两种通气组织不同的水稻品种根表铁膜的形成及砷吸收积累的差异

Differences of Iron Plaque Formation and As Accumulation between Two Rice Cultivars with Different Aerenchyma Tissue

采用土壤盆栽试验方法,比较了两种通气组织结构不同的水稻品种(扬稻6号和农垦57)根表铁膜的形成及其吸收积累As的差异.结果表明,通气组织结构不同对水稻根表铁膜的形成及其对As的吸收积累有显著影响.通气组织结构发达的扬稻6号根表铁膜数量和铁膜中As含量均显著高于农垦57,扬稻6号根表铁膜量为431.53g·kg-1,铁膜中As含量达到220.2mg·kg-1,分别是农垦57的1.3和1.7倍.发达的通气组织结构显著抑制了As由水稻地下部到地上部的转运以及地上部对As的吸收:扬稻6号地上部As含量为10.77mg·kg-1,显著低于农垦57(12.85mg·kg-1);扬稻6号对As的转移系数(TF)为0.067,仅为农垦57的73.6%.

Two rice cultivars, Yangdao 6 with highly developed aerenchyma tissue and Nonken 57 with less developed aerenchyma tissue were used to study the relationship between the aerenchyma structure and the amount of iron plaque in root surface, and the arsenic accumulation in the iron plaque and in rice tissues in a pot experiment. Results showed that the amount of iron plaque and arsenic concentration in iron plaque were significantly affected by the aerenchyma tissue. The amount of iron plaque and arsenic concentration in iron plaque in the root surface of Yangdao 6 were significantly higher than those of Nongken 57. The amount of iron plaque and the arsenic concentration in iron plaque of Yangdao 6 were 431.53g·kg -1 and 220.2mg·kg -1, respectively, and were 1.3 and 1.7 times higher than those of Nongken 57, respectively. Developed aerenchyma tissue could restrain significantly the As translocation from root to shoot in rice plant and the As accumulation in rice shoot. Arsenic concentration in shoot of Yangdao 6 was 10.77mg·kg-1, and significantly lower than that of Nongken 57 （12.85mg·kg -1）. Arsenic translocation factor （TF）of Yangdao 6 was 0.067, and only 73.6% of TF of Nongken 57.