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Mechanisms and genetic diversity for host plant resistance to spotted stem borer, Chilo partellus in sorghum, Sorghum bicolor

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Relation http://oar.icrisat.org/102/
http://dx.doi.org/10.1111/j.1439-0418.2011.01647.x
10.1111/j.1439-0418.2011.01647.x
 
Title Mechanisms and genetic diversity for host plant resistance to
spotted stem borer, Chilo partellus in sorghum, Sorghum
bicolor
 
Creator Singh, B U
Sharma, H C
Rao, K V
 
Subject Sorghum
 
Description Levels of resistance to spotted stem borer, Chilo partellus, in the germplasm
are low to moderate and therefore we evaluated 25 sorghum
genotypes for resistance to stem borer to identify lines with diverse
mechanisms of resistance to this insect. Leaf glossiness was significantly
and negatively associated with low deadheart formation. Dwarf genotypes
with fewer nodes showed more deadheart formation. Antixenosis
and/or antibiosis for leaf feeding, and reduced deadheart formation, tunnelling,
and number of exit holes resulted in lower losses owing to
C. partellus damage. Axillary tillers compensated for loss in grain yield
owing to borer infestation as a result of deadheart formation, but their
synchrony for maturity with the main plant is quite important. Path
coefficient analysis revealed that direct effects of stem tunnelling on loss
in grain yield were greater than leaf feeding and deadhearts. However,
leaf feeding via stem tunnelling showed maximum indirect effects on
loss in grain yield. Estimates for broad-sense heritability and genetic
advance suggested that it is possible to improve for grain yield under
stem borer infestation. Heritability estimates for grain yield were usually
higher than for stem borer damage parameters. Multi-trait cluster analysis
placed the test genotypes into four and five clusters in rainy and
post-rainy seasons, respectively. The genotypes placed in different
groups, and showing resistance to leaf feeding, deadheart formation,
stem tunnelling, and/or compensation in grain yield can be used for sorghum
improvement.
 
Publisher Blackwell Publishing
 
Date 2012
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
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Identifier http://oar.icrisat.org/102/1/SB_Mech_Div_JEN_11_%282%29.pdf
Singh, B U and Sharma, H C and Rao, K V (2012) Mechanisms and genetic diversity for host plant resistance to spotted stem borer, Chilo partellus in sorghum, Sorghum bicolor. Journal Of Applied Entomology, 136 (5). pp. 386-400.