Croucher Institute for Environmental Sciences, and Department of Biology, Hong Kong Baptist University, Kowloon Tong, Hong Kong SAR, PR China.
J Exp Bot. 2011 May;62(8):2889-98. doi: 10.1093/jxb/erq462. Epub 2011 Feb 3.
Root aeration, arsenic (As) accumulation, and speciation in rice of 20 different genotypes with regular irrigation of water containing 0.4 mg As l(-1) were investigated. Different genotypes had different root anatomy demonstrated by entire root porosity (ranging from 12.43% to 33.21%), which was significantly correlated with radial oxygen loss (ROL) (R=0.64, P<0.01). Arsenic accumulation differed between genotypes, but there were no significant differences between Indica and Japonica subspecies, as well as paddy and upland rice. Total ROL from entire roots was correlated with metal tolerance (expressed as percentage mean of control straw biomass, R=0.69, P<0.01) among the 20 genotypes; total As concentration (R=-0.67, P<0.01) and inorganic As concentration (R=-0.47, P<0.05) in rice grains of different genotypes were negatively correlated with ROL. There were also significant genotype effects in percentage inorganic As (F=15.8, P<0.001) and percentage cacodylic acid (F=22.1, P<0.001), respectively. Root aeration of different genotypes and variation of genotypes on As accumulation and speciation would be useful for selecting genotypes to grow in areas contaminated by As.
研究了 20 个不同基因型水稻在含有 0.4mg As l(-1)的水中进行常规灌溉时的根系通气、砷（As）积累和形态。不同基因型的根解剖结构不同，表现为整个根孔隙率（12.43%-33.21%），这与径向氧损失（ROL）显著相关（R=0.64，P<0.01）。基因型之间的砷积累存在差异，但籼稻和粳稻亚种以及水田和旱地水稻之间没有显著差异。整个根系的总 ROL 与 20 个基因型中的金属耐受性呈正相关（表示为对照秸秆生物量的百分比平均值，R=0.69，P<0.01）；不同基因型水稻籽粒中的总 As 浓度（R=-0.67，P<0.01）和无机 As 浓度（R=-0.47，P<0.05）与 ROL 呈负相关。不同基因型的无机 As 百分比（F=15.8，P<0.001）和二甲胂酸百分比（F=22.1，P<0.001）也存在显著的基因型效应。不同基因型的根系通气以及基因型对 As 积累和形态的变化，将有助于在 As 污染地区选择适合生长的基因型。
