Indian Society of Genetics & Plant Breeding
Evaluation of a diverse set of 68 specialty corn inbreds
(pop corn, sweet corn and QPM) against stored grain
weevil (Sitophilus oryzae L.) revealed existence of wide
genetic variations for grain weight loss (3.40-41.21%),
number of insect progeny emerged (5.00-76.33),
germination of seeds after infestation (0.00-81.33%),
pericarp thickness (36.18-178.13 µm) and grain hardness
(62.33-600.33 Newton). Pop corn inbreds recorded lowest
mean grain weight loss (8.19%) and number of insect
progeny emerged (9.23) with highest mean germination
(78.28%). Grain weight loss and number of insect progeny
emerged were positively correlated, while both showed
negative correlation with germination percentage.Pericarp
thickness and grain hardness could not contribute to
confer resistance. Based on cumulative resistance index
(CRI), pop corn inbreds were in general more resistant
(mean CRI=1.84) to weevil infestation as compared to
shrunken sweet corn (mean CRI=1.51), sugary sweet corn
(mean CRI=1.26) and QPM (mean CRI=0.76) inbreds.
However, resistant inbreds were also identified in sweet
corn and QPM types that can be utilized effectively as
donors in the resistance breeding programme. The
contrasting inbreds could serve as rich genetic resources
for unravelling the basis of resistance.
Evaluation of a diverse set of 68 specialty corn inbreds
(pop corn, sweet corn and QPM) against stored grain
weevil (Sitophilus oryzae L.) revealed existence of wide
genetic variations for grain weight loss (3.40-41.21%),
number of insect progeny emerged (5.00-76.33),
germination of seeds after infestation (0.00-81.33%),
pericarp thickness (36.18-178.13 µm) and grain hardness
(62.33-600.33 Newton). Pop corn inbreds recorded lowest
mean grain weight loss (8.19%) and number of insect
progeny emerged (9.23) with highest mean germination
(78.28%). Grain weight loss and number of insect progeny
emerged were positively correlated, while both showed
negative correlation with germination percentage.Pericarp
thickness and grain hardness could not contribute to
confer resistance. Based on cumulative resistance index
(CRI), pop corn inbreds were in general more resistant
(mean CRI=1.84) to weevil infestation as compared to
shrunken sweet corn (mean CRI=1.51), sugary sweet corn
(mean CRI=1.26) and QPM (mean CRI=0.76) inbreds.
However, resistant inbreds were also identified in sweet
corn and QPM types that can be utilized effectively as
donors in the resistance breeding programme. The
contrasting inbreds could serve as rich genetic resources
for unravelling the basis of resistance.
Keywords: Storage pest, weevil, resistance, specialty corn, Sitophilus oryzae
Year: 2014
Volume: 74
Issue: Supplementry Issue
Article DOI: 10.5958/0975-6906.2014.00890.6
Print ISSN: 0019-5200
Online ISSN: 0975-6906
R. Zunjare, F. Hossain, N.Thirunavukkarasu,V. Muthusamy info_circle
S. K. Jha info_circle
P. Kumar info_circle
H. S. Gupta info_circle
Download PDF