What is the main advantage of pure line selection?
Advantages of Pureline Selection Rapid method, lines are usually genetically fixed and yield trials can be immediately conducted. Plants in such variety react in similar fashion to environmental conditions, means they are uniform in performance and at the same time in appearance too.
What is meant by pure line variety?
Pure line selection is a method in which new variety is developed by selection of single best plant progeny among traditional varieties or land races.
Who proposed pure line selection?
botanist W. L. Johannsen
The concept of pure lines arose from a series of experiments conducted by the Danish botanist W. L. Johannsen in 1903 with the bean cultivar Princess. He investigated the effect of selection on the trait of bean seed weight.
What is a pure line cultivar?
Pure-line refers to the homogenous progeny of a self pollinated homozygous plant. Development of new variety through identification and isolation of single best plant progeny is known as pure-line selection or individual plant selection.
What is a pure line give its main features?
The definition of a pure line is a result of inbreeding where animals or plants have certain characteristics that are the same through generations. An example of a pure line is the result of inbreeding of a certain flower to help it fight off diseases. klondikegj and 3 more users found this answer helpful.
What are the characteristics of pure line?
Characteristics of purelines 1. All plants within a pure line have the same genotype. 2. The variation with in a pureline is environmental and nonheritable.
What are major steps involved in pure line selection?
Main steps in the production of pureline variety are as follows: Selection of individual plants from a local / traditional variety, land races or some other mixed population. Visual evaluation of individual plant progenies. Yield trials.
What is GCA in plant breeding?
Two concepts of general combining ability (GCA) and specific combining ability (SCA) have had important influence on inbred line evaluation and population development in crop breeding. Sprague and Tatum5 defined GCA as the average performance of a genotype in a series of hybrid combinations.
What is pure line theory in plant breeding?
Pureline theory: A pure line is the progeny of a single self fertilized homozygous plant. The concept of pureline was proposed by Johannsen on the basis of his studies with beans (Phaseolus vulgaris) variety called Princess.
Who first established pure line theory?
Wilhelm Johannsen
Abstract. In the early twentieth century, Wilhelm Johannsen proposed his pure line theory and the genotype/phenotype distinction, work that is prized as one of the most important founding contributions to genetics and Mendelian plant breeding.
What is line in plant breeding?
Line breeding is used for plant varieties that usually breed through self-pollination (e.g. barley, wheat, oats and peas). Such plants are fertilized by their own pollen, even before they leave the flowering stage.
Is pure line homozygous?
-The pure line is true-breeding genotypes. It is a line that in successive generations has been made homozygous with all genes under consideration. It is a line in which homozygous individuals only bear homozygous offspring like parents.
What is the genetic basis of pure-line selection?
However, the genetic basis of pure lines was explained by Johannsen, a Danish biologist in 1903. Pure-line refers to the homogenous progeny of a self pollinated homozygous plant. Development of new variety through identification and isolation of single best plant progeny is known as pure-line selection or individual plant selection.
Why is pure line selection called individual plant selection?
In pure line selection, large numbers of plants are selected from a self-pollinated crop and is harvested individually, individual plant progenies from them are evaluated separately and the best one is released as pure line variety. Therefore it is also known as individual plant selection.
What are the steps involved in pure line selection?
Pure-line selection consists of four major steps, viz.: (4) Release of the best pure-line as a variety. An old variety or land race is used for pure-line selection. Single plants are selected from the heterogeneous population keeping in view the objective of selection.
What is a pureline plant?
2. PURELINE SELECTION • INTRODUCTION • A Pureline is the progeny of a single , homozygous , self-pollinated plant.