EARLY GENERATION SELECTION FOR YIELD AND ITS COMPONENTS IN CHICKPEA (Cicer arietinum L.)
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Date
2012-06
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Abstract
For maximum efficiency and progress in breeding for
chickpea, it would be advantageous if effective selection could be
carried out in as early a generation as possible so that only best
lines would be retained for further testing. Five populations of
chickpea were formed by involving seven parents. Ten F2 plants
from each of these crosses were selected for high as well as for
low expression of pods per plant, seeds per plant, harvest index
and seed yield per plant. The F3 lines from 226 selected F2 plants
were grown in randomized block design with three replications.
Results revealed that selection for high level had maintained
their higher expression for pods per plant, seeds per plant and
seed yield. Increasing of CV values in F3 as compared to F2
generation usually not expected, may be due to the predominant
repulsion phase linkage. Correlations among pods per plant,
seeds per plant and seed yield from F2 generation to derived F3
lines of them were increased as the generation was advanced.
Realized heritability estimates were inconsistent and
cross dependent. Low heritability coupled with low genetic
advance and inconsistent correlations of F2/F3 generations for
the selection criterion indicated the influence of environment on
the effectiveness of selection.
Selection for improvement of seed yield using pods
per plant was found effective as significant yield difference
between high and low level of this trait was observed in all the
crosses. However, its effectiveness may be considered as
moderately successful because of 40% of high yielding F3
progenies were derived from F2 plants with high pod number. In
contrast, selection for other components and seed yield itself
showed significant yield advantage in certain situations,
however, it could not be recommended as routine procedure.
There was no definite pattern for identification of
superior yielding lines through selection of yield and its
components. Some superior yielding lines were identified by
selection for all the traits, whereas, some superior progenies
were obtained even in the absence of high expression of all the
traits.
It is concluded that while gain in yield can be
achieved by selecting for high pod number in early generation, a
foremost consideration needs to be the influence of environment
on the effectiveness of selection.
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Keywords
CHICKPEA