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Nat Methods. 2008;5(7):621–628. http://dx.doi.org/10.1038/nmeth.1226 12. Xu P, Liu Z, Fan X, Gao J, Zhang X, Zhang X, et al. De novo transcrip￾tome sequencing and comparative analysis of differentially expressed genes in Gossypium aridum under salt stress. Gene. 2013;525(1):26–34. http://dx.doi.org/10.1016/j.gene.2013.04.066 13. Hao QN, Zhou XA, Sha AH, Wang C, Zhou R, Chen SL. Identifica￾tion of genes associated with nitrogen-use efficiency by genome-wide transcriptional analysis of two soybean genotypes. BMC Genomics. 2011;12(1):525. http://dx.doi.org/10.1186/1471-2164-12-525 14. Tsai WC, Hsiao YY, Pan ZJ, Hsu CC, Yang YP, Chen WH, et al. Molecular biology of orchid flowers. Adv Bot Res. 2008;47:99–145. http://dx.doi.org/10.1016/s0065-2296(08)00003-7 15. Yu H. Identification and characterization of three orchid MADS￾box genes of the AP1/AGL9 subfamily during floral transition. Plant Physiol. 2000;123(4):1325–1336. http://dx.doi.org/10.1104/ pp.123.4.1325 16. 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Molecular and physiological characterization of the Arabidopsis thaliana oxidation-related zinc finger 2, a plasma membrane protein involved in ABA and salt stress response through the ABI2-mediated signaling pathway. Plant Cell Physiol. 2012;53(1):193–203. http:// dx.doi.org/10.1093/pcp/pcr162 26. van der Krol AR. Flavonoid genes in petunia: addition of a limited number of gene copies may lead to a suppression of gene expression. Plant Cell. 1990;2(4):291–299. http://dx.doi.org/10.1105/tpc.2.4.291 27. Kishimoto S, Sumitomo K, Yagi M, Nakayama M, Ohmiya A. Three routes to orange petal color via carotenoid components in 9 composi￾tae species. J Jpn Soc Hortic Sci. 2007;76(3):250–257. http://dx.doi. org/10.2503/jjshs.76.250 28. Matsui S. Varietal differences in flower colors of Cattleya aurantiaca. Res Bull Fac Agric Gifu Univ Jpn. 1992;57:181–185. 29. Tatsuzawa F, Ichihara K, Shinoda K, Miyoshi K. Flower colours and pigments in Disa hybrid (Orchidaceae). South Afr J Bot. 2010;76(1):49–53. http://dx.doi.org/10.1016/j.sajb.2009.06.017 30. Grotewold E. The genetics and biochemistry of floral pigments. Ann Rev Plant Biol. 2006;57(1):761–780. http://dx.doi.org/10.1146/annurev. arplant.57.032905.105248