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首页> 外文期刊>Seed Science Research >Taiwanese montane Sambucus chinensis seeds require warm stratification, contrasting with other congeneric temperate members.
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Taiwanese montane Sambucus chinensis seeds require warm stratification, contrasting with other congeneric temperate members.

机译：与其他同类的温带成员相比，台湾山地山楂（Sambucus chinensis）种子需要温暖的分层。

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摘要

Many temperate plant genera, like Sambucus, have species with range disjunctions among North America, Europe and/or Asia. Cold stratification (sometimes in combination with warm stratification) is the primary mechanism to break seed dormancy in these species. For some of these genera showing Northern Hemispheric disjunctions, members also occur in subtropical or tropical regions, mostly confined to higher elevations where climate and vegetation differ from those in northern latitudes. We made two hypotheses concerning germination for the subtropical Taiwanese Sambucus chinensis: (1) seeds from populations exposed to warm temperatures would require warm stratification, and (2) seeds from populations exposed to cold temperatures need cold stratification. We investigated the germination (including embryo growth) of non-stratified seeds over a range of temperatures and tested the effects of cold stratification and of gibberellins GA 3 and GA 4 on germination. The amount and timing of germination among populations varied substantially in response to temperature treatments. Seeds from all populations of this species required warm temperatures for dormancy break and germination, regardless of environmental conditions. As such, the majority of seeds had non-deep simple morphophysiological dormancy, which, until now, has not been reported in any members of Sambucus. The seed characteristics of the subtropical S. chinensis are different from those of temperate members of the genus in which cold stratification is the predominate treatment to overcome dormancy.
机译：许多温带植物属，如接骨木（Sambucus），在北美，欧洲和/或亚洲之间的分布范围有所不同。冷分层（有时与热分层结合）是打破这些物种种子休眠的主要机制。对于其中某些属北半球分离的属，其成员也出现在亚热带或热带地区，主要限于气候和植被不同于北部纬度的更高海拔地区。对于亚热带台湾中华接骨木的萌发，我们做出了两个假设：（1）暴露于温暖温度下的种群的种子需要进行热分层，（2）暴露于寒冷温度下的种群的种子需要进行冷分层。我们研究了非分层种子在一定温度范围内的萌发（包括胚胎生长），并测试了冷分层以及赤霉素GA 3和GA 4对发芽的影响。群体中发芽的数量和时间根据温度处理而有很大不同。无论环境条件如何，该物种所有种群的种子都需要温暖的温度才能休眠和发芽。因此，大多数种子具有非深层的简单形态生理休眠，迄今为止，尚未在接骨木的任何成员中报道。亚热带沙棘的种子特性不同于温带属的种子，其中冷分层是克服休眠的主要处理方法。

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