Arid
DOI10.3732/ajb.1000286
ROOT CONTRACTION HELPS PROTECT THE "LIVING ROCK" CACTUS ARIOCARPUS FISSURATUS FROM LETHAL HIGH TEMPERATURES WHEN GROWING IN ROCKY SOIL
Garrett, Tadao Y.; Huynh, Cam-Van; North, Gretchen B.
通讯作者North, Gretchen B.
来源期刊AMERICAN JOURNAL OF BOTANY
ISSN0002-9122
EISSN1537-2197
出版年2010
卷号97期号:12页码:1951-1960
英文摘要

Premise of the study: We investigated how the "living rock" cactus Ariocarpus fissuratus, like other low-growing desert plants, can endure potentially lethal high temperatures at the soil surface. Specifically, we examined how shoot descent by root contraction in the presence or absence of soil rocks influences shoot temperatures and transpiration.


Methods: Root contraction was identified by measuring shoot descent and anatomical analysis. Temperatures and transpiration were measured for plants at two heights in sandy and rocky soil, and temperature tolerances were determined by vital staining.


Key results: Plants embedded in rocky soil survived an extreme heat episode, unlike plants in sandy soil, though rocks did not moderate low temperatures. Root contraction occurred regardless of season and soil moisture. Xylem conduits (wide-band tracheids) formed a compressible lattice that decreased root length as rays enlarged the root base radially. Plant position in the soil did not affect transpiration.


Conclusions: Contractile roots pulled plants of A. fissuratus into the soil at rates of 6-30 mm yr(-1). Maintaining shoots level with the soil surface kept plant temperatures below the high lethal temperature and improved survivorship in soil shaded by surface rocks.


英文关键词Ariocarpus fissuratus contractile roots desert plants heat avoidance LT50 rocky soil temperature tolerance wide-band tracheids
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000284760800015
WOS关键词WIDE-BAND TRACHEIDS ; WATER RELATIONS ; SONORAN DESERT ; CACTACEAE ; PLANTS ; MAMMILLARIA ; ADAPTATION ; SUCCULENTS ; TOLERANCES ; ECOLOGY
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/2XILL650/163125
作者单位Occidental Coll, Dept Biol, Los Angeles, CA 90041 USA
推荐引用方式
GB/T 7714
Garrett, Tadao Y.,Huynh, Cam-Van,North, Gretchen B.. ROOT CONTRACTION HELPS PROTECT THE "LIVING ROCK" CACTUS ARIOCARPUS FISSURATUS FROM LETHAL HIGH TEMPERATURES WHEN GROWING IN ROCKY SOIL[J],2010,97(12):1951-1960.
APA Garrett, Tadao Y.,Huynh, Cam-Van,&North, Gretchen B..(2010).ROOT CONTRACTION HELPS PROTECT THE "LIVING ROCK" CACTUS ARIOCARPUS FISSURATUS FROM LETHAL HIGH TEMPERATURES WHEN GROWING IN ROCKY SOIL.AMERICAN JOURNAL OF BOTANY,97(12),1951-1960.
MLA Garrett, Tadao Y.,et al."ROOT CONTRACTION HELPS PROTECT THE "LIVING ROCK" CACTUS ARIOCARPUS FISSURATUS FROM LETHAL HIGH TEMPERATURES WHEN GROWING IN ROCKY SOIL".AMERICAN JOURNAL OF BOTANY 97.12(2010):1951-1960.
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