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Born to revive: molecular and physiological mechanisms of double tolerance in a paleotropical and resurrection plant.
New Phytologist ( IF 8.3 ) Pub Date : 2020-02-03 , DOI: 10.1111/nph.16464
Beatriz Fernández-Marín 1, 2 , Miquel Nadal 3 , Jorge Gago 3 , Alisdair R Fernie 4 , Marina López-Pozo 1 , Unai Artetxe 1 , José Ignacio García-Plazaola 1 , Amy Verhoeven 1, 5
Affiliation  

•Resurrection plants recover physiological functions after complete desiccation. Almost all of them are native to tropical warm environments. The Gesneriaceae though, includes four genera, remnant of the past paleotropical flora, which inhabit temperate mountains. One of these species is additionally freezing-tolerant: Ramonda myconi. We hypothesise that this species has been able to persist in a colder climate thanks to some resurrection-linked traits. •To disentangle the physiological mechanisms underpinning multi-stress tolerance to desiccation and freezing, we conducted an exhaustive seasonal assessment of photosynthesis (gas exchange, limitations partitioning, photochemistry and galactolipids), and primary metabolism (through metabolomics) in two natural populations at different elevations. •R. myconi displayed low rates of photosynthesis, largely due to mesophyll limitation. However, plants were photosynthetically active throughout the year excluding a reversible desiccation period. Common responses to desiccation and low-temperature involved chloroplast protection: enhanced thermal energy dissipation, higher carotenoid to chlorophyll ratio and de-epoxidation of xanthophyll cycle. As specific responses, antioxidants and secondary metabolic routes rose upon desiccation, while putrescine, proline and a variety of sugars rose in winter. •Our data suggest conserved mechanisms to cope with photo-oxidation during desiccation and cold events, while additional metabolic mechanisms may have evolved as specific adaptations to cold during recent glaciations.

中文翻译:

为复兴而生:古生物学和复活植物中双重耐受的分子和生理机制。

•复活植物在完全干燥后恢复了生理功能。它们几乎都是热带温暖环境的原生植物。但是,苦苣苔科包括四个属,它们是过去古气候植物群的残留物,栖息在温带山脉中。这些物种之一还具有耐冷冻性:Ramonda myconi。我们假设,由于一些与复活有关的特性,该物种已经能够在较冷的气候下生存。•为弄清支撑干旱和冷冻多应力耐受性的生理机制,我们对两个海拔高度不同的自然种群进行了光合作用(气体交换,限制分配,光化学和半乳糖脂)和主要代谢(通过代谢组学)的详尽的季节性评估。•R。myconi显示出低的光合作用速率,主要是由于叶肉的限制。但是,除可逆的干燥期外,植物全年都具有光合活性。对干燥和低温的常见反应包括叶绿体保护:增强的热能耗散,更高的类胡萝卜素与叶绿素的比率以及叶黄素循环的脱环氧化作用。作为特异性反应,抗氧化剂和二级代谢途径在干燥时增加,而腐胺,脯氨酸和各种糖类在冬季增加。•我们的数据表明,在干旱和寒冷事件期间,应对光氧化的机制较为保守,而在最近的冰期中,其他代谢机制可能已随着对寒冷的特定适应而发展。除可逆的干燥期外,全年的植物都具有光合活性。对干燥和低温的常见反应涉及叶绿体保护:增强的热能耗散,更高的类胡萝卜素与叶绿素的比率以及叶黄素循环的脱环氧化作用。作为特异性反应,抗氧化剂和二级代谢途径在干燥时增加,而腐胺,脯氨酸和各种糖类在冬季增加。•我们的数据表明,在干旱和寒冷事件期间,应对光氧化的机制较为保守,而在最近的冰期中,其他代谢机制可能已经发展为对寒冷的特殊适应。除可逆的干燥期外,全年的植物都具有光合活性。对干燥和低温的常见反应包括叶绿体保护:增强的热能耗散,更高的类胡萝卜素与叶绿素的比率以及叶黄素循环的脱环氧化作用。作为特异性反应,抗氧化剂和二级代谢途径在干燥时增加,而腐胺,脯氨酸和各种糖类在冬季增加。•我们的数据表明,在干旱和寒冷事件期间,应对光氧化的机制较为保守,而在最近的冰期中,其他代谢机制可能已经发展为对寒冷的特殊适应。类胡萝卜素与叶绿素的比例更高,叶黄素循环脱环氧化。作为特异性反应,抗氧化剂和二级代谢途径在干燥时增加,而腐胺,脯氨酸和各种糖类在冬季增加。•我们的数据表明,在干旱和寒冷事件期间,应对光氧化的机制较为保守,而在最近的冰期中,其他代谢机制可能已经发展为对寒冷的特殊适应。类胡萝卜素与叶绿素的比例更高,叶黄素循环脱环。作为特异性反应,抗氧化剂和二级代谢途径在干燥时增加,而腐胺,脯氨酸和各种糖类在冬季增加。•我们的数据表明,在干旱和寒冷事件期间,应对光氧化的机制较为保守,而在最近的冰期中,其他代谢机制可能已经发展为对寒冷的特殊适应。
更新日期:2020-03-26
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