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Production of Triploid Somatic Hybrids Between Mandarin and Grapefruit through Electrofusion
Kunitake, Hisato The Korean Society of Plant Biotechnology 2000 Plant molecular biology and biotechnology research Vol.2 No.2
Somatic hybrids were produced by electrofusion between embryogenic callus protoplasts of 'Syougun' mandarin and leaf protoplasts of grapefruit. Hybridity of the two plants was confirmed by leaf morphological characteristics and random amplified polymorphic DNA (RAPD) analysis. The cpDNA analysis using PCR-RFLP could not distinguish those of both parents. These plants showed normal growth and had chromosome number of 27. These unexpected triploid somatic hybrids might be derived from fused cells between diaploid protoplast of embryogenic calli and diploid protoplast of leaf, because polysomaty, a mixture of haploid cells and diploid cells was observed in the lactose medium-pretreated embryogenic calli of 'Syougun' by flow cytomehy analysis.
Tsunaki Nukaya,Masaki Yahata,Kensaku Suzuki,Kiichi Yasuda,Hisato Kunitake,Haruki Komatsu,Hiroo Mukai,Hisashi Harada,Toshihiko Takagi 한국원예학회 2009 Horticulture, Environment, and Biotechnology Vol.50 No.3
Autotetraploidy (2n=4X=36) five lines of Meiwa kumquat (Fortunella crassifolia Swingle, 2n=2X=18), which had been induced by treating the nucellar embryos with colchicines, were selected and investigated to determine the fruit characteristics. The fruit weight of tetraploid plants was heavier than that of diploid plants. The percentage of pericarp weight per fruit in tetraploid plants increased significantly compared to that of diploid plants. The sugar content in pericarp of tetraploid plants was significantly higher than that of diploid plants. The organic acid content of tetraploid plants was almost equal to that of diploid plants. Thus, it can be concluded that tetraploidy enhanced desirable traits such as larger fruit size with thicker pericarp and high sugar content in Meiwa kumquat.