Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.3732/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
![]() |
ISSN | 0002-9122 |
EISSN | 1537-2197 |
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. |
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。