Breeding of a New Artificial Tetraploid Mulberry Variety Wansangyou 1
Multiple plants with mutagenic shoots were obtained by treating newly sprouted shoots of a diploid mulberry variety 7707 with 0.4％ colchicine plus 3％ dimethyl sulfoxide mixture to induce chromosome doubling.The mutagenic shoots were reproduced through grafting to provide mulberry trees for individual selection,pedigree selection and variety comparative trial.As a result,a new tetraploid mulberry variety with stable traits was obtained,which was approved by the Forest Variety Evaluation Committee of Anhui Province in 2014 and was designated as Wansangyou 1.In regional comparative trial with the control diploid cultivar Husang 32,this newly bred artificial tetraploid mulberry variety had an 18.75％ increase in annual leaf production,a 6.18％ increase in cocoon production,and a 5.63％ increase in cocoon shell weight.Moreover,it showed higher resistance to coldness,mulberry blight disease and mulberry yellow dwarf disease,being a tetraploid mulberry variety with excellent comprehensive traits,high productivity and high resistance suitable for growing in sericultural regions of the Yangtze River Valley.
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