Differentiation in growth and biomass allocation among three native Alternanthera philoxeroides varieties from Argentina
Differentiation in growth and biomass allocation among three native Alternanthera philoxeroides varieties from Argentina
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DOI：
10.1111/j.1442-1984.2010.00271.x
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发表时间：
2010-05-01
影响因子：
1.4
通讯作者：
Chen, Jia-Kuan
中科院分区：
文献类型：
--
作者：
Jia, Xin;Pan, Xiao-Yun;Chen, Jia-Kuan
了解外来入侵植物的生活史特征，对于探索外来入侵植物的入侵起源和入侵机制具有重要意义。通过田间小区试验，研究了3个喜旱莲子草（Alternanthera philoxeroides var. obtusifolia、空心莲子草Alternanthera philoxeroides var. acutifolia和空心莲子草Alternanthera philoxeroides var. Lancifolia）。结果表明，高纬度地区的气候差异较大。obtuifolia的相对生长速率和植株大小较低。与此相反，低纬度地区。尖叶栎表现出明显的较高的生长势。中纬度地区。Lancifolia一般表现为中等生长势。关于分配，var。obtusifolia的生物量分配给贮藏根和叶的比例明显高于var. acutifolia和var. Lancifolia将更多的生物量分配给茎。这种变异模式可能是其地理分布和当地生境的进化分化的结果。尖叶和矛叶变种可能比变种具有更高的潜在入侵性。钝叶
Knowledge about the life-history traits of native conspecifics of exotic invasive plants can be of fundamental importance in exploring their origin of invasiveness and disentangling distinct invasion mechanisms. We conducted a common garden experiment to examine genetically based differentiation in growth and biomass allocation among three native Alternanthera philoxeroides varieties (Alternanthera philoxeroides var. obtusifolia, Alternanthera philoxeroides var. acutifolia and Alternanthera philoxeroides var. lancifolia) from Argentina. Results showed that the high-latitude var. obtusifolia had lower values of relative growth rate and plant size. In contrast, the low-latitude var. acutifolia showed distinctly higher growth vigor. The mid-latitude var. lancifolia generally showed intermediate growth vigor. Regarding allocation, var. obtusifolia allocated a distinctly higher proportion of biomass to storage roots and leaves, whereas var. acutifolia and var. lancifolia allocated more biomass to stems. This pattern of variation might be the outcome of evolutionary differentiation in response to their geographic distributions and local habitats. The acutifolia and lancifolia varieties may have higher potential invasiveness than var. obtusifolia.