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ROYAL UNIVERSITY OF BHUTAN
SHERUBTSE COLLEGE
KANGLUNG: BHUTAN
Name: Dawa Tshering
Programme: B
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Life Science
Assignment No: 1
Enrolment No: 07180321
Semester: 5th
Due date: 08/12/2020
Module: BTS306
Submission date: 08/12/2020
Submitted to: Mr
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Chettri
I have read and understood the definition of academic dishonesty as given in the Wheel of Academic Law, RUB,
which is reproduced on the backside of this cover page
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I understand that if found
otherwise, my assignment is likely to be cancelled
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Organization,
structure and
language use
2
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Scientific
research
information
4
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Submission
Signature of Module Tutor
1
Marks
awarded
Criteria for Marking
Max
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1
Contents
Introduction
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3
History of Selection
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5
Procedure for Pure line selection
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6
Second year
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6
Fourth year
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6
Pure-line Selection characteristic
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8
Applications of the pure-lines selection
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9
Conclusion
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11
2
Introduction
3
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This is accomplished by creating various
methodology
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In
unadulterated line determination, improvement of the assortment is exceptionally uniform with the
inclusion of a solitary plant
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Unadulterated line choice is tedious concerning
the improvement of the assortment when contrasted and the mass choice (Samanthi R
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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
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Instead, breeding
becamemoreorderlyasaconsequenceofpurelinetheorywhichstructuredbreedingprogrammesandeli
minatedexternal heritable influences
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, 2017)
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Improvement of
new assortment through identification and confinement of single best plant descendants is known
as unadulterated line choice
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So
Pure line is an enormous number of plants are chosen from self-pollinated crops and are gathered
exclusively
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During the pure line selection process, a large quantity of selfpollinating crop plants is selected and harvested individually
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Since this procedure involves a single crop variety, it is also referred to as individual plant
selection
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Phenotypic differences present within the plants of pure line are
environmental and will not transfer to the next generation
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Pure line plants can
be utilized in order to develop new varieties by hybridization
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The pure line selection
mainly includes three steps; selection of plants (source of mixed population, evaluation of the
progeny and yield trials
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, 2017)
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nana to perform a series of experiments
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The selection of a pure line corresponds to the process of separation of pure line of an
original mixed population
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Individuals of a pure line have the same genotype
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Due to the previous point, the selection within a pure line is not effective
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Variations that appear within a pure line are due to environmental factors
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Present day, all varieties of self-pollinated crops are pure-lines
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According
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Local varieties
2
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Introduced varieties
The pure-line selection has three steps for evolving a variety
1
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2
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Yield trials
History of Selection
The history of plant selection goes back to ancient times where it was practiced by the farmers
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In the year 1843, Le coutier, a farmer
4
of island of New Jersey published his results on selection in wheat and he concluded that the
progenies from single plants were more uniform