Inentification of Drought Tolerant Germplasm in Maize (Zea mays L.)
KrishiKosh
View Archive InfoField | Value | |
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
|
|