EFFICIENCY OF SELECTION METHODS IN EARLY SEGREGATING GENERATION OF RICE (Oryza sativa L.) CROSSES
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Date
2018
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Birsa Agricultural University, Ranchi, Jharkhand-6
Abstract
The experimental material consisted of three crosses viz; BG102/BPT5204,
BG102/Naveen and BG102/Reshmi (Commercial Pvt. Hybrid Victory seeds) of rice
(Oryza sativa L.), each of the crosses represented a separate experiment. These F2
selected plants were grown at rice experimental area, Birsa Agricultural University,
Kanke, Ranchi, during kharif, 2014 in RBD with two replication and two methods of
sowing such as direct seeded and transplanted at twenty days interval; each plot
measuring 2.7 x 0.4 meter size. ANOVA revealed that mean sum of square due to
progeny of crosses viz; Cross-I, Cross-II of F3 under different selection group followed
by two dates of sowing for all most all traits were highly significant except for traits PH
and GYP plot while in Cross-III, all characters were found highly significant except GPP
in Ist date of TP under HY group indicating the presence of ample amount of genetic
variability among progenies for all characters under study.
Cross- I
High h2 coupled with low genetic advance as per cent of mean had recorded for
traits DFF in MTL as well as RPS group, which indicated the involvement of nonadditive
gene action. For trait GPP recorded high h2 coupled with high GA as per cent of
mean in Ist and 2nd date of DS under HY group whereas high GA along with moderate h2
was obtained in both date of sowing under same selection method indicating the
preponderance of additive gene action. Average selection response for all the studied
traits had exhibited maximum in LY followed by HY and RPS selection method. In early
generation of selection based on the LY criteria as well as high realized h2 would be most
effective.
Cross- II
Maximum standardized selection response was observed for all studied traits
under HY selection method followed by LY selection method, RPS and MTL, while high
magnitude of standardized selection differential was recorded under HY followed by
RPS, LY and MTL selection method. High realized h2 was observed in different methods
of sowing for all the characters under all methods of selection however as revealed by
the table based on the HY selection method would be more effective.
Cross- III
F3 progenies exhibited high h2 coupled with high GA as per cent of mean for
traits viz; TW, GYP plant and GYP plot in all selection method as well as both date of
planting indicating the preponderance of additive gene action suggesting that selection
may be effective for these characters in early generation. Suggesting that under normal
TP condition in Ist and 2nd method of selection for HY and LY both traits TW and PH
may be considered as an important trait for improving the yield potential of rice. Over all
methods of selection viz; HY, LY, MTL and RPS for all the studied traits like PPP, GPP,
TW and GYP except for DFF as well as PH indicated that based on these characters
selection in F2 would be fruitful. Highest standardized selection response was obtained
based on HY followed by RPS and MTL while high magnitude of standardized selection
differential was recorded under HY selection method followed by RPS, MTL and LY for
all most all the studied traits.
Description
EFFICIENCY OF SELECTION METHODS IN EARLY SEGREGATING GENERATION OF RICE (Oryza sativa L.) CROSSES
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