Question

Definition of primary and secondary plant introduction

Answer 1

Primary introduction:

When the introduced variety is well suited to the new environment and is directly released for commercial cultivation without any change the original genotype, known as primary introduction

Secondary introduction:

Introduction that can be used as a variety after selection from the original genotype or used for transfer of some desirable gene to the cultivated variety is known as secondary introduction.

Answer 2

Answer:

In accordance to Bennett (1965). Introduction of the wild plants into the cultivation and the successful transfer of cultivators with their genotype in an unaltered manner, to new environment is known as Primary Plant Introduction and the rest is known as Secondary Plant Introduction.

Primary Introduction:- It is a commercial cultivation as a variety without change in its original genotype is known as Primary Introduction. There are a number of corpse in which direct use of this introduced material has been successfully held. For example Sonora 67, Lerma Rojo. The primer introduction is also known as Direct Introduction as it can immediately added to the changed environment.

Secondary Introduction:- It can be used as a  variety to transfer some desirable gene after selection from some original genotype to the cultivated variety is known as Secondary Introduction. It is more commonly used than primary introduction. It is also known as Indirect Introduction as it takes some years to adapt itself according to the new environment. Some examples of secondary introduction in wheat are Kalyan Sona and Sonalika.