Quantitative trait locus analysis for rice panicle and grain characteristics |
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Authors: | E D Redoña D J Mackill |
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Institution: | Philippine Rice Research Institute (PhilRice), Mu?oz, Nueva Ecija 3119, The Philippines, XX USDA-ARS, Department of Agronomy and Range Science, University of California, Davis, CA 95616, USA E-mail: djmackill@ucdavis.edu, US
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Abstract: | The development of molecular genetic maps has accelerated the identification and mapping of genomic regions controlling quantitative
characters, referred to as quantitative trait loci or QTLs. A molecular map derived from an F2 population of a tropical japonica×indica cross (Labelle/Black Gora) consisted of 116 restriction fragment length polymorphism
(RFLP) markers. Composite interval mapping was used to identify the QTLs controlling six panicle and grain characteristics.
Two QTLs were identified for panicle size at LOD>3.0, with one on chromosome 3 accounting for 16% of the phenotypic variation.
Four loci controlling spikelet fertility accounted for 23% of the phenotypic variation. Seven, four, three and two QTLs were
detected for grain length, breadth, shape and weight, respectively, with the most prominent QTLs being on chromosomes 3, 4,
and 7. Grain shape, measured as the ratio of length to breadth, was mostly controlled by loci on chromosomes 3 and 7 that
coincided with the most important QTLs identified for length and breadth, respectively. A model including three loci accounted
for 45% of the phenotypic variation for this trait. The identification of economically important QTLs will be useful in breeding
for improved grain characteristics.
Received: 18 July 1997 / Accepted: 9 December 1997 |
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Keywords: | Quantitative trait locus (QTL) Oryza sativa L Molecular markers Grain dimensions Panicle size |
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