Table 1.

Overview of rice genetic resources useful for drought research and breeding.

Specialized genetic stock	Feature	Produced and accessible at
Chromosomal segment substitution lines (CSSL)	Two sativa × glabberima libraries Four wild interspecific libraries using different wild rice relatives Four japonica × indica libraries	Centro Internacional de Agricultura Tropical; International Center for Tropical Agriculture (CIAT) National Institute of Agrobiological Sciences (NIAS), Japan
Recombinant inbred lines [tolerant × sensitive, including doubled haploid (DH) lines]	Approximately six commonly used populations	IRRI, Institut de recherche pour le développement (IRD), France
Breeding populations	Advanced lowland and upland breeding lines, new rice for Africa (NERICA) series	IRRI, WARDA (Africa Rice Center)
Introgression lines	glabberima × sativa	CIAT, IRRI, WARDA
Near-isogenic lines	Derived from breeding populations evaluated under field conditions	IRRI
Mutants	Insertions/activations/deletions	Multiple institutions with different degrees of accessibility. Materials can be requested from individual institutions through Standard Material Transfer Agreements

Source: Information assembled from discussion sessions at the Third Annual Research Meeting of the Generation Challenge Programme (GCP), 16 September 2007, Johannesburg, South Africa.