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Effects of lead/zinc tailings on photosynthetic characteristics and antioxidant enzyme system of Ricinus communis L.

YI Xin-yu1, JIANG Li-juan1*, CHEN Jing-zhen2, LIU Qiang1, YI Shi-ming1   

  1. (1Central South University of Forestry and Technology, Changsha 410004, China; 2Hunan Academy of Forestry, Changsha 410000, China).
  • Online:2016-04-10 Published:2016-04-10

Abstract:

Effects of medium mixed with different contents of lead/zinc tailings on the photosynthetic capacity, active oxygen eliminating system and chloroplast ultrastructure of a castor bean variety, Xiangbi No. 1 were studied based on a pot experiment. The results showed that the chlorophyll contents, photosynthetic parameters, SOD, POD and CAT activities increased firstly, then declined with the increase of the tailings content, in particular those physiological and biochemical indices of group A (100% slag) decreased significantly. The contents of chla, chlb and total chlorophyll, the activities of POD and SOD of plants in group D (80% slag + 20% soil without Pollution) increased by 27%, 33%, 29%, 98% and 580% respectively, compared to control group G (50% loess + 50% peat). The observation of chloroplast ultrastructure indicated that there were degenerated lammella system, fewer starch grains and more swollen osmiophilic globule in the chloroplast of plant in group A than those of the other groups, which meant the damage of the chloroplast ultrastructure in group A was the most serious. Even though the grana lamellae vacuolated to some extent, the leaves had enough photosynthetic capacity to support plant growth when the slag ratio was up to 80%. Compared with control group, there was little change of the doublelayer capsule, internal grana and structure of thylakoid of plants potted in medium containing less than 60% slag. Moreover, the photosynthetic capacity and antioxidase activity were enhanced. All the results suggested that the castor bean was lead/zinc tolerant, and could be used for remediation of lead/zinc contaminated soils.

 

Key words: photosynthetic indicator, spatial heterogeneity, Larix olgensis, environmental factor