Abstract
Rice (Oryza sativa L.) plants develop vertically with shoot elongation and horizontally with tillering. The purpose of this study was to identify and characterize genomic regions influencing the rice plant architecture by quantitative trait locus (QTL) analysis for the component traits: culm length (CL), panicle length (PnL), panicle number (PnN) and tiller number (TN). For this QTL analysis, 191 recombinant inbred lines (F7) derived from a cross of Milyang 23 (M23) and Akihikari (AK) were grown in 1995, 1996 and 1997 (May–Oct) in Joetsu, Japan (temperate climate), and in the 2000 dry season (Jan–Apr), the 2000 wet season (Jun–Oct) and the 2001 dry season in Los Baños, The Philippines (tropical climate). Results showed that rice plant architecture was influenced by 19 genomic regions categorized into five groups. In Group I, two regions (on chrs. 6 and 11) affected shoot elongation (CL and PnL) and tillering (PnN and TN) in opposite directions more significantly in Los Baños than in Joetsu. In Group II, two regions (chrs. 3 and 12) affected shoot elongation, whereas in Group III, five regions [chrs. 1 (two), 2, 3 and 9] affected only culm length (CL). Expressions of four regions of Group III were influenced by either tropical or temperate environments. In Group IV, seven regions (chrs. 1, 2, 4, 5, 6, 8 and 9) controlled panicle development (PnN or PnL), and in Group V, three regions (chrs. 1, 2 and 3) regulated tillering (PnN or TN). Characterizing these 19 genomic regions provided a detailed analysis of rice plant architecture with emphasis on the multiple effect and environmental responsive regions.
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Acknowledgments
This study was partly conducted under the IRRI-Japan Collaborative Research Project. The climatic data of Joetsu and Los Baños were kindly provided by Dr. K. Yokoyama, National Agricultural Research Center, and Mr. Nestor Fabellar, IRRI, respectively. We wish to thank Messrs. T. Aota, H. Shimizu and I. Nozaki, HNAES, and Mr. L.A. Ebron, IRRI, for their skilled management of the paddy fields, and Dr. H. Yamagishi, Hokkaido University, for his valuable suggestions on this manuscript.
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Kobayashi, S., Fukuta, Y., Sato, T. et al. Molecular marker dissection of rice (Oryza sativa L.) plant architecture under temperate and tropical climates. Theor Appl Genet 107, 1350–1356 (2003). https://doi.org/10.1007/s00122-003-1388-8
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DOI: https://doi.org/10.1007/s00122-003-1388-8