Variation in arsenic accumulation and translocation among wheat cultivars: the relationship between arsenic accumulation, efflux by wheat roots and arsenate tolerance of wheat seedlings.
Fifty-seven wheat cultivars were used to investigate the differences in arsenic (As) accumulation, efflux and translocation among wheat cultivars and their relationship with arsenate (As(V)) tolerance under hydroponic condition. The relationship between wheat root As accumulation, As(V) uptake, arsenite (As(III)) efflux and As(V) tolerance of 14 wheat cultivars were also investigated. The results showed there were significant (p<0.001) differences in As(V) tolerance, As accumulation and translocation among 57 wheat cultivars. Arsenate tolerance of wheat seedlings was positively correlated with As(V) uptake (p<0.05), root As concentration (p<0.001), but negatively correlated (p<0.05) with TFs and relative As(III) efflux. No significant correlation between As(III) efflux and As(V) tolerance was found (p=0.442). 56-83% of total As taken up by roots was extruded to nutrient solution. Root As concentration was positively correlated with As(V) uptake (not significant, p=0.100), negatively correlated (p<0.001) with relative As(III) efflux, whereas not significantly correlated (p=0.773) with As(III) efflux. The results indicated that As(V) tolerant wheat cultivars have much higher capacity of root As accumulation. Arsenic detoxification in root cells is important for wheat seedlings under As(V) exposure.
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
Gao Ling
GL
Shi
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
Shun
S
Zhu
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
Ji Rong
JR
Meng
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
Meng
M
Qian
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China.
Na
N
Yang
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China. Electronic address: loulq@njau.edu.cn.
Lai Qing
LQ
Lou
College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, PR China. Electronic address: qscai@njau.edu.cn.
Qing Sheng
QS
Cai
D001151:Arsenic / Q000032:analysis* / Q000378:metabolism* / Q000633:toxicity; D001152:Arsenicals / Q000737:chemistry / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects*; D014908:Triticum / Q000737:chemistry* / Q000187:drug effects / Q000378:metabolism*
D001152:Arsenicals; D001151:Arsenic
Accumulation; Arsenic; Efflux; Tolerance; Wheat