Ascorbate: A Biomarker of Herbicide Stress in Wetland Plants
In laboratory exposures of wetland plants to low herbicide levels (<0.1 μg/mL), some plants showed increased total ascorbic acid suggesting a stimulatory effect on ascorbic acid synthesis occurred; at higher herbicide concentrations (≥0.1 μg/mL) a notable decline in total ascorbic acid and increase in the oxidized form, dehydroascorbic acid occurred. Vigna luteola and Sesbania vesicaria were exposed for 7 and 21 days respectively to atrazine (0.05 to 1 μg/mL); Spartina alterniflora 28 days at 0.1 μg/mL trifluralin; Hibiscus moscheutos 14 days at 0.1 and 1 μg/mL metolachlor in fresh and brackish water. The greatest increase following low dosage occurred with S. alterniflora, increasing from <600 μg/g wet wt. total ascorbic acid to >1000 μg/g. Ascorbic acid may be a promising biomarker of estuarine plants exposed to herbicide runoff; stimulation of ascorbic acid synthesis may enable some wetland plants used in phytoremediation to cope with low levels of these compounds.
ACS Symposium Series
(1997). Ascorbate: A Biomarker of Herbicide Stress in Wetland Plants. ACS Symposium Series, 664, 106-113.
Available at: https://aquila.usm.edu/fac_pubs/5196