Latitudinal and Longitudinal Trends of Seed Traits Indicate Adaptive Strategies of an Invasive Plant.
Latitudinal and Longitudinal Trends of Seed Traits Indicate Adaptive Strategies of an Invasive Plant.
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DOI：
10.3389/fpls.2021.657813
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发表时间：
2021
影响因子：
5.6
通讯作者：
Ding J
中科院分区：
文献类型：
--
作者：
Zhou L;Yu H;Yang K;Chen L;Yin W;Ding J
入侵植物可能会改变其种子性状以适应环境并促进其生长。研究一种入侵植物在不同纬度/经度种群间的种子性状变异，有助于揭示入侵植物如何应对气候变化。本研究采集了全球入侵植物蒿属（Ambrosia artemisiifolia） 26个居群的种子，分布在23°纬度和20°经度高度相关的中国地区。我们测量了20多个种子性状，包括种子形态、植物激素、营养成分和发芽，并研究了沿纬度的气候如何影响这些性状。我们发现，随着纬度和经度的增加，萌发时间明显延迟，而萌发率则相反。从低纬度到高纬度，种子大小、脱落酸和脂肪酸增加，可能影响种子萌发。我们的分析进一步表明，温度是种子性状和萌发变异的主要驱动因素。寒冷地区较大种子的萌发率较低，而温暖地区较小种子的萌发率较快，这可能表明入侵植物在种子性状功能生态方面的适应策略。总之，我们的研究结果为理解种子在入侵过程中的适应策略及其潜在的生理生化机制提供了新的见解。
Invasive plants may change their seed traits to adapt to the environment and facilitate their performance. Studies on variation in seed traits among populations of an invader along latitudes/longitudes may assist in revealing how invasive plants cope with variable climates. In this study, we collected seeds of 26 populations of the global invasive plant Ambrosia artemisiifolia along ranges spanning 23° latitudes and 20° longitudes that are highly correlated in its invasive range in China. We measured over 20 seed traits, including seed morphology, phytohormone, nutrients, and germination, and investigated how the climate along the latitudes affects those traits. We found that germination time was significantly delayed with increasing latitude and longitude, while the reversed patterns were true for the germination rate. From low to high latitude, seed size, abscisic acid, and fatty acid were increased, likely affecting seed germination. Our analysis further demonstrated that temperature is the dominant driver of the variability in seed traits and germination. Germination rates of larger seeds in cold ranges were lower, while smaller seeds from warm ranges germinated faster, likely indicating adaptive strategies of the invasive plant in seed trait functional ecology. Together, our findings provide new insights into understanding the seed adaptation strategies during the invasion process and the underlying physiological and biochemical mechanisms involved.
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