The relationship of root porosity and radial oxygen loss on arsenic tolerance and uptake in rice grains and straw.
The relationship of root porosity and radial oxygen loss on arsenic tolerance and uptake in rice grains and straw.
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DOI：
10.1016/j.envpol.2009.02.037
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发表时间：
2009-08
影响因子：
8.9
通讯作者：
X. Mei;Zhihong Ye;M. H. Wong
中科院分区：
文献类型：
--
作者：
X. Mei;Zhihong Ye;M. H. Wong
以25个水稻品种为试材，通过两个盆栽试验研究了水稻籽粒和秸秆中砷（As）积累量与根系径向氧损失率（ROL）和孔隙度之间的相关性。结果表明，小麦籽粒砷含量（0.71-1.72mgkg-1）和秸秆砷含量（15.6-31.7mgkg-1）、根腐解率（7.40- 13.24mmolO2 kg-1）、根干重（100 mg kg-1）、根腐解率（100 mg kg-1）和根腐解率（100 mg kg-1）均存在显著差异。h-1），气孔率为20.91-33.08%。籽粒和秸秆中As含量分别与ROL和孔隙度呈显著负相关，ROL率与孔隙度呈显著正相关。高孔隙度的水稻品种具有较高的ROL率，并有较高的能力限制砷转移到地上部组织。
The correlations among arsenic (As) accumulation in grains and straw, rates of radial oxygen loss (ROL), and porosity of roots using 25 rice cultivars were investigated based on two pot experiments: (1) soil with addition of 100mg Askg−1for analysis of As in grains and straw, and (2) deoxygenated solution for analyzing rates of ROL and porosity of roots. The results showed that there were great differences in grain As (0.71–1.72mgkg−1) and straw As (15.6–31.7mgkg−1), rates of ROL (7.40–13.24mmol O2kg−1root d.w. h−1), and porosity (20.91–33.08%) among the cultivars. There were significant negative correlations between As in grains or straw and ROL and porosity, and significant positive correlations between rates of ROL and porosities, respectively. Rice cultivars with high porosities tended to possess higher rates of ROL, and had higher capacities for limiting the transfer of As to aboveground tissues.