Acclimation of photosynthetic capacity and foliar respiration in Andean tree species to temperature change.
Acclimation of photosynthetic capacity and foliar respiration in Andean tree species to temperature change.
复制标题
安第斯树种光合能力和叶呼吸对温度变化的适应。
DOI：
10.1111/nph.18900
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Cox AJF
中科院分区：
文献类型：
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作者：
Cox AJF
气候变暖正在导致安第斯热带山地森林（TMF）的成分发生变化。假设这些变化是由于寒冷和温暖相关物种对变暖的不同反应造成的，前者死亡，后者向上迁移。安第斯TMF的热适应潜力仍然未知。沿着2000米的安第斯海拔梯度，我们种植了寒冷和温暖附属物种的个体（在普通土壤和灌溉下），分别将它们暴露于其热生态位的极端炎热和寒冷。我们测量了种植后 5 个月净光合作用 (Anet)、光合能力和叶片暗呼吸 (Rdark) 对变暖/变冷的响应。在所有物种中，在最接近其热均值的生长温度 (Tg) 下生长时，Anet 和 25°C 时的光合能力最高，在冷性和暖性物种中分别随着变暖和变冷而下降。当在Tg表达时，冷亲缘物种的光合能力和Rdark保持不变，但在暖亲缘物种中后者下降。所有物种的Rdarkat 25°C随着温度的升高而增加，但在Tg表达时保持不变。两个物种组都适应了温度，但只有暖亲缘物种降低了Rdark与光合能力比，在Tgas温度增加。这可能会给他们在未来变暖的情况下带来竞争优势。
Climate warming is causing compositional changes in Andean tropical montane forests (TMFs). These shifts are hypothesised to result from differential responses to warming of cold‐ and warm‐affiliated species, with the former experiencing mortality and the latter migrating upslope. The thermal acclimation potential of Andean TMFs remains unknown.Along a 2000 m Andean altitudinal gradient, we planted individuals of cold‐ and warm‐affiliated species (under common soil and irrigation), exposing them to the hot and cold extremes of their thermal niches, respectively. We measured the response of net photosynthesis (Anet), photosynthetic capacity and leaf dark respiration (Rdark) to warming/cooling, 5 months after planting.In all species,Anetand photosynthetic capacity at 25°C were highest when growing at growth temperatures (Tg) closest to their thermal means, declining with warming and cooling in cold‐affiliated and warm‐affiliated species, respectively. When expressed atTg, photosynthetic capacity andRdarkremained unchanged in cold‐affiliated species, but the latter decreased in warm‐affiliated counterparts.Rdarkat 25°C increased with temperature in all species, but remained unchanged when expressed atTg.Both species groups acclimated to temperature, but only warm‐affiliated species decreasedRdarkto photosynthetic capacity ratio atTgas temperature increased. This could confer them a competitive advantage under future warming.