Knowledge Resource Center for Ecological Environment in Arid Area
DOI | 10.1002/ajb2.1166 |
Gas exchange characteristics of giant cacti species varying in stem morphology and life history strategy | |
Huber, John1,2; Dettman, David L.2; Williams, David G.3; Hultine, Kevin R.1 | |
通讯作者 | Hultine, Kevin R. |
来源期刊 | AMERICAN JOURNAL OF BOTANY
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ISSN | 0002-9122 |
EISSN | 1537-2197 |
出版年 | 2018 |
卷号 | 105期号:10页码:1688-1702 |
英文摘要 | Premise of the Study Methods Giant cacti species possess long cylindrical stems that store massive amounts of water and other resources to draw on for photosynthesis, growth, and reproduction during hot and dry conditions. Across all giant cacti taxa, stem photosynthetic surface area to volume ratio (S:V) varies by several fold. This broad morphological diversity leads to the hypothesis that giant cacti function along a predictable resource use continuum from a "safe" strategy reflected in low S:V, low relative growth rates (RGR), and low net assimilation rates (A(net)) to a high-risk strategy that is reflected in high S:V, RGR, and A(net). To test this hypothesis, whole-plant gas exchange, chlorophyll fluorescence, and whole-spine-tissue carbon isotope ratios (delta C-13) were measured in four giant cacti species varying in stem morphology and RGR. Measurements were conducted on five well-watered, potted plants per species. Key Results Conclusions Under conditions of mild diel temperatures and low atmospheric vapor pressure deficit, A(net), transpiration (E), and stomatal conductance (G(s)) were significantly higher, and water-use efficiency (A(net) : G(s)) was lower in fast-growing, multi-stemmed species compared to the slower growing, single-stemmed species. However, under warmer, less optimal conditions, gas exchange converged between stem types, and neither delta C-13 nor chlorophyll fluorescence varied among species. The results add to a growing body of evidence that succulent-stemmed plants function along a similar economic spectrum as leaf-bearing plants such that functional traits including stem RGR, longevity, morphology, and gas exchange are correlated across species with varying life-history strategies. |
英文关键词 | Cactaceae carbon isotope ratios net assimilation rate Sonoran Desert stem economic trait spectrum stem succulents stem surface area to volume ratio |
类型 | Article |
语种 | 英语 |
国家 | USA |
收录类别 | SCI-E |
WOS记录号 | WOS:000449490000008 |
WOS关键词 | CRASSULACEAN ACID METABOLISM ; OPUNTIA-FICUS-INDICA ; RELATIVE GROWTH-RATE ; CARBON-ISOTOPE DISCRIMINATION ; LEAF ECONOMICS SPECTRUM ; NET ASSIMILATION RATE ; SAGUARO CACTUS ; CARNEGIEA-GIGANTEA ; SONORAN DESERT ; COLUMNAR CACTI |
WOS类目 | Plant Sciences |
WOS研究方向 | Plant Sciences |
来源机构 | University of Arizona |
资源类型 | 期刊论文 |
条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/207486 |
作者单位 | 1.Desert Bot Garden, Dept Res Conservat & Collect, Phoenix, AZ 85008 USA; 2.Univ Arizona, Dept Geosci, Tucson, AZ 85721 USA; 3.Univ Wyoming, Dept Bot, Laramie, WY 82071 USA |
推荐引用方式 GB/T 7714 | Huber, John,Dettman, David L.,Williams, David G.,et al. Gas exchange characteristics of giant cacti species varying in stem morphology and life history strategy[J]. University of Arizona,2018,105(10):1688-1702. |
APA | Huber, John,Dettman, David L.,Williams, David G.,&Hultine, Kevin R..(2018).Gas exchange characteristics of giant cacti species varying in stem morphology and life history strategy.AMERICAN JOURNAL OF BOTANY,105(10),1688-1702. |
MLA | Huber, John,et al."Gas exchange characteristics of giant cacti species varying in stem morphology and life history strategy".AMERICAN JOURNAL OF BOTANY 105.10(2018):1688-1702. |
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