Genetic Divergence, Character Association and Path Analysis in upland riec (oryza sativa L.)
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Date
1985-08
Authors
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Agricultural Botany Department, N. M. College of Agriculture Gujarat Agricultural University
Abstract
Description
A field experiment consisting of one hundred and ten
~notypes of upland rice was conducted at National Agricultural
?search project, Musa farm, Gujarat Agricultural UniverSity,
during Kharif, 1994 with a view to study genetic
.vergence, character association and path coefficients for grain
.eld and its components.
Analysis of variance revealed significant genotypic
fferences for all the ten characters. A wide range of variation
IS observed for all the characters.
The nature and magnitude of genetic divergence was assessed
:i09 Mahalanobis D2 statistics. The genotypes were grouped into
ne clusters. The clustering pattern revealed no relationship
'tween genetic divergence and geographical distribution. Inter
uster distance and cluster means for varlO• US characters
,dicated that hybridization between genotypes of cluster VII and
II would give more variability in segregating generation. The mgth : breadth ratio and IOO-grain weight contributed maximum
18%) to the total divergence.
Association analysis between grain yield and other •
n~ne
rronomic characters revealed that grain yield per plant had
'.sitive and highly significant correlation with • gralns per
miele, panicle le1Jgth, straw yield and plant height at
lenotyp ic and genotypic levels. Significant and positive
lrrelations were observed between grain yield and length ••
"eadth ratio and protein content. Days to 50% flowering showed
lsitive and high significant correlation with yield at genotypic
~vel. These traits also possessed positive correlation among
lemselves. In view of the positive inter relationship amongst
lese component it could be concluded that simultaneous
Iprovement of yield through the selection of one or another
_eld component would be possible.
Path coefficient analysis indicated highest positive direct
'feet of grains per panicle followed by straw yield per plant,
Inicle length, IOO-grain weight and protein content. In majority
the cases the indirect effects of different components on
'ain yield through grains per panicle and panicle length ..,co ......
'mparable.
Based on these findings, it is suggested that parents having
_irly high to medium genetic diverity may be selected for
'bridization in order to get
.,.".b ~
!./bile L selectin
high heterotic effects and better
combinants. more emphaSis should be gl• ven to
• alns per panicle, panicle length and medium plant height I• n
der to get maximum genetic gain in upland rice.
Keywords
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Citation
BHARAT GAMBHIRSINGH CHHIMPI_29448