柑桔及其近缘属一般为二倍体,体细胞染色体数为18。从某些二倍体间杂交获得的小种子中育出了三倍体植株。三倍体因为无籽,可望成为商品化品种。本文是作者在进行二倍体间杂交培育三倍体实生苗中,从小种子育出了五倍体实生苗。把二倍体的枳和川野日本夏橙、四倍体的舟床蜜相和从无性系苗获得的特罗维特甜橙的花粉人工授粉到二倍体单胚品种宫内伊予柑上。与四倍体品 Citrus and its relatives are generally diploid, somatic chromosome number of 18. Triploid plants were bred from the small seeds obtained from some diploid crosses. Triploid because no seeds, is expected to become commercial varieties. This article is the author in the diploid hybridization breeding triploid seedlings, seed raised from the fifth seedlings. Diploid Trifoliate Orange and Kawano Japanese summer orange, tetraploid boat bed honey and pollen of Tropitant Orange obtained from clonal seedlings were artificially pollination to diploid monogamy IU. With tetraploid