STABILITY ANALYSIS OF EXPERIMENTAL HYBRIDS FOR SEED YIELD AND ITS COMPONENT CHARACTERS IN SUNFLOWER (Helianthiis animus L.)
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Date
2001-08-07
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK BANGALORE
Abstract
The investigation was undertaken to analyse the stability of 15
experimental hybrids and four checks for seed yield and its component
characters over three locations, viz., Bheemarayanagudi, Bagalkot and
Dharwad during kharif 1998. Stability analysis was carried out by
adopting the model of Eberhart and Russell (1966).
Two-way analysis of variance revealed significant differences
between genotypes and also environments for all the characters except
100 seed weight indicating GxE interactions which was further confirmed
by significant variance due to GxE interactions for all the characters. The
variance due to genotype x environment (linear) were non-significant for
all the characters studied. The mean sum of squares due to pooled
deviations were found to be highly significant for all the seven characters,
indicating predominance of unpredictable portion of GxE interaction.
The overall performance of hybrids over locations revealed that
Dharwad location was the most favourable environment for the expression
of plant height, head diameter and seed yield, while Bagalkot location was
favourable for the expression of characters like 100 seed weight, volume weight
and oil content. Bheemarayanagudi location was favourable for the
expression of early flowering of genotypes.
Taking into consideration the three stability parameters, viz., mean
performance over three locations, regression coefficient (hi) and deviation
from regression (S2di), the single-cross hybrid VRF-21 was rated as the
best for earliness and oil content. PAC-36 ranked first for plant height
over three locations. The single-cross hybrid DSH-255 was found to be the
best for seed yield and head diameter. The hybrid RSH-1 had maximum
100 seed weight, while MSFH-17 recorded maximum volume-weight.
Considering mean performance over three locations, DSH-255 was the
most promising hybrid for seed yield and oil content.
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