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Title of Journal: Mol Breeding

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Abbravation: Molecular Breeding

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Springer Netherlands

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DOI

10.1007/bf02335503

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ISSN

1572-9788

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Markerassisted breeding of Thai fragrance rice fo

Authors: Yanchang Luo Zhongchao Yin
Publish Date: 2013/06/19
Volume: 32, Issue: 3, Pages: 709-721
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Abstract

Rice is a staple food crop for more than half of the world’s population However rice production is affected by many types of abiotic and biotic stress Genetic breeding by utilizing natural resistance or tolerance genes is the most economic and efficient way to combat or adapt to these stresses Khao Dawk Mali 105 KDML 105 is an elite cultivar of aromatic rice mainly grown in Thailand However the production of KDML 105 is affected by lodging problems due to its tall plant type regular flash floods or shortterm submergence during the monsoon season and diseases such as blast and bacterial blight Here we report the pyramiding of semidwarf gene sd1 submergence tolerance gene Sub1A blast resistance gene Pi9 and bacterial blight resistance genes Xa21 and Xa27 in KDML 105 by markerassisted selection The improved line designated T5105 has a semidwarf phenotype with improved lodging resistance and a greater harvest index T5105 survives after 2 weeks of complete submergence without significant loss of viability T5105 confers high resistance to all five Magnaporthe oryzae isolates tested and provides resistance or moderate resistance to 25 of the 27 Xanthomonas oryzae pv oryzae strains tested In addition T5105 produced higher yield than KDML 105 in two field trials and retains similar good grain quality to KDML 105 The development of T5105 provides a new line to boost the production of highquality aromatic rice in tropical regionsWe wish to thank D Tian K Vilayheuang S Simeuang S Du S Zakaria B Basah and A Endrajaya for technical assistance S Wang for KDML 105 D J Mackill for IR64Sub1ASub1A and G Liu for 751127 This research is supported by Temasek Foundation and the National Research Foundation Singapore under its Competitive Research Programme CRP Award No NRFCRP7201002

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