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Generation mean analysis of resistance to downy mildew in adult muskmelon plants

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Title Generation mean analysis of resistance to downy mildew in adult muskmelon plants
Not Available
 
Creator K. T. Shashikumar • M. Pitchaimuthu • R. D. Rawal
 
Subject Cucumis melo Downy mildew Pseudoperonospora cubensis Generation mean analysis Quantitative resistance Dominance
 
Description Abstract Downy mildew (Pseudoperonospora cub ensis) is the most devastating disease in muskmelon
(Cucumis melo). A generation mean analysis study
was designed to determine the types of gene action
and estimate the heritability for resistance to downy
mildew in four selected crosses of muskmelon.
Generation mean analysis revealed that genetic
dominance may be of greater importance for expres sion of resistance to downy mildew in both green house and field experiments and in all the crosses.
The F1 mean was significantly lesser than the mid parent value and skewed towards resistant parent in
all the crosses. Negative sign associated with gene
effects indicated, in those crosses, that disease level
could be decreased in relation to midparent. All the
crosses expressed significant and positive additive (d)
gene effects. Dominance (h) and dominance 9 dom inance (l) gene effects had opposite sign in all crosses
and both experiments, which implied duplicate type
of gene action. High mid-parent heterosis in all the
crosses indicated strong dominance effects (as combi nation of parental alleles) for resistance to downy
mildew. In all the crosses, both resistant and suscep tible parent contributed one or more dominant/partially
dominant factors for resistance. Estimates of broad sense heritability were high and relatively consistent in
both experiments. The two different screening exper iments showed that fixable gene effects (d ? i) were
lower than the non-fixable gene effects (h ? l) in all
the crosses indicating greater role of non-additive
effects in the inheritance of resistance to downy
mildew. Resistance to downy appeared to be controlled
mainly by dominance effects, therefore the inbred lines
IIHR 121 and IIHR 122 could be used strategically to
exploit heterotic effects.
Not Available
 
Date 2021-07-29T09:39:17Z
2021-07-29T09:39:17Z
2010-02-02
 
Type Recording, acoustical
 
Identifier 14
Not Available
DOI 10.1007/s10681-010-0132-0
http://krishi.icar.gov.in/jspui/handle/123456789/51114
 
Language English
 
Relation Not Available;
 
Publisher Springer Science+Business Media B.V.