conditions and salinity) on the germination of dispersion units of Welwitschia.


We found that the winged perianth does not contain a germination inhibitor, seeds can germinate in both light and dark, and germination occurs in a range of temperatures between 15 degrees C and 40 degrees C, with an optimum temperature of 25-30 degrees C. Further, germination time decreased progressively and significantly along with the increase in temperature. Dispersion units subjected to water limiting conditions in a water vapor state were able to germinate up to a threshold limit (-1.5 MPa) below which germination decreases to nil. Welwitschia may be regarded as an halophyte species because, when the seeds are in contact with the salt solution in the Petri dish technique, additional salt toxicity is not shown, and reduced germination should therefore be attributed exclusively to water stress rather than ionic effect of salt. (C) 2015 Elsevier Ltd. All rights reserved.


英文关键词Welwitschia mirabilis Winged perianth Seed germination Saline stress Temperature Light Water stress Halophytes
类型Article
语种英语
国家Italy
收录类别SCI-E
WOS记录号WOS:000366773000016
WOS关键词NIGER VAR. PHOENICIS ; SEED-GERMINATION ; NAMIB DESERT ; TEMPERATURE ; GROWTH ; SALINITY ; LIGHT ; PLANT ; ECOPHYSIOLOGY ; ESTABLISHMENT
WOS类目Ecology ; Environmental Sciences
WOS研究方向Environmental Sciences & Ecology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/194080
作者单位Univ Naples Federico II, Dipartimento Agr, I-80055 Portici, Italy
推荐引用方式
GB/T 7714
Di Salvatore, M.,Carafa, A. M.,Carratu, G.. Environmental requirements for germination of dispersion units of Welwitschia mirabilis Hook. fil[J],2016,125:116-121.
APA Di Salvatore, M.,Carafa, A. M.,&Carratu, G..(2016).Environmental requirements for germination of dispersion units of Welwitschia mirabilis Hook. fil.JOURNAL OF ARID ENVIRONMENTS,125,116-121.
MLA Di Salvatore, M.,et al."Environmental requirements for germination of dispersion units of Welwitschia mirabilis Hook. fil".JOURNAL OF ARID ENVIRONMENTS 125(2016):116-121.
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