Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/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
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ISSN | 0140-1963 |
EISSN | 1095-922X |
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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