Reference "Physiological and genetic mapping study of tolerance to root-knot nematode in rice"

Reference ID

45555

Title

Physiological and genetic mapping study of tolerance to root-knot nematode in rice

Source

The New phytologist, 2007, vol. 176, pp. 665-672

Authors (4)

Shrestha-R	Uzzo-F
Wilson-M-J	Price-A-H

Abstract

The root-knot nematode Meloidogyne graminicola is an obligate biotrophic
parasite and a major pest of rice (Oryza sativa) for which resistant varieties
are not currently available. Quantitative trait loci (QTLs) for partial
resistance to M. graminicola were identified using a mapping population based on
two rice varieties, Bala x Azucena. Experiments were carried out to investigate
the interactions between M. graminicola and these two varieties in terms of
nematode establishment, reproduction and effect on rice yield. Nematode
establishment was also assessed in the mapping population. Meloidogyne
graminicola consistently caused more galling and had higher reproductive success
in Azucena than in Bala. M. graminicola did not significantly reduce yield in
Bala, but caused a yield reduction of almost half in Azucena, suggesting that
the partial resistance to nematode establishment was related to nematode
tolerance. A total of six significant or putative QTLs for nematode tolerance
were detected. For two of the QTLs detected, Azucena was the donor of the
tolerance alleles, suggesting it may be possible to breed plants with greater
tolerance than Bala.