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Seed dormancy and germination of Asarum sieboldii, a disjunct relict species in East Asia
Plant Biology ( IF 4.2 ) Pub Date : 2020-12-02 , DOI: 10.1111/plb.13224 Y. H. Rhie 1 , S. Y. Lee 2 , J. L. Walck 3 , S. N. Hidayati 3
中文翻译：
东亚不同遗迹种细叶细辛的种子休眠和萌发
更新日期：2020-12-02
Plant Biology ( IF 4.2 ) Pub Date : 2020-12-02 , DOI: 10.1111/plb.13224 Y. H. Rhie 1 , S. Y. Lee 2 , J. L. Walck 3 , S. N. Hidayati 3
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- Disjunct species in the same genus are a common feature of the flora in the temperate forests of East Asia and eastern North America. This study aimed to evaluate whether the kind of seed dormancy was maintained after species in the genus Asarum (Aristolochiaceae) were separated from their common ancestor.
- We classified the seed dormancy of Asarum sieboldii, an East Asian species, based on a phenology study and experiments in controlled temperature conditions, and then compared it to that of the previously studied A. canadense, an eastern North American species.
- The underdeveloped embryo of A. sieboldii grew and germinated (radicle emergence) in autumn but shoot emergence did not occur until the following spring. The seeds of A. sieboldii had deep simple epicotyl morphophysiological dormancy because the seeds with emerged radicle required a relatively long period of cold stratification to break epicotyl dormancy and produce a shoot.
- Although the seed of A. sieboldii had weaker radicle dormancy and stronger epicotyl dormancy compared to A. canadense, the kind of seed dormancy was the same for the two species. The trait of seed dormancy was inherited from a shared common ancestor and maintained in populations well after the two species (or their ancestors) separated. However, quantitative differences in temperature requirements for radicle and shoot emergence suggest the possibility of adaptation to the environment.
中文翻译：
东亚不同遗迹种细叶细辛的种子休眠和萌发
- 同一属中的杂种是东亚和北美洲东部温带森林中植物区系的共同特征。本研究旨在评估细辛属（Aristolochiaceae）中的物种与其共同祖先分离后是否保持了种子休眠的种类。
- 我们根据物候研究和在可控温度条件下进行的实验，对东亚细辛细辛细辛的种子休眠进行了分类，然后将其与北美东部的先前种A. canadense进行了比较。
- 秋季未发育的A. sieboldii胚生长并发芽（胚芽出苗），但直到第二年春天才出现芽出苗。sieboldii的种子具有较深的简单上胚层形态生理休眠，这是因为具有胚根的种子需要较长的冷分层时间才能打破上胚层休眠并产生枝条。
- 尽管与加拿大念珠菌相比，西伯利亚盲。的种子具有较小的胚根休眠性和较强的上胚轴休眠性，但这两种物种的种子休眠类型相同。种子休眠的特性是从一个共同的祖先继承而来的，并且在两个物种（或其祖先）分离后很好地保留在种群中。然而，胚根和芽出苗的温度要求在数量上的差异表明适应环境的可能性。
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