GENETIC ANALYSIS OF ECONOMIC TRAITS WITH SPECIAL REFERENCE TO ANTHESIS - SILKING INTERVAL IN MAIZE (Zea mays L.)
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Date
2017-11-20
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UNIVERSITY OF AGRICULTURAL SCIENCES GKVK, BENGALURU
Abstract
Moisture stress, especially during the vegetative and reproductive stages limits
the grain yield by about 50 per cent in maize. A wider Anthesis Silking Interval (ASI)
often results from drought stress at flowering. Narrow ASI is associated with drought
tolerance and wider longer ASI is associated with drought susceptibility. An
investigation was undertaken to assess the genetic potential of selected inbred lines
and to identify stable and adaptable heterotic hybrid/s during 2012-2016. The study
revealed ample evidence for the presence of genetic variability among the inbreds for
grain yield and ASI.
Less than unity of GCA/SCA ratio indicated the pre-dominance of nonadditive
gene action governing the traits. The inbred MAI 283 was identified as a
good general combiner. The hybrids MAI-283×KDMI-16, M 04×KDMI 16, BGUDI
88×MAI 394, BGUDI 120×VL 109252 and M 04×BGUDI 89 were identified as
desirable specific combiners for grain yield. The hybrids, MAI-349×BGUDI-118,
MAI-283×KDMI-16 and BGUDI-120×VL-109252 were found significantly superior
to standard checks Hema and CP 818 for grain yield and ASI in desirable direction.
Out of 380 single cross hybrids eight were selected and evaluated at three
locations during rabi 2016 to identify stable and adaptable heterotic hybrid/s. The
AMMI analysis of variance revealed significant contribution of hybrid, location and
hybrid × location (GLI) interaction to variation in all the traits. The hybrids MAI
283×KDMI 16 for ASI and KDMI 16×BGUDI 118 for grain yield were found to have
wider adaptation across the locations.
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