Record Details

Evaluation of sorghum germplasm used in US breeding programmes for sources of sugary disease resistance

OAR@ICRISAT

View Archive Info
 
 
Field Value
 
Relation http://oar.icrisat.org/5072/
http://dx.doi.org/10.1046/j.1365-3059.2001.00636.x
 
Title Evaluation of sorghum germplasm used in US breeding programmes for sources of sugary disease resistance
 
Creator Dahlberg, J A
Bandyopadhyay, R
Rooney, L W
Odvody, G N
Madera-Torres, P
 
Subject Sorghum
 
Description Ergot or sugary disease of sorghum has become an important constraint in North and South American countries that
rely on F1 hybrid seeds for high productivity. The objective of this research was to determine the vulnerability of
various germplasm sources and publicly bred sorghum lines to sugary disease (Claviceps africana) in the United
States. Flower characteristics associated with sugary disease resistance were also studied. A-/B-line pairs, R-lines,
putative sources of resistance and their hybrid combinations with an A3 cytoplasmic male-sterile source were
evaluated using a disease incidence, severity, and dual-ranking system. Trials were planted in a randomized complete
block design with three replications and repeated in at least two planting dates. Planting dates and pedigrees had
significant effects on overall ranking for resistance. A-lines were most susceptible to sugary disease. R-lines were
more susceptible than B-lines with respect to incidence and severity of the disease. Newer releases of A- and B-lines
were more susceptible to sugary disease than older releases. Sugary disease reaction of A-lines was a good indicator of
disease reaction of B-lines. Tx2737, a popular R-line, was highly susceptible to sugary disease in spite of being a good
pollen shedder because the stigma emerged from glumes 2±3 days before anthesis. The combination of flower
characteristics associated with resistance were least exposure time of stigma to inoculum before pollination, rapid
stigma drying after pollination, and small stigma. An Ethiopian male-fertile germplasm accession, IS 8525, had good
levels of resistance. Its A3 male-sterile hybrid had the highest level of resistance in the male-sterile background. IS
8525 should be exploited in host-plant resistance strategies.
 
Publisher Blackwell Publishing
 
Date 2001
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Rights —
 
Identifier http://oar.icrisat.org/5072/1/PlantPathol50%286%29681-689.pdf
Dahlberg, J A and Bandyopadhyay, R and Rooney, L W and Odvody, G N and Madera-Torres, P (2001) Evaluation of sorghum germplasm used in US breeding programmes for sources of sugary disease resistance. Plant Pathology, 50 (6). pp. 681-689. ISSN 1365-3059