S. Stamatov*, K. Uzundzhalieva, E. Valchinova, G. Desheva, P. Chavdarov, B. Kyosev, T. Cholakov, R. Ruseva, N. Velcheva Institute of Plant genetic Resources „Konstantin Malkov”, 2 Druzhba, 4122 Sadovo, Bulgaria (Manuscript received 7 June 2017; accepted for publication 25 August 2017)
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