Reference "Mapping QTLs for defective female gametophyte development in an inter-subspecific cross in Oryza sativa L."

Reference ID

7819

Title

Mapping QTLs for defective female gametophyte development in an inter-subspecific cross in Oryza sativa L.

Source

Theoretical and applied genetics, 2001, vol. 102(8), pp. 1243-1251

Authors (4)

Liu-Y-S	Zhu-L-H
Sun-J-S	Chen-Y

Abstract

The embryo-sac is an essential structure for angiosperm reproduction. The
cytological and genetic characterization of embryo-sac sterility was examined in
a cross between Oryza sativa ssp. indica cv. ZYQ8 and ssp. japonica cultivar,
JX17. The arrest of embryo-sac development was manifested following meiosis in
the F1 hybrid. When the megaspore carried the lethal genotype, the nucleus
either failed to divide or divided only once, and the immature embryo-sac
degenerated. Abortion of the embryo-sac in the indica-japonica hybrid background
was not observed in their original parents, and an effect of cytoplasmic gene(s)
on embryo-sac sterility in the reciprocal F1 hybrids was not detected. Using a
rice molecular linkage map based on a doubled haploid (DH) population from the
cross of ZYQ8 /JX17, we mapped quantitative trait loci (QTLs) for the defective
development of the female gametophyte in backcross progenies from the DH lines.
The result demonstrated that a polygenic system is involved in both
megagametogenesis and postzygotic isolation in inter-subspecific hybrid rice.