关键词: 铅污染, 铅污染, 砷污染, 硒, 种子发芽, 幼苗生长

Abstract: To facilitate rice breeding with heat tolerance, we try to screen heat-resistant resources from Africa rice. Using the newly established cascade temperature method, six rice varieties from various regions of Africa were treated with high temperature in flowering period. The heat-tolerant index and integrated heat-tolerant index were calculated by the fertilization rate under different high-temperature treatments, and the integrated heat-tolerant index was selected to judge their heat tolerance. The heat-tolerant index of‘SDWG005’was greater than 0.9 among high-temperature treatments and its’integrated heat-tolerant index was 6.462, showing significant heat tolerance. The heat- tolerant index of‘SDWG001’was greater than 0.5 among hightemperature treatments and its’integrated heat-tolerant index was 4.163, showing strong heat tolerance. The heat-tolerant index of both‘SDBN001’and‘SDSL013’were lower than 0.5 under 37℃ treatment and greater than 0.6 under other treatments. The integrated heat-tolerant index of the two varieties was 3.694 and 3.406, respectively, showing relatively high heat resistance. By screening, an extremely strong heat-resistant variety ‘SDWG005’and two strong heat-resistant varieties‘SDWG001’and‘SDBN001’were obtained. The results suggest that some rice germplasm resources from Africa may have heat-tolerant genes, which can be used for breeding heat tolerant rice in the future.