Unit 2思维导图
Unit 2课程
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思维导图大纲
Unit 2思维导图模板大纲
Abstract
Finding
association between yield and fibre quality
negative
fibre length and strength
positive
fibre maturity
inconsistent
micronarie and fineness
Suggested breeding strategies
recurrent selection
lines with better fibre and yield
Conclusion
large population size
robust testing
intermating elite lines
Introduction
to broaden the portfolio of upland cotton fibre types for delivery into Asian high-count ring pinning
measured the associations between lint yield and fibre properties of cotton(length,strength,micronaire,linear density,maturity)
strong negative association between fibre properties and yield still exit
it inhibit the development of the elite cultivars competitive
Knowledge of the nature and extent of the association will assist with developing breeding stragies to minimise the yield penalty
Methods
Screening
screen at F3 for fibre quality
advanced to progency rows
screened again for quality and yield
Planting
in rows 100cm apart
inter-row cultivation before flowering
harvested at maturity
Sampling
take 350 subsamplle to determine lint fraction and fibre quality
Processing data
use linear regression to analyze data from US and AUS
determine the association between lint yiel and fibre length,strength,micronaire,fibre maturity and fineness
Results
negative correlation
fibre length
significantly different incercepts
lower slope for the AUS data
higher yielding genotypes with longer fibres in the AUS data
fibre strength
different slopes in AUS data:2008(the greatest),2004(the least)
the same slopes in US data
desirable outlier genotypes:high yield and streghth
weak correlation
the AUS data
a wider range of yield and maturity ratio
different intercept and slopes
2004:genotypes with high maturity ratio and yields
the US data
the same slope
maturity percentage(73-96%)
2004：73-81%
2002:88-96%
Fineness Linear Density
different instruments cause different values
change of slope is similar to micronaire
Discusion
Fibre length
there is a strong correlation between fibre length and yield,but less than fiebre strength
Fibre strength
A direct correlation
between the molecular weight of cellulose and fibre strength
Micronaire,fineness,fibre maturityy
consistency of correlation between yield and various factors
Maturity is greater than fineness or Moronaire
Influence on micronaire
genetic
environment
relationship between Micronaire and yarn strength
Micronaire is beneficial to improve yarn strength
Breeding strategies
Aim:find a strain with the best combination of yield and strength
Way:select high-yeilding strains with excellent fibre quality for hybridization
required in early segregating思维导图模板大纲
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