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Abstract This study was conducted to investigate how to enhance resistance to oxidative stress in petunia progeny ob-tained by a crossing between transgenic plants, MnSOD (SOD2) (T 4 ) and NDPK2 (T 2 ), to develop transgenic petunia much more resistant to environmental stress. At the treatment of MV 200 μM, the progeny was significantly less damaged than its parental plants (SOD2- or NDPK2-transgenic lines) as well as wild type plants, implying its resistance to oxidative stress was enhanced compare to that of SOD2- or NDPK2- transgenic plants. In an expression of 11 quantitative traits, the progeny remained similar to control plants, although it infrequently displayed slightly longer or wider than either parental or wild type plants. In the expression of 6 qualitative traits, there was no significant difference between parental or non-transgenic control plants. Keywords Environmental stress, Morphological traits, PCR, Petunia hybrida Introduction Many researchers have studied to develop plants resistant to the abiotic stresses through the transfer of superoxide dismutase (SOD) or ascorbate peroxidase (APX) or nucleo-tide diphosphate kinase (NDPK) genes in many crops (Fang et al. 2002; Kim et al. 2005; Lee et al. 2009a, 2009b, 2010; Moon et al. 2003; Tang et al. 2004a, 2004b, 2007). These crop cultivars that are more resistant to environmen-tal stress (or abiotic stress) are needed in times of unpre-dictable weather condition. Recent developments in plant genetic engineering are aimed at increasing resistance by integration of multiple transgenes into plants genome (multiple-transgene-stacking) and coordinated expression of these transgenes in transgenic plants (Francois et al. 2002). Also, there were recent reports on transgenic plants that are more resistant to abiotic stess through the intro-duction of two genes (SOD and APX genes) (Kwon et al. 2002; Lim et al. 2007). Since petunia is mainly used to be planted on the roadside in company with pansy in Korea, there is a need to develop cultivar resistant to abiotic stresses such as rain-fall, humidity, and air pollution. The Floricultural Research Division at National Institute of Horticultural & Herbal Science has previously developed the MnSOD (SOD2) transgenic petunia (T

journal of plant biotechnology/sigmul saengmyeong gong haghoeji/journal of plant biotechnology

Increase of resistance to oxidative stress induced by methyl viologen in progeny from a cross between two transgenic Petunia lines with NDPK and SOD genes