种子质量和植物原址环境相互作用,决定了沿海拔梯度的高山物种发芽模式

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Andrea Veselá, Tomáš Dostálek, Maan Bahadur Rokaya, Zuzana Münzbergová
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引用次数: 12

摘要

温度和降水状况的持续变化可能会对脆弱的生命史阶段(如发芽)产生强烈影响,尤其是在高山地区。物种和种群之间发芽模式的差异可能反映了它们对起源条件的适应,也可能由系统发育限制决定。然而,这两种影响很少是分开的。对来自喜马拉雅山不同海拔地区的14种凤仙花的40个种群进行了研究。模拟了三个家庭现场的温度,并根据气候变化情景使用了一个更温暖的温度。我们还研究了较短的分层和较暖的温度的综合影响,这是气候变化的另一个可能影响。母地和发芽条件的相互作用影响种子的总发芽率和发芽速度,但不影响种子的休眠。种子质量和原址条件的相互作用表明轻种子和重种子的发芽策略不同。只有种子质量受物种间系统发育关系的影响,而发芽反应(T30除外)主要受母地条件的驱动。这项研究首次表明,在气候变化的情况下,种子质量的影响与产地条件相互作用,决定了物种的发芽模式。因此,种子质量的差异可能对物种适应新条件的能力至关重要,因为与种子发芽模式不同,种子质量在系统发育方面受到强烈限制。需要进一步研究种子质量如何在不断变化的气候下改变物种的发芽,以证实这些发现的普遍性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Seed mass and plant home site environment interact to determine alpine species germination patterns along an elevation gradient

Seed mass and plant home site environment interact to determine alpine species germination patterns along an elevation gradient

Ongoing changes in temperature and precipitation regime may have a strong impact on vulnerable life-history stages such as germination, especially in alpine regions. Differences in germination patterns among species and populations may reflect their adaptation to conditions of their origin or may be determined by the phylogenetic constraints. These two effects are, however, rarely separated. All the germination patterns may also be modified by seed mass. We studied 40 populations of 14 species of Impatiens coming from different elevations in the Himalayas. Three home site temperatures were simulated and one warmer temperature according to a climate change scenario were used. We also studied the combined effect of shorter stratification and warmer temperature as another possible effect of climate change. Interactions of home site and germination conditions affected total germination and germination speed, but not seed dormancy. Seed mass and home site conditions’ interaction indicated different germination strategies in light and heavy seeds. Only seed mass was affected by phylogenetic relationships among the species, while germination response (except T30) was driven primarily by home site conditions. This study is the first to show that the effect of seed mass interacts with home site conditions in determining species’ germination patterns under changing climate. The differences in seed mass are thus likely crucial for species’ ability to adapt to novel conditions since seed mass, unlike seed germination patterns, is strongly phylogenetically constrained. Further studies exploring how seed mass modifies species’ germination under changing climate are needed to confirm generalisability of these findings.

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来源期刊
ACS Applied Bio Materials
ACS Applied Bio Materials Chemistry-Chemistry (all)
CiteScore
9.40
自引率
2.10%
发文量
464
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