Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1016/j.sajb.2013.09.006 |
Sap flow and water use in African baobab (Adansonia digitata L.) seedlings in response to drought stress | |
Van den Bilcke, N.; De Smedt, S.; Simbo, D. J.; Samson, R. | |
通讯作者 | Van den Bilcke, N. |
来源期刊 | SOUTH AFRICAN JOURNAL OF BOTANY
![]() |
ISSN | 0254-6299 |
EISSN | 1727-9321 |
出版年 | 2013 |
卷号 | 88页码:438-446 |
英文摘要 | The African baobab (Adansonia digitata L.) is an important multi-purpose fruit tree with high potential for domestication in drier Africa. Although adult individuals are well-known to be drought resistant, only little has been reported on how young baobab trees can survive drought Therefore, the aim of this study was to examine shortterm soil drought effects on water relations of baobab seedlings. Baobab seedlings used a limited amount of stored water to buffer daily water deficits (similar to 8.5 g d(-1)), which contributed up to only similar to 17.5% of daily water use and similar to 6% of total plant water. Under drought, a strong reduction in stomatal conductance (similar to 85%) resulted in a midday leaf water potential of -1 MPa and zero stem sap flow followed by significant leaf loss. Plant anatomy evidenced the presence of water storage tissues and the vulnerability to xylem embolism. The taproot was the most important plant part for water storage (68% of total plant water), suggesting root-succulence rather than stem-succulence. When drought intensified, limitation of leaf transpiration and/or root water uptake led to drought-enforced dormancy. Despite the large amounts of water stored in the taproot (similar to 90%) and the stem (similar to 75%), only a limited amount of stored water appeared to be used to sustain upper leaves and plant metabolism during the dormant period, and to facilitate recovery following water supply. Drought avoidance, conservative water use and the presence of internal stored water allow baobab seedlings to survive drought. (C) 2013 SAAB. Published by Elsevier BM. All rights reserved. |
英文关键词 | Semi-arid regions Stomatal conductance Sap flow Diameter fluctuations Water storage Drought avoidance |
类型 | Article |
语种 | 英语 |
国家 | Belgium |
收录类别 | SCI-E |
WOS记录号 | WOS:000328179500060 |
WOS关键词 | TREES ADANSONIA ; CORTICULAR PHOTOSYNTHESIS ; STOMATAL CONTROL ; USE STRATEGIES ; STORED WATER ; MASS-FLOW ; STORAGE ; BALANCE ; LEAF ; SOIL |
WOS类目 | Plant Sciences |
WOS研究方向 | Plant Sciences |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/180017 |
作者单位 | Univ Antwerp, Fac Sci, Dept Biosci Engn, B-2020 Antwerp, Belgium |
推荐引用方式 GB/T 7714 | Van den Bilcke, N.,De Smedt, S.,Simbo, D. J.,et al. Sap flow and water use in African baobab (Adansonia digitata L.) seedlings in response to drought stress[J],2013,88:438-446. |
APA | Van den Bilcke, N.,De Smedt, S.,Simbo, D. J.,&Samson, R..(2013).Sap flow and water use in African baobab (Adansonia digitata L.) seedlings in response to drought stress.SOUTH AFRICAN JOURNAL OF BOTANY,88,438-446. |
MLA | Van den Bilcke, N.,et al."Sap flow and water use in African baobab (Adansonia digitata L.) seedlings in response to drought stress".SOUTH AFRICAN JOURNAL OF BOTANY 88(2013):438-446. |
条目包含的文件 | 条目无相关文件。 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。