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Carrot somatic embryogenesis. A dream come true?
Tatsuhito Fujimura 한국식물생명공학회 2014 Plant biotechnology reports Vol.8 No.1
Professor Komamine asked me to refine thesystem of carrot somatic embryogenesis in 1972. That wasa very hard task, but after refining the system, we haveunderstood the process of somatic embryogenesis clearly. The refined system has been used in physiological, biochemicaland molecular biological studies of embryogenesis. Culture and embryo induction of carrot cells are easy,but the outcrossing nature of carrots hinders developmentof genetic and molecular biological analyses of embryogenesis. Rapid development of DNA technologies like nextgeneration sequencing and transformation technique ofcarrot cells will open the way to clarify the mechanism ofcarrot somatic and zygotic embryogenesis.
Choi, Pilson,Mano, Yoshiro,Ishikawa, Atsuko,Odashima, Masashi,Umezawa, Taishi,Fujimura, Tatsuhito,Takahata, Yoshihito,Komatsuda, Takao The Korean Society of Plant Biotechnology 2010 Plant biotechnology reports Vol.4 No.1
Quantitative trait loci (QTLs) controlling ability of somatic embryogenesis were identified in soybean. A frame map with 204-point markers was developed using an RI population consisting of 117 $F_{11}$ lines derived from a cross between cultivar 'Keburi' and a weedy soybean 'Masshokutou Kou 502'. The parents differed greatly in their abilities of somatic embryogenesis using immature cotyledons as explants. The ability of somatic embryogenesis was evaluated in five different experiments: the $F_{11}$ (evaluated in 1998) and $F_{15}$ (2002) generations cultured on basal media supplemented with $40\;mg\;l^{-1}$ 2,4-D (2,4-D1998 and 2,4-D2002), $F_{14}$ (2001) generation on medium with $40\;mg\;l^{-1}$ 2,4-D and high sucrose concentration [2,4-D2001 ($30\;g\;l^{-1}$ sucrose)], and the $F_{11}$ (1998) and $F_{12}$ (1999) generations on medium with $10\;mg\;l^{-1}$ NAA (NAA1998 and NAA1999). The RILs showed wide and continuous variations in each of the five experiments. In the composite interval mapping analysis, 2 QTLs were found in group 8 (D1b + W, LOD = 5.42, $r^2$ = 37.5) in the experiment of 2,4-D1998 and in group 6 (C2, LOD = 6.03, $r^2$ = 26.0) in the experiment of 2,4-D2001 (high concentration sucrose). In both QTLs, alleles of 'Masshokutou Kou 502' with high ability of somatic embryogenesis contributed to the QTLs. For the other three experiments, no QTL was detected in the criteria of LOD >3.0, suggesting the presence of minor genes.