Arid
DOI10.1046/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
ISSN0269-8463
EISSN1365-2435
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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