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Inentification of Drought Tolerant Germplasm in Maize (Zea mays L.)

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Title Inentification of Drought Tolerant Germplasm in Maize (Zea mays L.)
 
Creator Prakash H. Kuchanur
 
Contributor P.M. Salimath
 
Subject Genetics & Plant Breeding
 
Description An investigation was carried out to assess the drought tolerance of inbred
lines, hybrids and populations besides studying combining ability and variance with
respect to drought tolerance traits and effect of combining different sources of drought
tolerance.
Eighty two inbred lines, 10 commercial hybrids and seven populations were
screened for drought tolerance during rabi/summer 2007-08 under stress and
nonstress situations. Form this study, six inbred lines, four hybrids and four
populations tolerant to drought were identified based on grain yield, cobs per plant,
anthesis to silking interval and drought susceptibility index.
Sixty six hybrids produced by utilizing 12 inbred lines varying for drought
tolerance were evaluated along with parents and check under stress and nonstress
during rabi/summer 2008-09 and 2009-10. The combined data of two years under
stress and nonstress was analyzed separately as per Griffing’s (1956) model-1 and
method-2 extended by Singh (1973). Combining ability analysis indicated that
variances due to GCA and SCA were significant for most of the traits under both the
situations indicating the importance of both additive and non-additive gene action in
controlling the traits.
The gca status of parents revealed that CI4 and HydSel 15 as good general
combiners among 12 inbred lines under both nonstress and stress situations for
morphological, yield and yield related and physiological traits. The hybrids viz.,
CM111 x NEI9202B, KDMI15 x NEI9202B and HydSel 4 x NEI9202B exhibited
high sca status and highly significant positive heterosis over mid parent for grain yield
(kg/ha) under both the environments.
When derivatives obtained by crossing different sources of drought tolerance
were evaluated, DT inbred x DT inbred recorded higher mean grain yield under stress
and more number of crosses with positive scores as compared to DT hybrid x DT
inbred, DT population x DT inbred and DT population x DT population crosses.
 
Date 2016-07-25T10:38:29Z
2016-07-25T10:38:29Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69665
 
Format application/pdf
 
Publisher UAS Dharwad