Are breeding techniques of plants effect on existing old varieties ?

or:Are breeding techniques of plants effect on existing old varieties ?or:yes there is the old may change to better but may sacrifices some of its go

or:Are breeding techniques of plants effect on existing old varieties ?

or:yes there is the old may change to better but may sacrifices some of its good characteristic. For example in rice grain they do breeding to the old ones to make it water resistant when there is floods but in the process the quality of the rice grain will suffer

Tags:plant,