Hybrid Tamarix widespread in US invasion and undetected in native Asian range

被引:307
作者
Gaskin, JF
Schaal, BA
机构
[1] Missouri Bot Garden, St Louis, MO 63110 USA
[2] Washington Univ, Dept Biol, St Louis, MO 63130 USA
关键词
D O I
10.1073/pnas.132403299
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Biological invasions are drastically altering natural habitats and threatening biodiversity on both local and global levels. In one of the United States' worst invasions, Eurasian Tamarix plant species have spread rapidly to dominate over 600,000 riparian and wetland hectares. The largest Tamarix invasion consists of Tamarix chinensis and Tamarix ramosissima, two morphologically similar species. To clarify the identity, origins, and population structuring of this invasion, we analyzed DNA sequence data from an intron of a nuclear gene, phosphoenolpyruvate carboxylase (PepC). This intron proved to be highly variable at the population level, and the 269 native and invasive specimens yielded 58 haplotypes, from which we constructed a gene genealogy. Only four of these haplotypes were common to both the U.S. and Eurasia. Surprisingly, we found that the most common plant in this U.S. invasion is a hybrid combination of two species-specific genotypes that were geographically isolated in their native Eurasian range. Less extensive hybrids exist in the invasion, involving combinations of T. ramosissima and T. chinensis with Tamarix parviflora and Tamarix gallica. The presence of potentially novel hybrids in the U.S. illustrates how importation of exotics can alter population structures of species and contribute to invasions.
引用
收藏
页码:11256 / 11259
页数:4
相关论文
共 28 条
[1]   GENE TREES AND ORGANISMAL HISTORIES - A PHYLOGENETIC APPROACH TO POPULATION BIOLOGY [J].
AVISE, JC .
EVOLUTION, 1989, 43 (06) :1192-1208
[2]  
Baker HG, 1965, GENETICS COLONIZING
[3]  
Baum B., 1978, THE GENUS TAMARIX
[4]  
BAUM BERNARD R., 1967, BAILEYA QUART J HORTICULT TAXONOMY, V15, P19
[5]  
Brotherson J.D., 1987, Rangelands, V9, P110
[6]  
CLARK AG, 1990, MOL BIOL EVOL, V7, P111
[7]   THE TAMARICACEAE IN THE SOUTHEASTERN UNITED-STATES [J].
CRINS, WJ .
JOURNAL OF THE ARNOLD ARBORETUM, 1989, 70 (03) :403-425
[8]  
DeLoach C. J., 2000, Proceedings of the X International Symposium on Biological Control of Weeds, Bozeman, Montana, USA, 4-14 July, 1999, P819
[9]  
DELOACH CJ, 1997, EFFECTS BIOL CONTROL
[10]   Impact, biology, and ecology of saltcedar (Tamarix spp.) in the southwestern United States [J].
Di Tomaso, JM .
WEED TECHNOLOGY, 1998, 12 (02) :326-336