AOBPreview originally published online on December 1, 2004
Annals of Botany 2005 95(3):423-429; doi:10.1093/aob/mci039
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Annals of Botany 95/3 © Annals of Botany Company 2004; all rights reserved
Comparison of QTL Controlling Seedling Vigour under Different Temperature Conditions Using Recombinant Inbred Lines in Rice (Oryza sativa)
1 Key Laboratory of the Education Ministry of China for Plant Developmental Biology, College of Life Sciences, Wuhan University, Wuhan 430072, China and 2 Department of Plant Pathology, The Pennsylvania State University, University Park, PA 16802, USA
* For correspondence. E-mail zhuyg{at}public.wh.hb.cn
Received: 28 June 2004 Returned for revision: 17 August 2004 Accepted: 11 October 2004 Published electronically: 1 December 2004
• Background and Aims Seedling vigour is one of the major determinants for stable stand establishment in rice (Oryza sativa), especially in a direct seeding cropping system. The objectives of this study were to identify superior alleles with consistent effects on seedling vigour across different temperature conditions and to investigate genotype x environmental temperature interactions for seedling vigour QTL.
• Methods A set of 282 F13 recombinant inbred lines (RILs) derived from a rice cross were assessed for four seedling vigour traits at three temperatures (25 °C, 20 °C and 15 °C). Using a linkage map with 198 marker loci, the main-effect QTL for the traits were mapped by composite interval mapping.
• Key Results A total of 34 QTL for the four seedling vigour traits were identified. Of these QTL, the majority (82 %) were clustered within five genomic regions, designated as QTL qSV-3-1, qSV-3-2, qSV-5, qSV-8-1 and qSV-8-2. All of these five QTL had small individual effects on the traits, explaining 3·1–15·8 % of the phenotypic variation with a mean of 7·3 %. QTL qSV-3-1, qSV-3-2 and qSV-8-1 showed almost consistent effects on the traits across all three temperatures while qSV-5 and qSV-8-2 had effects mainly at the ‘normal’ temperatures of 20 °C and 25 °C. Among the five QTL identified, all and four showed additive effects on shoot length and germination rate, respectively. The contributions of these five QTL to shoot length and germination rate were also much larger than those to the other two traits.
• Conclusions A few of genomic regions (or QTL) were identified as showing effects on seedling vigour. For these QTL, significant genotype x environmental temperature interactions were found and these interactions appeared to be QTL-specific. Among the four seedling vigour traits measured, shoot length and germination rate could be used as relatively good indicators to evaluate the level of seedling vigour in rice.
Key words: Rice (Oryza sativa L.), recombinant inbred line (RIL), seedling vigour, paper-roll tests, quantitative trait loci (QTL), genotype x environment interaction
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