Soybean rust severity, rate of rust development, and tolerance as influenced by maturity period and season

Studies were conducted in Uganda for three consecutive seasons to evaluate soybean lines of different maturation periods against rust. All the lines were highly susceptible to rust with only two lines graded as moderately resistant: TGx 1835-10E (early maturing) and TGx 1838-5E (late maturing). Thes...

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Bibliographic Details
Published in:Crop protection 2004-05, Vol.23 (5), p.447-455
Main Authors: Kawuki, R.S., Tukamuhabwa, P., Adipala, E.
Format: Article
Language:English
Subjects:
crop yield
cultivars
disease resistance
disease severity
germplasm screening
Glycine max
lines
maturity groups
Maturity period
pedigree
Phakopsora pachyrhizi
plant age
rust diseases
Rust tolerance
seasonal variation
Soybean
soybeans
Uganda
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Summary:Studies were conducted in Uganda for three consecutive seasons to evaluate soybean lines of different maturation periods against rust. All the lines were highly susceptible to rust with only two lines graded as moderately resistant: TGx 1835-10E (early maturing) and TGx 1838-5E (late maturing). These two lines were consistently associated with non-sporulating lesions. Within each maturation group, soybean lines differed significantly in rates of rust development (RRDs), rust severities at R6 growth stage, and yielding ability under rust stress. Most of the lines had RRDs higher than the local check. However, it was only the early maturing lines that yielded higher than the local check. Higher levels of rust tolerance were observed in the early maturing lines (yields >1000 kg/ha), and lowest in late maturing lines (yields
ISSN:0261-2194
1873-6904
DOI:10.1016/j.cropro.2003.09.016