加那利松幼苗在低温和冰冻温度下的表型可塑性

IF 2.7 3区 农林科学 Q2 ECOLOGY
José Carlos Miranda, Unai López de Heredia, Victoria Fernández, Pilar Pita
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引用次数: 0

摘要

全球变化正在影响霜冻事件的频率和时间分布。我们可以预期,低温造成的损害会增加,特别是在物种海拔范围的上限。在此,我们评估了来自不同岛屿和海拔的加那利松2年树苗对低温和冰冻温度的不同反应。将6个群体的幼苗分别在温室(温度≤5℃,低温条件)和室外(温度≤- 3.3℃,低温条件)培养104天。其中一个种群的幼苗属于三个半同胞家庭。在整个研究过程中,测定了4次光系统II的最大量子产率和蒸散量(ETP)。所有种群在冷冻条件下均有光抑制,而在低温条件下无光抑制。在寒冷和冰冻条件下,在最温暖和最干燥的环境和海拔最低(250米)的种群中,我们测量了最低的ETP。海拔较高的3个种群在低温条件下ETP最高,这可能是对植被期缩短的适应。海拔对其他参数的影响仍然难以捉摸,这可能部分归因于较高的种群内变异性。室外生长的植物表皮蜡浓度升高,针叶含水量降低。除受冷脱水影响最严重的种群外,其余种群在冷冻条件下均表现出渗透调节和组织弹性降低的现象。在海拔最高的地区(2,241 m),这种反应更为强烈。我们的研究结果强调了适应过程、遗传变异和可塑性调节共存于该物种对低温的反应中。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Phenotypic plasticity in Pinus canariensis seedlings growing at chilling and freezing temperatures
Global change is affecting the frequency and temporal distribution of frost events. We can expect damage caused by low temperatures to increase specially at the upper limit of a species’ elevation range. Here, we assessed how Pinus canariensis two-year old seedlings from different islands and elevations responded differently to chilling and freezing temperatures. Seedlings from six populations were grown either in a greenhouse (t min = 5 ̊C, chilling conditions) or outdoors (t min = −3.3 ̊C, freezing conditions) for 104 days in winter. Seedlings from one of these populations belonged to three half-sib families. Maximum quantum yield of Photosystem II and evapotranspiration (ETP) were determined four times throughout the study. All populations suffered photoinhibition under freezing but not under chilling conditions. We measured the lowest ETP in the population from the warmest and driest environment and lowest elevation (250 m) both under chilling and freezing conditions. The three populations from the higher elevations reached the highest ETP under chilling, a likely adaptation to the shortening of the vegetative period. The effect of elevation remained elusive for other parameters, which could be partly attributed to high intrapopulation variability. Epicuticular wax concentration increased and needle water content decreased in plants growing outdoors. All populations except the one most affected by cold dehydration showed osmotic adjustment and a simultaneous decrease in tissue elasticity under freezing. This response was stronger in the population from the highest elevation (2,241 m). Our results highlight the coexistence of adaptive processes, genetic variation and plasticity conditioning the response to low temperatures in this species.
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来源期刊
CiteScore
4.50
自引率
6.20%
发文量
256
审稿时长
12 weeks
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