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首页> 外文期刊>Seed Science Research >Dose-response of germinating Rudbeckia mollis (Asteraceae) seeds exposed to various thermal scenarios
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Dose-response of germinating Rudbeckia mollis (Asteraceae) seeds exposed to various thermal scenarios

机译：暴露于各种热环境下发芽的黄金菊（菊科）种子的剂量响应

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摘要

Temperature is a key environmental signal regulating germination. A thorough understanding of how seed populations respond to various temperatures can inform end-users regarding effective establishment strategies and forms the basis for questions related to a taxon's thermo-biology. Although abundant information exists regarding germination responses of economically important crops to several temperature scenarios, much less is known concerning the seed biology of wild germplasm. To address this, we examined the germination response of non-dormant Rudbeckia mollis seeds to various doses of constant or simulated seasonal diel temperatures. Germination response was sigmoidal. Seeds of R. mollis were capable of germinating within a few days to high percentages (> 95%) at relatively cool constant (15-25 degrees C) or 12-hour alternating (22/11-33/24 degrees C) temperatures, with optimum temperatures for germination occurring at 25 degrees C or 29/19 degrees C. Germination was inhibited as temperatures increased to 30 degrees C or 33/24 degrees C with early and late germinating phenotypes displaying differential responses at these temperatures. No germination occurred at 35 degrees C. Results are discussed in terms of seedling establishment of R. mollis outside its natural range and implications of climate change on germination.
机译：温度是调节发芽的关键环境信号。对种子种群如何应对各种温度的透彻了解可以使最终用户了解有效的建立策略，并为与分类单元的热生物学有关的问题奠定基础。尽管存在关于重要经济作物对几种温度情况的萌发反应的丰富信息，但对于野生种质的种子生物学知之甚少。为了解决这个问题，我们研究了非休眠黄金菊对不同剂量的恒定或模拟季节性diel温度的萌发响应。发芽反应为S形。软体动物的种子能够在相对凉爽的恒定温度（15-25摄氏度）或12小时交替温度（22 / 11-33 / 24摄氏度）下几天内萌发成高百分比（> 95％），最佳发芽温度发生在25摄氏度或29/19摄氏度。随着温度升高至30摄氏度或33/24摄氏度，发芽受到抑制，早期和晚期发芽表型在这些温度下表现出不同的响应。在35摄氏度下未发生发芽。讨论了在自然界以外的软体树幼苗的结实以及气候变化对发芽的影响。

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