Stable quantitative trait locus (QTL) for sheath blight resistance from rice cultivar CR 1014
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Stable quantitative trait locus (QTL) for sheath blight resistance from rice cultivar CR 1014 Archana Bal . Pankajini Samal . Mridul Chakraborti . Arup Kumar Mukherjee . Soham Ray . Kutubuddin A. Molla . Lambodar Behera . Rashmita Samal . Sarmistha Sarangi . Pritiranjan Sahoo . Motilal Behera . Srikanta Lenka . T. P. Muhammed Azharudheen . Ansuman Khandual . Meera Kumari Kar
Received: 11 May 2020 / Accepted: 19 September 2020 Ó Springer Nature B.V. 2020
Abstract Sheath blight disease of rice causes substantial crop losses and resistance sources are rare. A moderately resistant genotype CR 1014 was identified and hybridized with highly susceptible genotype Swarna-Sub1. In the F2 and F2:3 generations, three QTLs (qShB-1.1, qShB-1.2 and qShB-1.3) were mapped in chromosome-1. In F5 generation of the same cross and F4 generation of an alternative mapping population (Tapaswini/CR 1014), only the major QTL qShB-1.1 was recorded consistently with high LOD score ([ 5.0). This stable QTL was colocalized with qShB1 reported earlier from Oryza nivara. A typical leucine rich repeat (LRR) motif containing gene (LOC_Os01g65650) and a chitininducible gibberellin-responsive protein coding nonLRR gene (LOC_Os01g65900) located within qShB-
Archana Bal, Pankajini Samal and Mridul Chakraborti have contributed equally for the work.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10681-020-02702-x) contains supplementary material, which is available to authorized users. A. Bal P. Samal M. Chakraborti A. K. Mukherjee S. Ray K. A. Molla L. Behera R. Samal S. Sarangi P. Sahoo M. Behera S. Lenka T. P. M. Azharudheen A. Khandual M. K. Kar (&) ICAR-National Rice Research Institute, Cuttack, Odisha 753006, India e-mail: [email protected]
1.1 with high expression levels in leaf and shoot were predicted as putative candidate genes among others. Nearly 27.8% reduction in relative lesion height was recorded among several near isogenic lines of SwarnaSub1 carrying the QTL region from CR 1014. Keywords Disease resistance Horizontal resistance Near isogenic lines Novel source Rhizoctonia solani
Introduction Nearly half of the people living in different continents of the world consume rice as their major staple food. The two most populous countries (India and China) of the world are inhabited by people who depend mainly on rice for meeting the calorie requirements. As the crop is grown in highly diverse ecosystems ranging from below mean sea levels to mountains and semiarid to humid climates, the challenges for growing rice are also diverse. To ensure food security, it is of utmost need to develop rice varieties that not only possess higher yield potential, but also tolerate the dynamic and ever evolving biotic stresses. Due to climate change and other factors, many pests which were hitherto considered as minor have evolved as major threat for the crop. Sheath blight (ShB) of rice caused by the fungus Rhizoctonia sol
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