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- Title
Response and recovery of rice ( Oryza sativa) seedlings to irrigation with microcystin-contaminated water.
- Authors
Liang, Chanjuan; Wang, Weimin
- Abstract
Irrigation with microcystin-contaminated water threatens plant growth and human health. We studied the accumulation of microcystins, growth, and photosynthesis in rice exposed to different concentrations microcystins (0, 1, 100, 1,000, and 3,000 μg L) for 7 days and then without microcystins for 7 days. After a 7-day exposure, the accumulation of microcystins in roots was the highest. High concentration microcystins (≥100 μg L) inhibited growth, and decreased photosynthetic rate and chlorophyll content. The decrease was positively correlated with microcystins concentrations. After a 7-day restoration, the accumulation of microcystins in organs was lower than that during the exposure period. The dry weight of roots and leaves in rice seedlings treated with 100 μg L was not significantly different from those of the control, although photosynthetic rate and chlorophyll content in rice seedlings treated with 100 μg L were still lower than those of the control. However, growth and photosynthesis in rice seedlings treated with 1,000 or 3,000 μg L microcystins were still lower than those of the control, even worse than those during the exposure period, indicating an irreversible inhibition of microcystins to plants at high concentrations of microcystins. Our results imply that irrigation with microcystin-contaminated water must be monitored and controlled to avoid harmful accumulation of microcystins and damage to plant growth.
- Subjects
RICE microbiology; PLANT growth &; the environment; MICROCYSTIS; PHOTOSYNTHESIS; WATER pollution; RICE field irrigation; RICE seeds
- Publication
Environmental Earth Sciences, 2015, Vol 73, Issue 8, p4573
- ISSN
1866-6280
- Publication type
Article
- DOI
10.1007/s12665-014-3746-z