In-vitro Breeding Provides New and Unique Opportunities for Conventional Citrus Breeding
The application of protoplast fusion technology in citrus improvement has resulted in the regeneration of somatic hybrid plants from more than 500 parental combinations. In rare cases, a new somatic hybrid may have direct utility as an improved cultivar; however, the most important application of somatic hybridization is the building of novel germplasm as a source of elite breeding parents for various types of conventional crosses. This is especially true in citrus, where somatic hybridization is generating superior allotetraploid breeding parents for use in interploid crosses to generate seedless triploids. Seedlessness is a key breeding objective for new fresh fruit citrus varieties, and hundreds of triploid hybrids have been produced using somatic hybrids as the tetraploid parent. Successful somatic hybridization in citrus rootstock improvement has allowed for the creation of a rootstock breeding program at the tetraploid level that achieves maximum genetic diversity in zygotic progeny and has great potential for tree size control via polyploidy. Tree size control has gained importance as a means of reducing harvesting costs, maximizing the efficiency of modern cold protection methodology, and facilitating the adaptation of new fruit production systems. Rootstock breeding at the tetraploid level facilitates the packaging of the many required traits for an improved rootstock into individual hybrids, including disease and insect resistance, wide adaptation, and ability to consistently produce high yields of quality fruit. Recent progress and successful examples of these applications will be discussed.
Citrus Disease resistance Rootstock Scion Seedless fruit Somatic hybridization
Jude W. Grosser Fred G. Gmitter Jr
University of Florida/IF AS, Citrus Research and Education Center, 700 Experiment Station Road, Lake Alfred,Florida 33850, U. S. A
国际会议
11th International Citrus Congress(第11届国际柑橘大会)
武汉
英文
237-242
2008-10-01（万方平台首次上网日期，不代表论文的发表时间）