PJB-2017-215
MANGANESE ACCUMULATION AND ANATOMICAL CHANGES IN MASSON PINE (PINUS MASSONIANA) GROWING UNDER HIGH CONCENTRATIONS OF MANGANESE
DEYAN LI, YUNCHAO ZHOU AND JIEFANG GONG
Abstract
Masson pine (Pinus massoniana) is especially good at accumulating manganese (Mn). Studying the manganese accumulation and anatomical changes in masson pine growing under high concentrations of Mn can provide a theoretical basis for exploring the adaptations and assessing the remediation effects of masson pine under Mn-contaminated environment. Using a sand culture method, a series of high manganese treatments were performed to study the growth, manganese accumulation in organs, and anatomical structure of needles and stems of masson pine when compared to masson pine that received Hoagland’s nutrient solution. Our results showed that the parenchyma cells and vascular bundles in the needles of masson pine changed disproportionately to maintain growth under high concentrations of Mn, and similar patterns were observed for the xylem and pith in the stem. At low concentrations of Mn, masson pine stems and needles displayed an even and regular anatomical structure, but the cell arrangement became scattered with increasingly higher Mn treatments; especially in the 30 mmol·L-1 treatment, masson pine growth was inhibited and severe toxicity occurred. With higher Mn treatments, more Mn accumulated in masson pine. Needles, stems and roots of masson pine accumulated about 24, 24 and 27 times more Mn in the 30 mmol·L-1 treatment than in the normal treatment of 0.0091 mmol·L-1. Results indicate that masson pine could be planted in Mn-contaminated environments to rehabilitate the soil.
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