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二、柑桔的育种和品种发展 1914年当Howard B.Frost在加州大学柑桔试验站开始柑桔育种时,其柑桔属间杂交的知识仅仅局限于对美国农业部在佛罗里达州的早期研究的了解。Frost在可供食用的柑桔中进行了一系列广泛的杂交,但最初获得的杂种受到了珠心胚酌限制,这是因为珠心胚是由珠心组织的体细胞发育而来的缘故。由于这些珠心胚是无性生殖的,没有雄性细胞参与它的形成,所以它们通常与母本在遗传组成上相一致。
B. Citrus Breeding and Variety Development When Howard B. Frost started citrus breeding at the University of California Clematis Test Station in 1914, his knowledge of the intercropping of citrus was confined to an earlier study by the USDA in Florida Understand. Frost conducted a series of extensive crosses in ready-to-eat oranges, but initially the hybrids were restricted by the embryo of the embryo because the embryo is derived from the somatic cells of the nacre. Since these beads are asexually germ-free, and no male cells are involved in its formation, they are usually genetically identical to the female parent.