Seed high-temperature sensitivity and germination ecology in intermediate seeds of three species from Xishuangbanna, tropical China
Seed high-temperature sensitivity and germination ecology in intermediate seeds of three species from Xishuangbanna, tropical China
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DOI：
10.1007/s11258-023-01331-3
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发表时间：
2023-06
期刊：
影响因子：
1.7
通讯作者：
Xuejiao An;Lan Yang;B. Wen;Ligang Chen
中科院分区：
文献类型：
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作者：
Xuejiao An;Lan Yang;B. Wen;Ligang Chen
植物入侵导致热带雨林植物区系组成的变化，以及结构和功能的退化，这是由全球变化，森林砍伐和栖息地破碎化驱动的，温度升高是热带雨林残留物的一个显著特征。在这里，我们假设小气候变化，特别是温度升高，是植物入侵热带雨林的主要驱动力。采用室内和田间试验相结合的方法，对我国热带西双版纳地区栽培的阴香（Cinnamomum burmanni）、柑橘（Citrus maxima）和咖啡（Coffea arabica）3种非原产植物中间种子的萌发生态和耐高温性进行了研究。结果表明，所有种子均表现出对高温的敏感性，包括在≥ 35 °C或40 °C每日暖期≥ 9 h条件下萌发率低，在40 °C连续加热≥ 4 d或≥ 50 °C加热30 min后生活力丧失，但种间差异较大。同时，这些物种表现出强烈的偏好森林生境的植物从种子再生，包括较高的发芽率和较长的种子和幼苗存活在森林条件下。总体而言，中间种子的高温敏感性，接近或略低于柠檬种子，但显着高于正统种子的先驱和杂草种以前报道的。结果表明，阴香、柑橘和咖啡都具有进入西双版纳热带雨林的潜力。
Plant invasion causes changes in floristic composition, and structural and functional degradation of tropical rainforest, which is driven by global changes, deforestation and habitat fragmentation, with temperature increasing as a marked trait in rainforest remnants. Here, we hypothesized that microclimate change, particularly increased temperature, is a major driver for plant invasion to tropical rainforest. Laboratory and field experiments were designed to investigate the germination ecology and high-temperature tolerance of intermediate seeds from three species:Cinnamomum burmanni,Citrus maxima, andCoffea arabica, which are cultivated in Xishuangbanna, tropical China though not native. It was found that the seeds all exhibited sensitivity to high-temperature, including low germination when incubated at ≥ 35 °C or ≥ 9 h daily warm period at 40 °C, and viability loss after ≥ 4 d continuous heating at 40 °C or 30-min heating at temperature ≥ 50 °C, although with interspecific variations. Meanwhile, these species demonstrated a strong preference for forest habitats during plant regeneration from seeds, including higher germination percentage and longer seeds and seedling survival under forest conditions. Overall, intermediate seeds had high-temperature sensitivity, close to or slightly lower than recalcitrant seeds, but markedly higher than orthodox seeds of pioneer and weed species previously reported. We suggest thatCinnamomum burmanni,Citrus maxima, andCoffea arabicaall have the potential to enter Xishuangbanna tropical rainforests.