1987-1988年,测定了13个我国籼粳稻品种的内源吲哚乙酸(IAA)和赤霉素(GA)类物质的含量。结果表明,我国矮化育种中所用的主要矮源及其衍生的半矮秆品种,其内源GA类物质和IAA的含量都远低于高秆品种的含量,矮秆品种的GA类物质只有高秆品种的70%-80%,而IAA只有高秆品种的20%左右。因此,我国育种家所用的矮性基因,不论是sd-1,sd-g或微效多基因,其所控制的3种性状(株高、分蘖性和叶片着生角)的表达不仅通过前人所述的GA类物质,而且还通过IAA调节,又矮秆品种在一生的各生育期,GA类物质含量都低于高秆者,说明矮生性基因在一生各时期都表达。 From 1987 to 1988, the content of endogenous indole acetic acid (IAA) and gibberellin (GA) in 13 indica and japonica cultivars in China were determined. The results showed that the content of endogenous GA and IAA in the main dwarf varieties and their semi-dwarf varieties used in dwarf breeding in China were much lower than those in the high-stalk varieties. The only GA type in the dwarf varieties 70% -80% of high-stalk varieties, IAA only about 20% of high-stalk varieties. Therefore, the short-lived genes used by breeders in our country, whether sd-1, sd-g or microspolymorphism, controlled the expression of the three traits (plant height, tillering and leaf streaking angle) The GA species, but also through the IAA regulation, dwarf varieties in each lifetime of life, GA substances were lower than tall stalks, stubble genes expressed throughout the life of each period.