Mapping QTLs for root morphology of a rice population adapted to rainfed lowland conditions.

In the rainfed lowlands, rice ( Oryza sativa L.) develops roots under anaerobic soil conditions with ponded water, prior to exposure to water stress and aerobic soil conditions that arise later in the season. Constitutive root system development in anaerobic soil conditions has been reported to have a positive effect on subsequent expression of adaptive root traits and water extraction during progressive water stress in aerobic soil conditions.

Mapping of genes controlling aluminum tolerance in rice: comparison of different genetic backgrounds.

Aluminum toxicity is the main factor limiting the productivity of crop plants in acid soils, particularly in the tropics and subtropics. In this study, a doubled-haploid population derived from the rice ( Oryza sativa L.) breeding lines CT9993 and IR62266 was used to map genes controlling Al tolerance.

Effects of Phenotyping Environment on Identification of Quantitative Trait Loci for Rice Root Morphology under Anaerobic Conditions.

In the rainfed lowlands, rice (Oryza sativa L.) develops roots under anaerobic soil conditions with ponded water, prior to exposure to aerobic soil conditions and water stress. Constitutive root system development in anaerobic soil conditions has been reported to have a positive effect on subsequent expression of adaptive root traits and water extraction during water stress.

Classification of rice germplasm. II. Discrimination of indica from japonica via analysis of amplicon length polymorphisms.

The polymerase chain reaction (PCR) was used to survey DNA sequence variation among 12 indica and 10 japonica rice cultivars. Of the 143 primer pairs used, 37 detected amplicon length polymorphism (ALP) and 11 revealed PCR banding patterns paralleled with the indica/japonica differentiation. Thus the 11 primer pairs were used to discriminate the two rice subspecies.

Development of pre-isogenic lines for rice blast-resistance by marker-aided selection from a recombinant inbred population.

To increase the available set of near-isogenic lines (NILs) for blast-resistance in rice, we have developed a general method for establishing NILs from populations of fixed recombinants that have been used for gene mapping. We demonstrated the application of this method by the selection of lines carrying genes from the rice cultivar Moroberekan. Moroberekan is a West African japonica cultivar that is considered to have durable resistance to rice blast.