Exogenous GR24 Alleviates Cadmium Toxicity by Reducing Cadmium Uptake in Switchgrass ( Panicum virgatum ) Seedlings

Zhenglan Tai, Xinqiang Yin, Zhigang Fang, Gaoling Shi, Laiqing Lou and Qingsheng Cai
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Zhenglan Tai: College of Life Sciences, Nanjing Agricultural University, 210095 Nanjing, China
Xinqiang Yin: College of Life Sciences, Nanjing Agricultural University, 210095 Nanjing, China
Zhigang Fang: College of Life Sciences, Nanjing Agricultural University, 210095 Nanjing, China
Gaoling Shi: Provincial Key Laboratory of Agrobiology, Jiangsu Academy of Agricultural Sciences, 210014 Nanjing, China
Laiqing Lou: College of Life Sciences, Nanjing Agricultural University, 210095 Nanjing, China
Qingsheng Cai: College of Life Sciences, Nanjing Agricultural University, 210095 Nanjing, China

IJERPH, 2017, vol. 14, issue 8, 1-12

Abstract: Strigolactones (SLs) are classified into plant hormones, playing a key role as a mediator of plant growth in response to several abiotic stresses, including drought and salinity. However, the role of SLs in cadmium (Cd)-induced stress to plants is still unknown. The physiological responses of switchgrass ( Panicum virgatum ) stressed in 10 ?mol L -1 Cd to exogenous synthetic SLs analog, GR24 were studied in hydroponics. The Cd stress significantly caused the adverse effects on plant growth and root morphology, inhibited photosynthesis, but boosted lipid peroxidation of Switchgrass seedlings. After treatment of 1 ?mol L -1 GR24, the above adverse effects caused by Cd stress were significantly alleviated, mainly reflects in improvement of shoot biomass, relative water content, root development, chlorophyll contents, activities of typical antioxidant enzymes, nutrient uptake. The reason for exogenous GR24 alleviating cadmium toxicity might be owing to that exogenous GR24 promoted the content of endogenous SLs, increased some essential element Fe (iron), Zn (zinc), Mn (manganese) and Cu (copper) uptake and reduced cadmium uptake, accumulation and partition in shoot of switchgrass seedlings.

Keywords: Strigolactones; cadmium; root architecture; subcellular distribution; antioxidant enzymes; endogenous GR24 (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (3)

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