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枣属植物经过染色体鉴定的有５个种，其中毛叶枣（Ｚｉｚｙｐｈｕｓｍａｕｒｉｔｉａｎａ Ｌ一ａｍｋ）和圆叶枣（Ｚ.ｒｏｔuｎｄｉfoliａ）为多倍体种，麻核枣（Z．ｏｅｎｏplia）和印度枣（Ｚ．ｕｊｕｂａ Ｍｉｌｌ）有多倍体类型．自然形成的多倍体有４x、 ６x和8x，未发现有奇数倍性。中国枣（Ｚ．ｓａｔｉｖａ Ｆａｅｒｔｎｅｒ）为一倍体种，未见自然多倍体类型。 自１９７８年开始，对中国枣长红、圆铃、金丝小枣等品种进行胚乳培养，首次育成３n＝３x＝３６的完整植株．１９８３年始花座果，为枣属植物增添了新的种质资源．
There are 5 species of jujube species after chromosome identification, including Zizyphus mauritiana L-amk and Z.rotundifolia polyploid, Z.oenoplia and Z Jujuba Mill) is polyploid type. Naturally formed polypots are 4x, 6x and 8x, with no odd ploidy found. Chinese date (Z.sativa Faertner) as a diploid species, no natural polyploid type. Since 1978, endosperm culture has been carried out on Chinese jujube red, round bell, golden jujube and other varieties, and the first 3n = 3x = 36 plants were bred for the first time. In 1983 the first flower fruit, jujube plants add new germplasm resources.