4.5 Article

Effects of GA(3) on Plant Physiological Properties, Extraction, Subcellular Distribution and Chemical Forms of Pb in Lolium perenne

Journal

INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
Volume 17, Issue 12, Pages 1153-1159

Publisher

TAYLOR & FRANCIS INC
DOI: 10.1080/15226514.2015.1045124

Keywords

L; perenne; GA(3); Pb; phytoextraction; detoxification mechanism

Funding

  1. Zhejiang Provincial National Science Foundation of China [LY13C030001]

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The effects of growth-promoting hormone gibberellic acid 3 (GA(3)) on physiology, Pb phytoextraction, and metal detoxification mechanisms in Lolium perenne were studied. Results showed that addition of GA(3) alone at lower doses (1 or 10M) facilitated antioxidant defense of L. perenne under Pb stress, decreased the toxicity of Pb in plant shoot by increasing the proportion of Pb in cell wall, hence significantly enhanced photosynthesis and plant growth, as well as Pb uptake and accumulation in L. perenne (P < 0.05). However, these indicators showed the opposite changes when treated with GA(3) at a higher dose (100M). Of the total Pb in plant shoot, 36-51% was associated with cell wall, and 31-40% was soluble fraction, while 41.4-49.7% was NaCl extractable, 24.6-35.4% HAc extractable followed by other fractions. These findings suggest that Pb fixation by pectates and proteins in cell wall and sequestration in vacuole are responsible for Pb detoxification in plant, and the GA(3) at 1M appears to be optimal for enhancing Pb phytoextraction by L. perenne from Pb polluted soils.

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