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Genetic Analysis of the Axillary Branched mutant (SbABM) in Sorghum (Sorghum bicolor L. Moench)

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Title Genetic Analysis of the Axillary Branched mutant (SbABM) in Sorghum (Sorghum bicolor L. Moench)
 
Creator Shobha U. Immadi
 
Contributor S.S. Patil
 
Subject Genetics & Plant Breeding
 
Description The progress in rabi sorghum breeding is limited due to narrow genetic diversity.
Studies on somaclonal mutations of sorghum has led to the development of SbABM
(Sorghum bicolour Axillary Branched Mutant) of rabi variety A-1 (Annigeri-1), which bears
multiple panicles. Considering its developmental significance and phenotypic diversity, this
mutant was subjected to detailed genetic and biometrical analysis.
SbABM was compared with ruling rabi variety A-1 and M 35-1 across fertility,
irrigation and plant density regimes. SbABM was found to be more productive than checks.
The number of axillary branches in SbABM was significantly higher than the checks. The
trait expresses irrespective of the levels of fertility and density. The study on penetrance and
expressivity of axillary branching revealed stable expression of the trait (penetrance),
however the degree of expression (expressivity) was found to be variable.
To exploit its breeding potentiality, SbABM was involved in a full diallel study along
with ruling rabi varieties. SbABM performed exceptionally well in hybrid combinations for
all the growth and yield attributing traits. The per se performance and heterosis for
productivity traits of F1 hybrids with SbABM as one of the parent were significantly higher
than other crosses. The most productive hybrids identified were SbABM x M 35-1 and
SbABM x 104B. Combining ability analysis revealed that both gca and sca variances were
significant in determining the inheritance pattern of these traits. The segregation pattern
studied in F2 generation of ten crosses involving SbABM revealed the role of a single
dominant gene for axillary branching. SbABM failed to restore fertility on both milo and
maldandi cytoplasm.
The study on mRNA analysis, revealed that all the four genes studied were present in
both SbABM and A-1. Exogeneous application of growth regulators gave a preliminary
insight into the role of hormones in expression of axillary branching.
 
Date 2016-07-25T14:09:41Z
2016-07-25T14:09:41Z
2012
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/69786
 
Format application/pdf
 
Publisher UAS Dharwad