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Winter low temperature disturbance in the southern subtropics of China promotes the competitiveness of an invasive plant

文献类型： 外文期刊

作者： Yue, Maofeng 1 ; Shen, Hao 3 ; Ye, Wanhui 3 ; Li, Weihua 5 ; Chen, Jinfeng 6 ;

作者机构： 1.Guangdong Univ Petrochem Technol, Sch Biol & Food Engn, Maoming 525000, Peoples R China

2.Guangdong Lab Lingnan Modern Agr, Maoming Branch, Maoming 525000, Peoples R China

3.Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Ec, South China Bot Garden, Ctr Plant Ecol,Core Bot Gardens, Guangzhou 510650, Peoples R China

4.Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511458, Peoples R China

5.South China Normal Univ, Guangdong Prov Key Lab Biotechnol Plant Dev, Guangzhou Key Lab Subtrop Biodivers & Biomonitori, Sch Life Sci, Guangzhou 510631, Peoples R China

6.Guangdong Acad Agr Sci, Environm Hort Res Inst, Guangdong Prov Key Lab Ornamental Plant Germplasm, Guangzhou 510640, Peoples R China

关键词： Low temperature disturbance; Southern subtropics; Invasive plant; Bidens pilosa; Competitiveness; Physiological responses

期刊名称：BIOLOGICAL INVASIONS （ 影响因子：3.087； 五年影响因子：3.137 ）

ISSN： 1387-3547

年卷期：

页码：

收录情况： SCI

摘要： Winter low temperature disturbance in the southern subtropics has important effects on the weed community structure, but the role of uniquely low temperatures in biological invasions is unclear. Here, we examined the competitive effects of an invasive plant, Bidens pilosa L., and its native congener, Bidens biternata (Lour.) Merr. et Sherff, during high and low temperature seasons to determine whether low temperatures promote the competitiveness of B. pilosa in the southern subtropics of China. The growth and physiological responses of the two Bidens species to low (10/5 degrees C) and optimum (30/25 degrees C) temperatures were examined to determine how the invasive B. pilosa responds to low temperature stress. Our results showed that the competitive balance index values of B. pilosa in low temperature seasons were significantly higher than those in high temperature seasons, which implied that low temperatures may be more beneficial to the competitiveness of B. pilosa than high temperatures in the southern subtropics. The smaller decline in the relative growth rate and the photosynthetic ability of B. pilosa compared with B. biternata under low temperature stress indicated that the former was less negatively affected by low temperature than the latter. A higher DPPH center dot (1.1-diphenyl-2-picrylhy-drazyl) scavenging rate and greater heat-stable protein content in B. pilosa under low temperatures might help the invasive plant to maintain more effective physiological functions and thus a higher growth rate. Overall, the uniquely low temperature in the southern subtropics of China is expected to promote the invasiveness of the exotic B. pilosa.

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