Volume 30 Number 3 Article 4 Pages: 80-81
Year 1976 Month 7
Title: An efficient method of Screening Peaches
Authors: D.W. Cain and R.L. Andersen
Citation
Abstract:
A singel peach genotype (Prunus persica Batch. 'Redhaven') was used to study non-genetic woord hardiness variation.
Tissue browning was used to evaluate injury.
Each of several randomy chosen trees were divided into eight sectors.
The upper south-west and lower northeast sectors were sampled.
Twigs were removed from within each sector and were artificially
cially frozen.
After thawing, they
were cut into base, middle and tip
sections.
Each section was given a
1 to 5 rating dependent on the extent
of tissue browning.
Analysis of variance revealed significant
hardiness differences among
twig sections, tree sectors and between
trees.
Examination of variance
components indicated that trees and
tree x sector interaction constitute
only a small portion of the total random
variation.
Twigs and residual error
accounted for 570;0 to 95% of the
total random variation.
The browning
rating system had a repeatability
of .79.
An estimate of the variance was
used to determine sample sizes needed
to detect hardiness differences of a
desired magnitude.
Differences of 1.0
to .75 browning units could be detected
using a sample of 5 to 10 twigs.
It is suggested that sampling uniformly
from one location within all
trees and within one part- of all twigs
would eliminate a considerable
amount of non-genetic variation.
The
upper southwest sector contains more
twigs and is more uniform than the
lower northeast sector.
Tissues in the
base twig sections were more differentiated
and were easier to rate
than the middle and tip sections.
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