Beals Christopher, King Hannah, Bailey Ginger
Abraham Baldwin Agricultural College, 2802 Moore Highway, Tifton, GA, 37193, USA.
, 141 Ropemaker Ln., Savannah, GA, 31410, USA.
Environ Sci Pollut Res Int. 2023 May;30(21):59443-59448. doi: 10.1007/s11356-023-26697-9. Epub 2023 Apr 1.
We examined the effects of copper and lead on the antioxidant enzyme response of Alternanthera philoxeroides and Nasturtium officinale using a benchtop luminometer. Alternanthera philoxeroides is a nonnative invasive plant species that has spread throughout the wetland ecosystem in the southern part of the USA. Its invasion is facilitated by its ability to thrive in a wide range of abiotic conditions. Nasturtium officinale is an aquatic plant that is sensitive to relatively low amounts of pollution and is most commonly found in springs and shallow bodies of water. While A. philoxeroides tolerates organic pollution and heavy metals, N. officinale exhibits stress at low levels of pollution. Alternanthera philoxeroides antioxidant enzyme production was unaffected by increasing concentrations of both copper and lead. The antioxidant enzyme response of N. officinale showed a significant increase when plants were exposed to 10 and 25 ppm lead. Endogenous peroxidase concentrations of the control plants were also compared showing that A. philoxeroides possessed a significantly higher concentration of peroxidases than N. officinale. We hypothesize that a higher endogenous peroxidase concentration may be a mechanism that hyperaccumulator plants use to tolerate inhospitable concentrations of copper and lead.
我们使用台式发光计研究了铜和铅对空心莲子草和豆瓣菜抗氧化酶反应的影响。空心莲子草是一种外来入侵植物物种，已在美国南部的湿地生态系统中蔓延。它能够在广泛的非生物条件下茁壮成长，这促进了它的入侵。豆瓣菜是一种水生植物，对相对少量的污染敏感，最常见于泉水和浅水体中。虽然空心莲子草耐受有机污染和重金属，但豆瓣菜在低水平污染时就会表现出压力。空心莲子草抗氧化酶的产生不受铜和铅浓度增加的影响。当植物暴露于10 ppm和25 ppm的铅时，豆瓣菜的抗氧化酶反应显著增加。还比较了对照植物的内源性过氧化物酶浓度，结果表明空心莲子草的过氧化物酶浓度明显高于豆瓣菜。我们推测，较高的内源性过氧化物酶浓度可能是超积累植物用来耐受不适宜浓度的铜和铅的一种机制。
