PJB-2018-1724
Isoetes sinensis: a rare and endangered species, can absorb and accumulate lead (Pb)
Wei Wang, Chun-Ye Li, Bao-Dong Liu, Li Wang, Chun-Yu Chi and Guo-Hua Ding
Abstract
Isoetes sinensis Palmer (Isoetaceae) is listed as a Wild Plant of National Protection Grade I for its endangered status. The limited population of I. sinensis is thought to be caused by difficulty breeding and habitat pollution (especially heavy metal pollution). This research used a lead nitrate solution to treat I. sinensis and to analyze the characteristics of uptake, transportation and accumulation of lead in I. sinensis by measuring the concentration of Pb2+ in the roots, rhizomes and leaves. The results showed that I. sinensis could absorb lead from both the root system and the leaves and upward or downward transport, and then accumulate lead in all organs, especially in the leaves. Comparatively, the ability of leaf to absorb and to accumulate lead was the strongest among organs. In the treatment I, the lead content of the organs direct contacted with lead solution were 1190 mg kg-1, 3474 mg kg-1 and 95906 mg kg-1 in the leaves, roots and rhizomes, respectively. Although the ability of lead transportation between rhizome and leaf was stronger, the ability of lead translocation was weak on the whole in contrast to other heavy metals. Isoetes sinensis is a lead hyperaccumulating plant and can maintain the ability of leaf regeneration under 2000 mg kg-1 high concentration of lead stress after 30 days.
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