高山物种的幼苗并不比低地物种的幼苗具有更好的抗冻性

IF 2.6 3区 生物学 Q2 PLANT SCIENCES
Sergey Rosbakh, Vera Margreiter, Bernardica Jelcic
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引用次数: 10

摘要

与成年植物相比,尽管霜冻被认为是限制高海拔地区植物招聘的主要因素之一,但人们对高山物种幼苗的抗冻性知之甚少。在这里,我们报道了九对具有低地(0–900 m a.s.l.)和高山(1800–2700 m a.s.l.)分布的同类物种的幼苗抗冻性的比较研究结果。与成年高山植物类似,我们预计高山物种的幼苗比低地植物更耐霜冻。在实验室条件下,通过将幼苗暴露于− 1至− 9°C,计算为50%的幼苗被霜冻致死的温度(LT50)。LT50值在− 1.95和− 6.11°C表明,所有测试物种的幼苗都有可能在轻度和/或短暂的霜冻中存活,但可能会因严重和/或持续的霜冻事件而受到致命损害。低地和高山物种的LT50值在统计上没有差异,平均为− 3.96 ± 0.18°C和− 4.16 ± 分别为0.43°C。这些发现并没有证实我们的假设,即高山物种的幼苗比低地物种的幼苗具有更高的抗冻性。四个可能的原因可以解释这种模式。它们包括(1)低地和高山栖息地的负胁迫水平相当,(2)高山植物的机会种子发芽策略,(3)我们实验设置的特点,以及(4)干旱对高山幼苗存活的潜在影响比霜冻更强。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seedlings of alpine species do not have better frost-tolerance than their lowland counterparts

In contrast to adult plants, little is known about the frost-tolerance of seedlings of alpine species, despite the fact that frost has been considered as one of the main factors limiting plant recruitment in high elevation. Here we report the results of a comparative study on seedling frost-tolerance of nine congeneric species pairs with lowland (0–900 m a.s.l.) and alpine (1800–2700 m a.s.l.) distribution. Similarly to adult alpine plants, we expected seedlings of alpine species to be more frost-tolerant than their lowland counterparts. Frost-tolerance was estimated under laboratory conditions by exposing seedlings to frost events from − 1 to − 9 °C, calculated as the temperature at which 50% of the seedlings were lethally damaged by frost (LT50). The LT50 values varied between − 1.95 and − 6.11 °C suggesting that seedling of all tested species could potentially survive mild and/or short frosts, but might be lethally damaged by severe and/or continuous frost events. The LT50 values for lowland and alpine species did not differ statistically and were on average − 3.96 ± 0.18 °C and − 4.16 ± 0.43 °C, respectively. These findings did not confirm our hypothesis that seedlings of alpine species have higher frost-tolerance than seedlings of lowland species. Four possible reasons could explain this pattern. They include (1) comparable levels of negative-stress in both lowland and alpine habitats, (2) opportunistic seed germination strategy in alpine plants, (3) peculiarities of our experimental set up and (4) potentially stronger effects of drought on alpine seedling survival than frost.

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来源期刊
Alpine Botany
Alpine Botany PLANT SCIENCES-
CiteScore
5.10
自引率
18.50%
发文量
15
审稿时长
>12 weeks
期刊介绍: Alpine Botany is an international journal providing a forum for plant science studies at high elevation with links to fungal and microbial ecology, including vegetation and flora of mountain regions worldwide.
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