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首页> 外文期刊>Environmental toxicology and chemistry >FITNESS TRADE-OFFS OF SELENASTRUM CAPRICORNUTUM STRAINS SELECTED FOR RAPID GROWTH ON COPPER-SPIKED SOLIDIFIED NUTRIENT MEDIUM
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FITNESS TRADE-OFFS OF SELENASTRUM CAPRICORNUTUM STRAINS SELECTED FOR RAPID GROWTH ON COPPER-SPIKED SOLIDIFIED NUTRIENT MEDIUM

机译：铜质固溶养分培养基上快速生长所选择的海藻毛状体的健身权衡

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摘要

Stock (ancestral) cultures of Selenastrum capricornutum grew optimally in low Cu liquid nutrient medium (LNM) containing 0.004 μg L~(-1) Cu~(2+). Growth of stock cultures was optimized on low Cu solidified nutrient medium (SNM) containing 20 μg L~(-1) Cu~(2+). Cell strains (clones) were isolated from unusually large colonies on high Cu SNM (1,000 μg L~(-1) Cu~(2+)). Most isolated strains performed the same as ancestral populations in high Cu LNM (50 μg L~(-1) Cu~(2+)), but three strains grew more slowly. These "variant strains" were Cu tolerant on SNM (equal growth with low and high Cu) and produced larger colonies than did the ancestral population on both low and high Cu SNM. In contrast, colonies from ancestral cell samples grew more slowly in high versus low Cu SNM. No significant growth differences were observed between ancestral populations and variant strains in low Cu LNM, suggesting low fixed costs of adaptation to SNM. However, slower growth of variant strains in high Cu LNM constituted a fitness trade-off associated with adaptation. Rapid adaptation to pollution may often result in important biological trade-offs even when costs of adaptive mechanisms are low.
机译：七叶硒的原始（祖传）培养物在含有0.004μgL〜（-1）Cu〜（2+）的低铜液体营养培养基（LNM）中生长最佳。在含有20μgL〜（-1）Cu〜（2+）的低铜固化营养培养基（SNM）上优化原种培养物的生长。在高Cu SNM（1,000μgL〜（-1）Cu〜（2+））上从异常大的菌落中分离出细胞株（克隆）。在高Cu LNM（50μgL〜（-1）Cu〜（2+））中，大多数分离出的菌株与祖先种群表现相同，但三种菌株生长较慢。这些“变异株”对SNM具有铜耐受性（低和高Cu均等生长），并且比低和高Cu SNM上的祖先群体产生更大的菌落。相比之下，祖先细胞样品中的菌落在高Cu SNM中生长较慢。在低铜LNM中，祖先种群和变异株之间没有观察到明显的生长差异，这表明适应SNM的固定成本较低。但是，高Cu LNM中变异菌株的生长较慢，这构成了适应性折衷。即使适应机制的成本很低，对污染的快速适应也可能经常导致重要的生物学折衷。

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