生命史策略是否决定了高山草本物种的花和叶的抗寒性?

IF 4.6 Q2 MATERIALS SCIENCE, BIOMATERIALS
Loreto V. Morales, Carla Alvear, Camila Sanfuentes, Alfredo Saldaña, Ángela Sierra-Almeida
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引用次数: 3

摘要

在高山栖息地,夏季霜冻事件会对植物的适应性产生负面影响。尽管如此,大多数研究都评估了霜冻对多年生植物营养结构的影响,对一年生植物的叶子和花朵都没有影响。我们假设一个物种的花和叶的抗冻性程度取决于其生命史策略(LHS),并且可能是生长/繁殖和抗冻性成本之间权衡的结果。具体来说,短命一年生植物的花和叶的抗寒性应该低于多年生植物的花。采用电解质渗漏法对智利中部安第斯山脉10种一年生和12种多年生植物的花和叶的抗冻性进行了比较。一年生物种50%组织(LT50)的温度损伤在花中为−9.6°C,在叶中为−11.9°C。在多年生物种中,花(−12.3°C)和叶(−12.5°C)的LT50相似。尽管如此,这些差异并不显著(一年生物种的花除外),但当逐物种分析抗寒性时,我们发现LHS之间存在显著差异。像这样,58%和83%的多年生物种都能抵抗温度 ≤ −其花和叶中的温度分别为10°C,而一年生物种的温度仅为30%和40%。此外,在大多数物种中,叶片的抗寒性高于花朵,一年生物种(58%)的这一比例高于多年生物种(43%)。因此,我们得出结论,抗冻性程度取决于LHS,因此与多年生物种相比,一年生物种的抗冻性较差,很少出现,并且分布仅限于高山栖息地的低海拔地区。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Does the life-history strategy determine the freezing resistance of flowers and leaves of alpine herbaceous species?

In high-mountain habitats, summer frost events can have negative consequences for plant fitness. Despite this, most studies have evaluated the consequences of frosts for vegetative structures of perennial plants, and neither for leaves nor for flowers of annual plants. We hypothesize that the degree of freezing resistance of flowers and leaves of a species depends on its life-history strategy (LHS), and is probably the consequence of a trade-off between growth/reproduction and the cost of the freezing resistance. Specifically, flowers and leaves of short-lived annual species should be less freezing resistant than those of perennial plant species. We compared the freezing resistance of flowers and leaves of 10 annual and 12 perennial plant species from the Andes of central Chile using the electrolyte leakage method. Temperature damage for 50% tissue (LT50) of annual species was − 9.6 °C in flowers and − 11.9 °C in leaves. In perennial species, LT50 was similar in flowers (− 12.3 °C) and leaves (− 12.5 °C). Despite that, these differences were not significant (except the flowers of annual species), we found remarkable differences between LHS when freezing resistance was analyzed species by species. Like this, 58% and 83% of perennial species resist temperatures ≤ − 10 °C in their flowers and leaves, respectively, compared with only 30% and 40% of annual species. Additionally, in most of the species, the freezing resistance of leaves was greater than that of flowers, with this proportion being greater in annual (58%) than in perennial species (43%). Thus, we concluded that the degree of freezing resistance depends on the LHS, such that annual species, which are less freezing resistant than perennial species, have an infrequent occurrence and a distribution restricted to low elevation in high-mountain habitats.

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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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