plants Article Comparative Analysis of Volatile Compounds of Gamma-Irradiated Mutants of Rose (Rosa hybrida) Jaihyunk Ryu 1 , Jae Il Lyu 1 , Dong-Gun Kim 1, Jung-Min Kim 1, Yeong Deuk Jo 1 , Si-Yong Kang 2, Jin-Baek Kim 1 , Joon-Woo Ahn 1 and Sang Hoon Kim 1,* 1 Advanced Radiation Technology Institute, Korea Atomic Energy Research Institute, Jeollabuk-do 56212, Korea;
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[email protected] (J.-W.A.) 2 Department of Horticulture, College of Industrial Sciences, Kongju National University, Yesan 32439, Korea;
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[email protected]; Tel.: +82-63-570-3318 Received: 22 July 2020; Accepted: 14 September 2020; Published: 17 September 2020 Abstract: Roses are one of the most important floricultural crops, and their essential oils have long been used for cosmetics and aromatherapy. We investigated the volatile compound compositions of 12 flower-color mutant variants and their original cultivars. Twelve rose mutant genotypes were developed by treatment with 70 Gy of 60Co gamma irradiation of six commercial rose cultivars. Essential oils from the flowers of the 18 genotypes were analyzed by gas chromatography–mass spectrometry. Seventy-seven volatile compounds were detected, which were categorized into six classes: Aliphatic hydrocarbons, aliphatic alcohols, aliphatic ester, aromatic compounds, terpene alcohols, and others. Aliphatic (hydrocarbons, alcohols, and esters) compounds were abundant categories in all rose flowers.