Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1046/j.1365-2435.1998.00276.x |
Root growth dependence on soil temperature for Opuntia ficus-indica: influences of air temperature and a doubled CO2 concentration | |
Drennan, PM; Nobel, PS | |
通讯作者 | Nobel, PS |
来源期刊 | FUNCTIONAL ECOLOGY
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ISSN | 0269-8463 |
EISSN | 1365-2435 |
出版年 | 1998 |
卷号 | 12期号:6页码:959-964 |
英文摘要 | 1. Root elongation as a function of soil temperature was determined for the CAM succulent Opuntia ficus-indica, under three different day/night air temperatures (15 degrees C/5 degrees C, 25 degrees C/15 degrees C and 35 degrees C/25 degrees C) and an ambient (360 mu mol mol(-1)) vs a doubled CO2 concentration (720 mu mol mol(-1)) at 25 degrees C/15 degrees C, the optimum temperature for net CO2 uptake. 2. Root elongation occurred at soil temperatures from 12 degrees C (at 15 degrees C/5 degrees C) to 43 degrees C (at 35 degrees C/25 degrees C) with optimum temperatures of 27-30 degrees C, similar to other CAM succulents and consistent with the distribution of this shallow-rooted species in warm regions. Although a doubled CO2 concentration did not alter the optimum or limiting soil temperatures, increases of up to 5 degrees C in these temperatures accompanied the 20 degrees C increase in day/night air temperatures. 3. Root elongation rates at optimum soil temperatures ranged from 5.4 mm day(-1) (15 degrees C/5 degrees C), through 6.6 mm day(-1) (25 degrees C/15 degrees C), to 10.4 mm day(-1) (35 degrees C/25 degrees C) with a 25% increase under a doubled CO2 concentration. Highest root elongation rates at 35 degrees C/25 degrees C may reflect changing root vs shoot sink strengths in a species with a highly plastic root system. 4. At limiting soil temperatures, the length of the cell division zone was reduced by an average of 20% and cell length at the mid-point of-the elongation zone by 10%. Increased root elongation rates under a doubled CO2 concentration reflected increased cell elongation. 5. The temperature response for the roots of O. ficus-indica and stimulation of elongation by a doubled CO2 concentration indicate that root growth for this highly productive species should be enhanced by predicted global climate change. |
英文关键词 | CAM succulent climate change morphological plasticity root anatomy |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000078526400012 |
WOS关键词 | GLOBAL CLIMATE-CHANGE ; ELEVATED CO2 ; DESERT SUCCULENTS ; CAM PLANT ; RESPONSES ; WATER ; ELONGATION ; EXCHANGE ; NITROGEN |
WOS类目 | Ecology |
WOS研究方向 | Environmental Sciences & Ecology |
来源机构 | University of California, Los Angeles |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/135755 |
作者单位 | (1)Loyola Marymount Univ, Dept Biol, Los Angeles, CA 90045 USA;(2)Univ Calif Los Angeles, Dept Biol, Los Angeles, CA 90095 USA |
推荐引用方式 GB/T 7714 | Drennan, PM,Nobel, PS. Root growth dependence on soil temperature for Opuntia ficus-indica: influences of air temperature and a doubled CO2 concentration[J]. University of California, Los Angeles,1998,12(6):959-964. |
APA | Drennan, PM,&Nobel, PS.(1998).Root growth dependence on soil temperature for Opuntia ficus-indica: influences of air temperature and a doubled CO2 concentration.FUNCTIONAL ECOLOGY,12(6),959-964. |
MLA | Drennan, PM,et al."Root growth dependence on soil temperature for Opuntia ficus-indica: influences of air temperature and a doubled CO2 concentration".FUNCTIONAL ECOLOGY 12.6(1998):959-964. |
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