Developmental heat sum influences recalcitrant seed traits in Aesculus hippocastanum across Europe
Developmental heat sum influences recalcitrant seed traits in Aesculus hippocastanum across Europe
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DOI：
10.1111/j.1469-8137.2004.01012.x
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发表时间：
2004-04-01
期刊：
影响因子：
9.4
通讯作者：
Pritchard, HW
中科院分区：
文献类型：
--
作者：
Daws, MI;Lydall, E;Pritchard, HW
本研究以欧洲七叶树为材料，对沿着19度纬度的南北梯度的种子性状进行了分析。七叶树原产于希腊和巴尔干半岛，现已在欧洲各地引种。由于欧洲夏季气温随着纬度的增加而降低，我们检验了种子发育过程中的热量总和影响种子的物理、生理和生物学特性的假设。种子生理生化性状。来自希腊的种子（在自然范围内）的鲜质量是来自苏格兰（最北端的种子批）的五倍，并且轴含水量和溶质势较低。此外，希腊种子在较低的温度下发芽，更耐干燥。主成分分析（PCA）表明，所观察到的种子特征的模式是一致的和可预测的：一个单一的PCA轴解释了数据集中86.6%的变化。该轴强烈相关的热量总和积累的种子在development.The结果支持的概念，从更北的种子脱落不发达的结果，在发展过程中的温度较低，并提供了一个定量解释种内变异，这可能是其他物种的种子性状。
An analysis was made of seed traits along a north-south gradient spanning 19degrees of latitude in Europe using Aesculus hippocastanum, which originates from Greece and the Balkans and has been introduced throughout Europe.Because summer temperatures decrease with increasing latitude in Europe, we tested the hypothesis that the heat sum during seed development influences physical, physiological and biochemical seed traits.Seeds from Greece (within the natural range) had a fresh mass five times higher than those from Scotland (most northerly seed lot), and a lower axis moisture content and solute potential. In addition, Greek seeds germinated at cooler temperatures, and were more desiccation tolerant. Principal component analysis (PCA) showed that the observed patterns in seed characteristics were consistent and predictable: a single PCA axis explained 86.6% of the variation in the dataset. This axis correlated strongly with the heat sum accumulated by the seeds during development.The results support the notion that seeds from further north were shed less developed as a consequence of cooler temperatures during development, and provide a quantitative explanation for intraspecies variability in recalcitrant seed traits for this and, possibly, other species.