Reference "[QTL analysis for epistatic effects and QTL x environment interaction effects on final height of rice (Oryza sativa L.)]"

Reference ID

434

Title

[QTL analysis for epistatic effects and QTL x environment interaction effects on final height of rice (Oryza sativa L.)]

Source

Acta genetica Sinica, 2001, vol. 28, pp. 135-143

Authors (5)

Cao-G-Q	Zhu-J
He-C-X	Gao-Y-M
Wu-P

Abstract

QTLs with epistatic effects and environmental interaction effects for final
height of rice were studied by mixed-model based QTL mapping with a doubled
haploid population from IR64/Azucena in four environments. The results
demonstrated the importance of epistasis as a genetic basis of the quantitative
traits and also revealed several important features of this phenomenon. In the
results, 100 per cent of QTLs were involved in epistasis, of which 64 per cent
were found with significant additive effects. This might mean that the usual
estimates of the QTL additive effects could be confounded by epistatic
interactions and result in biased estimation unless epistatic effect is
separated. The other 36 per cent did not have any significant additive effects
of their own but were involved in 48 per cent of the identified epistatic
interactions. Such loci might play the role of modifying agents that tend to
activate other loci or modify the action of other loci. The other features of
epistasis include as follows: it was fairly common for the same locus to get
involved in interactions with more than one locus; the QTLs with relatively high
magnitude of effects might also be involved in epistasis; and epistasis was
sensitive to environmental interactions for their expression. QTL x environment
(QE) interaction effects were detected more often than QTL main effects for
plant height behavior, as might indicate that gene expression could be greatly
affected by environments.