INVESTIGADORES
LIJAVETZKY Diego Claudio
artículos
Título:
QTL analysis and mapping of pre-harvest sprouting resistance in sorghum
Autor/es:
LIJAVETZKY, D; MARTINEZ, MC; CARRARI, F; HOPP, HE
Revista:
EUPHYTICA
Referencias:
Año: 2000 vol. 112 p. 125 - 135
ISSN:
0014-2336
Resumen:
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One of the most
important agronomic problems in the production of sorghum [Sorghum bicolor (L.)
Moench] in humid climates is pre-harvest sprouting (PHS). A molecular linkage
map was developed using 112 molecular markers in an F2 mapping
population derived from a cross between IS 9530 (high resistance to PHS) and
Redland B2 (susceptible to PHS). Two year phenotypic data was obtained. By
means of interval mapping analysis, two significant QTL were detected in two
different linkage groups with LOD scores of 8.77 and 4.39. Each of these two
QTL individually explained approximately 53% of the phenotypic variance, but
together, in a two-QTL model, they explained 83% of the phenotypic variance
with a LOD score of 12.37. These results were corroborated by a one-way ANOVA
in which the four flanking markers of the most likely QTL positions displayed
highly significant values in the F-test, and significant variation in
trait expression was associated with marker genotypic classes. The four markers
with highest effect in the one-way ANOVA were also detected in the second year
replication of the F2 population, and significant genotype _ environment interactions was observed. The putative
relationship between PHS resistance in sorghum and the maize Vp1 gene is
also discussed.
