Latitudinal pattern of flowering synchrony in an invasive wind-pollinated plant
Latitudinal pattern of flowering synchrony in an invasive wind-pollinated plant
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入侵风传粉植物开花同步的纬度模式
DOI：
10.1098/rspb.2018.1072
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Li Bo
中科院分区：
文献类型：
--
作者：
Qiu Shiyun;Xu Xiao;Liu Shuangshuang;Liu Wenwen;Liu Jing;Nie Ming;Shi Fuchen;Zhang Yihui;Weiner Jacob;Li Bo
开花同步性在植物繁殖成功中起着重要作用，而繁殖成功是入侵植物成功建立和传播的关键。尽管已发现开花同步性与气候因素密切相关，但这些因素沿纬度的变化对开花同步性的影响以及开花同步性在入侵种群生殖成功中的作用在很大程度上尚不清楚。在为期2年的野外研究中，我们研究了中国沿海入侵植物互花米草开花物候的纬向变异，特别是开花同步性，及其与种群种子在3个气候带的关系。结果表明，随着纬度的增加，初花期推迟，同步性增强。开花同步性与花期温度呈负相关，与土壤性质和降水无关，表明气候决定了开花同步性的纬向格局。此外，不同纬度的开花同步性与结实率之间的正相关表明，开花同步性可能在互花米草有性繁殖的纬度格局中起作用。这些结果表明，除了气候对入侵物种生长的影响外，气候因素还可以通过调节入侵植物的开花同步性而对入侵植物的繁殖成功起到重要作用。
Flowering synchrony can play an important role in plants' reproductive success, which is essential for the successful establishment and spread of invasive plants. Although flowering synchrony has been found to be closely related to climatic factors, the effects of variation in such factors along latitudinal gradient on flowering synchrony and the role of flowering synchrony in the reproductive success of invading populations remain largely unexplored. In a 2-year field study, we examined the latitudinal variation of flowering phenology, especially flowering synchrony, in an invasive plant, Spartina alterniflora, along coastal China, and its relationship with population seed set across three climatic zones. We found that first flowering date was delayed, and flowering synchrony increased with increasing latitude. Flowering synchrony was negatively related to temperature during flowering season but not to soil properties or precipitation, suggesting that climate has shaped the latitudinal pattern of flowering synchrony. Moreover, a positive correlation between flowering synchrony and seed set across latitudes indicates the possible role of flowering synchrony in the latitudinal pattern of sexual reproduction in S. alterniflora. These results suggest that, in addition to the effects of climate on the growth of invasive species, climatic factors can play an important role in the invasion success of alien plants by regulating the flowering synchrony and thus the reproductive success of invasive plants.