Collection of widely divergent germplasms is considered as the source of genetic material and is useful in altering the course of further development.If the genetic variability is lacking,it can be assembled primarily from the primary centres of the origin ofa crop.The variability can also be created through the use of various mutagens to some extent.The breeder can draw the mate- r ial for his use from these gene pools for manipulation of the desired plant type.Seventy-five indigenous and exotic lines that appeared to differ in some quantitative characters contribu ting towards yield were selected from a collection of 400 strains made at the Punjab Agricultural University to estimate the presnce of variability in mung.The observed variability was partition- ed intoits heritable (genetic)and non-heritable(environmental)components.The range,co-effici- ent of genetic variability and expected genetic advance were also determined.The knowledge of these genetic parameters which is lacking in mung would be of immense help in deciding the future course of breeding work.
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