Field Sandbur (Cenchrus pauciflorus) Seeds in the Same Bur Respond Differently to Temperature and Water Potential in Relation to Germination in a Semi-Arid Environment, China.
Field Sandbur (Cenchrus pauciflorus) Seeds in the Same Bur Respond Differently to Temperature and Water Potential in Relation to Germination in a Semi-Arid Environment, China.
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DOI：
10.1371/journal.pone.0168394
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Wang Q
中科院分区：
文献类型：
--
作者：
Zhang Z;Tian X;Bai Y;Liu H;Niu X;Wang Z;Wang Q
生物入侵的成功依赖于环境，与水和温度等因素密切相关。入侵植物物种表现出不同的种子特征，包括形状。少花蒺藜（Cenchrus pauciflorus）是一种在全球范围内广泛分布的入侵植物，具有较强的适应性。然而，其萌发对水分和温度的反应仍然不清楚。C.在同一个刺中含有两个大小不同的种子：大种子（M）和小种子（P）。在不同的温度制度（0/10°C、5/15°C、10/20°C、15/25°C、18/28°C、20/30°C和25/35°C）和水势（-1.50Mpa、-1.00Mpa、-0.75Mpa、-0.50Mpa、-0.25Mpa和0 Mpa）下对M和P种子进行单独的温室实验。结果支持了C.种子类型、温度和水势对少花型的影响显著。M和P种子不同的响应不同的替代温度和水势。而M和P种子对水势的敏感性高于对温度的敏感性。M和P种子萌发的最佳条件分别在25/35°C（夜温/昼温）和20/30°C下测量。相反，在0 Mpa的水势处理下，发芽率最高。此外，M的基础温度（Tbase）和基础水势（Wbase）（7.7°C，10/20°C时-1.11Mpa，20/30°C时-1.07Mpa）低于P（9.4°C，10/20°C时-0.92Mpa，20/30°C时-0.52Mpa）。这些不同的萌发策略的M和P种子相对于温度和水势增加整体植物繁殖。这些结果表明，热带和亚热带地区的水势超过-0.50Mpa（10/20°C）或-1.00Mpa（20/30°C）时，面临着潜在的C风险。少花入侵
The success of a biological invasion relies on the environment and is closely linked to factors such as water and temperature. Invasive plant species display different seed characteristics, including shape. Field sandbur (Cenchrus pauciflorus) is a globally widespread invasive species capable of adapting to broad environmental conditions. However, its germination response to water and temperature still remains unclear. C. pauciflorus contains two seeds in the same bur that differ in size: big seeds (M) and small seeds (P). Separate greenhouse experiments were conducted under different temperature regimes (0/10°C, 5/15°C, 10/20°C, 15/25°C, 18/28°C, 20/30°C and 25/35°C) and water potentials (-1.50Mpa, -1.00Mpa, -0.75Mpa, -0.50Mpa, -0.25Mpa and 0Mpa) for M and P seeds. The results support the hypothesis that germination of C. pauciflorus is significantly influenced by seed type, temperature and water potential. M and P seeds responded differently to varied alternative temperatures and water potentials. However, M and P seeds were more sensitive to water potential than to temperature. Optimal conditions for M and P seed germination were measured at 25/35°C (night temperature/day temperature) and 20/30°C, respectively. In contrast, the highest germination rate was observed for the 0Mpa of the water potential treatment. Additionally, base temperature (Tbase) and base water potential (Wbase) were lower for M (7.7°C, -1.11Mpa at 10/20°C, and -1.07Mpa at 20/30°C) than for P (9.4°C, -0.92Mpa at 10/20°C, and -0.52Mpa at 20/30°C). These different germination strategies of M and P seeds with respect to temperature and water potential increased overall plant propagation. These results indicate that tropical and subtropical regions water potentials beyond -0.50Mpa (10/20°C) or -1.00Mpa (20/30°C) face a potential risk of C. pauciflorus invasion.
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