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首页> 外文期刊>Oecologia >Ultraviolet-B-induced DNA damage and ultraviolet-B tolerance mechanisms in species with different functional groups coexisting in subalpine moorlands
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Ultraviolet-B-induced DNA damage and ultraviolet-B tolerance mechanisms in species with different functional groups coexisting in subalpine moorlands

机译：亚高山高地共存具有不同官能团的物种的紫外线B诱导的DNA损伤和紫外线B耐受机制

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摘要

High doses of ultraviolet-B (UV-B; 280-315 nm) radiation can have detrimental effects on plants, and especially damage their DNA. Plants have DNA repair and protection mechanisms to prevent UV-B damage. However, it remains unclear how DNA damage and tolerance mechanisms vary among field species. We studied DNA damage and tolerance mechanisms in 26 species with different functional groups coexisting in two moorlands at two elevations. We collected current-year leaves in July and August, and determined accumulation of cyclobutane pyrimidine dimer (CPD) as UV-B damage and photorepair activity (PRA) and concentrations of UV-absorbing compounds (UACs) and carotenoids (CARs) as UV-B tolerance mechanisms. DNA damage was greater in dicot than in monocot species, and higher in herbaceous than in woody species. Evergreen species accumulated more CPDs than deciduous species. PRA was higher in Poaceae than in species of other families. UACs were significantly higher in woody than in herbaceous species. The CPD level was not explained by the mechanisms across species, but was significantly related to PRA and UACs when we ignored species with low CPD, PRA and UACs, implying the presence of another effective tolerance mechanism. UACs were correlated negatively with PRA and positively with CARs. Our results revealed that UV-induced DNA damage significantly varies among native species, and this variation is related to functional groups. DNA repair, rather than UV-B protection, dominates in UV-B tolerance in the field. Our findings also suggest that UV-B tolerance mechanisms vary among species under evolutionary trade-off and synergism.
机译：高剂量的紫外线B（UV-B; 280-315 nm）辐射可能对植物产生有害影响，尤其是损害其DNA。植物具有DNA修复和保护机制，可防止UV-B破坏。但是，尚不清楚田间物种之间的DNA损伤和耐受机制如何变化。我们研究了在两个高地的两个高地上共存的具有不同功能组的26种物种的DNA损伤和耐受机制。我们在7月和8月收集了当年的叶子，并确定了环丁烷嘧啶二聚体（CPD）的积累作为UV-B损伤和光修复活性（PRA）以及UV吸收化合物（UAC）和类胡萝卜素（CARs）的浓度作为UV- B耐受机制。双子叶植物的DNA损伤大于单子叶植物，DNA的损害大于木本。常绿树种比落叶树种积累了更多的CPD。禾本科中的PRA高于其他家族的PRA。木本植物中的UAC明显高于草本植物。 CPD水平不能由跨物种的机制来解释，但是当我们忽略具有低CPD，PRA和UAC的物种时，它与PRA和UAC显着相关，这意味着存在另一种有效的耐受机制。 UAC与PRA负相关，与CARs正相关。我们的结果表明，紫外线诱导的DNA损伤在天然物种之间存在显着差异，并且这种差异与官能团有关。 DNA修复而不是UV-B保护在该领域对UV-B的耐受性占主导地位。我们的发现还表明，在进化折衷和协同作用下，物种对UV-B的耐受机制各不相同。

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