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以标志基因系和ＩＲ３６三体为工具材料，通过杂交，研究了籼稻矮秆材料双矮所携半矮秆基因ｓｄ－ｇ在染色体上的位置。结果表明：半矮秆基因ｓｄ－ｇ与标志基因系Ｍ４所携隐性主基因ｇｈ－１和Ｍ２７所携隐性主基因ｎ１表现连锁。ｓｄ－ｇ与ｇｈ－１之间的交换值为２４．３３％±３．９６％，ｓｄ－ｇ与ｎ１之间的交换值为２９．４４％±４．８１％。由于ｇｈ－１和ｎ１均位于第５染色体，因而推定ｓｄ－ｇ位于第５染色体上。
With the marker gene lines and IR36 trisomies as the tool material, the position of sd-g on the chromosomes of the dwarf short-lived hybrid dwarf rice bearing indica dwarf materials was studied by crossing. The results showed that the semi-dwarf gene sd-g was linked with the recessive major gene n1 carried by the recessive major genes gh-1 and M27 of marker gene M4. The exchange value between sd-g and gh-1 is 24.33% ± 3.96%, and the exchange value between sd-g and n1 is 29.44% ± 4.81%. Since both gh-1 and nl are located on chromosome 5, it is presumed that sd-g is located on chromosome 5.