Introduction of a xantha mutation for testing and increasing varietal purity in hybrid rice |
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| Institution: | 1. National Key Laboratory of Rice Biology and Ministerial Key Laboratory for Nuclear Agricultural Sciences, Institute of Nuclear Agricultural Sciences, Zhejiang University, Hangzhou 310029, China;2. College of Life Sciences, Zhejiang University, Hangzhou 310029, China;3. Joint FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, International Atomic Energy Agency, Wagramer Strasse 5, P.O. Box 100, A-1400 Vienna, Austria;1. Laboratory of Entomology, Wageningen University, P.O. Box 16, 6700 AA Wageningen, The Netherlands;2. Koppert Biological Systems, R&D Microbiology, P.O. Box 155, 2650 AD Berkel en Rodenrijs, The Netherlands;3. Molecular Interaction Ecology, Radboud University Nijmegen, Heyendaalseweg 135 6525 AJ Nijmegen, The Netherlands;4. Molecular Interaction Ecology, German Centre for Integrative Biodiversity Research (iDiv), Deutscher Platz 5e, 04103 Leipzig, Germany;1. Cold Spring Harbor Laboratory, 1 Bungtown Road, Cold Spring Harbor, NY 11724, United States;2. USDA-ARS-NEA, Robert W. Holley Center, Ithaca, NY 14853, United States;1. Department of Mathematics and Physics, Catholic University of Brescia, via dei Musei 41, Brescia, Italy;2. Département de Gestion des Ressources Naturelles Renouvelables, Université de Lubumbashi, Democratic Republic of the Congo;1. State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan 430072, China;2. Hubei Key Laboratory of Genetic Regulation and Integrative Biology, School of Life Sciences, Central China Normal University, Wuhan, 430079, China;1. ICAAM— Instituto de Ciências Agrárias e Ambientais Mediterrânicas, Universidade de Évora, Núcleo da Mitra, Ap. 94, 7002-554 Évora, Portugal;2. Departamento de Paisagem, Ambiente e Ordenamento, Escola de Ciências e Tecnologia, Universidade de Évora, Colégio Luis António Verney, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal |
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| Abstract: | A xantha mutant (yellow plant) was induced by gamma rays irradiation of a cytoplasmic male sterile (CMS) maintainer line II32 B of rice (Oryza sativa L.). It was identified earlier as a low gelatinization temperature mutant and named as Mgt-1. Through a series of backcrosses of Mgt-1 to CMS line II32 A, a new CMS line was developed and named as Huangyu A (B). Genetic analysis showed that the xantha mutation was controlled by a single recessive locus, and all F1 plants from crosses of Huangyu A (B) with other normal green varieties showed normal green leaves. The xantha mutation resulted in reduction of photosynthetic pigments content at various levels, e.g., 48% of chlorophyll a (Chl a), 71% of chlorophyll b (Chl b), and 30% of carotenoids (Car), and consequently increased the ratios of Chl a/Chl b and Car/Chl in Huangyu A (B) against II32 A (B). Unexpectedly, Huangyu A (B) had higher photosynthetic rates in comparison with II32 A (B), and so did the F1 plants of Huangyu A/R3027 as against those of II32 A/R3027. Huangyu A had similar male sterility completeness and stability as II32 A, but the former showed significantly better combining ability than the latter. The yellow color made the seedlings and plants of Huangyu A (B) visually distinguishable from the green ones and thus it was a very distinct marker applicable for rapid testing and efficient increasing varietal purity in seed and paddy production of hybrid rice. |
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