海枣树的组织培养物(含有海枣树无性繁殖所需全部遗传“信息”的愈伤组织材料)已成功地冷冻至-196℃,经解冻培育成幼苗。这一发现使建成冷冻种质库成为可能。在冷冻种质库中,所有已知海枣树遗传材料的理想品种皆能贮存在“试管”中,供将来育种用。目前,用几英亩土地只能保持几个海枣树变种,种子是靠不住的,因种子并不繁殖“真树”。加利福尼亚州帕萨迪纳农业研究局的植物 Tissue culture of date tree (callus material containing all genetic “information” required for clonal propagation of date tree) has been successfully frozen to -196 ° C and thawed to seedlings. This finding makes it possible to build a library of frozen germplasm. In the frozen genebank, all the ideal varieties of jujube tree genetic material are stored in “test tubes” for future breeding. Currently, with only a few acres of land can hold several varieties of jujube tree, the seeds are unreliable, because the seeds do not breed “real tree.” Pasadena Agricultural Research Institute, Pasadena, California