摘要
为探明硫对水稻幼苗镉积累特性及亚细胞分布特征的影响,进行水培试验。以高镉积累水稻品种T优705和低镉积累品种湘早籼24为材料,研究硫对水稻幼苗吸收累积镉的影响及其植株体内亚细胞分布的变化。结果表明,当施硫水平为2.8 mg·L-1时,2个品种根系和地上部分的镉含量均显著降低;当施硫浓度为0.3 mg·L-1时,只有湘早籼24根系中的Cd含量显著降低(P<0.05)。施硫可显著降低水稻根系中的镉向地上部分转移,增加水稻地上部细胞壁中的Cd分配比例,降低胞液中的Cd分配比例。与根系相比,地上部的Cd积累量更容易受到施硫水平的影响。因此,针对不同品种,在水稻苗期合理施硫可有效地缓解Cd毒害。
In order to prove up the effects of sulfur on the accumulation and subeellular distribution of cadmium in rice seedlings, water pot experiment was carried through. The high Cd accumulation rice variety T You 705 （T705） and the low Cd accumulation variety Xiangzaoxian 24 （ X24 ） were used to investigate the effect of exogenous sulfur on cadmium uptake and subcellular distribution in rice seedlings. The present study showed when sulfur level in solution was at 2.8 mg·L^-1, Cd accumulation was significantly reduced both in roots and shoots of two rice varieties. When sulfur concentration was at 0.3mg·L^-1, Cd concentration was significantly reduced only in X24 roots. Sulfur addition significantly inhibited the Cd transport from root to shoot, increased the percentage of Cd distribution in cell wall of shoot tissues, and decreased the percentage of Cd distribution in soluble fraction of shoot cells. Comparing with root, the Cd accumulation in shoot was more sensitive to the S fertilizer level. Therefore, in view of the different varieties of rice seedling, the reasonable application of sulfur could effectively alleviate Cd toxicity.
出处
《农业资源与环境学报》
CAS
2015年第3期275-281,共7页
Journal of Agricultural Resources and Environment
基金
公益性行业(农业)科研专项(201403015)
2014年中国农科院科技创新工程项目(2014-cxgc-lzq)
关键词
水稻
镉
硫
镉含量
亚细胞分布
rice
cadmium
sulfur
Cd accumulation
subcellular distributionin
