Test on Compatibility of Indica-Compatible Japonica Lines in Rice

The indica compatible japonica line(ICJL), a kind of new rice germplasm, can produce fertile F 1 with indica and should be characterized by japonica genome. The test method and identification standard of the compatibility for ICJL were developed. Six indica varieties and six japonica varieties were suggested as testers. Crossed with six indica testers, the indica compatible lines should produce F 1 hybrids with an average pollen and spikelet fertility above 85% and 80%, respectively. The compatibility of ten candidate ICJLs were studied by using testers. It indicated that the compatibility with indica of four candidate ICJLs were found to be high enough to accord with the demand of indica compatible line. The ICJLs G2416 3 and G2417 2 1 were grouped into exceptionally indica compatible lines on their low japonica compatibility, while G2605 and G3004 4 were grouped into wide compatible lines on their high japonica compatibility.