Opinion

Bacterial Blight Quantitative Resistance in Rice (Oryza sativa L.)

Lincoln Mandal¹*, Sunil Kumar Verma², Saugata Sasmal³ and Jawahar lal Katara⁴

¹ Department of Agriculture and Biotechnology, CG, India

² Department of Genetics and Plant Breeding, CARS, India

³ Krishi Vigyan Kendra, IGKV, India

⁴ Department of Plant Biotechnology, National Rice Research Institute, India

Submission: November 30, 2017; Published: February 27, 2018

*Corresponding author: Lincoln Mandal, Department of Agriculture and Biotechnology, CG, Raipur-492012, India.

How to cite this article: Lincoln M, Sunil K V, Saugata S, Jawahar l K. Bacterial Blight Quantitative Resistance in Rice (Oryza sativa L.). Adv Biotech & Micro. 2018; 8(3): 555738. DOI: 10.19080/AIBM.2018.08.555738

Abstract

Bacterial blight disease, caused by Xanthomonas oryzae pv. oryzae (Xoo), is one of the most serious diseases in rice producing areas. The durable and broad resistance of plants was found to be usually governed by multiple genes or quantitative trait loci (QTLs). The quantitative trait loci were mapped for bacterial blight resistance in rice by various researchers almost on all chromosomes. QTLs mapped will facilitate the isolation of novel Bacterial blight resistance genes and their utilization in rice resistance breeding through marker-assisted selection.

Introduction

The Bacterial leaf blight caused by Xanthomonas oryzae pv. oryzae (Xoo) [1,2] is one of the most destructive diseases of rice throughout the world [3]. The presence of complete resistance and partial resistance to Xanthomonas oryzae pv. oryzae in rice has been reported [4,5]. The resistance of rice to specific Xanthomonas oryzae pv. oryzae races is governed by both major R genes with a qualitative effect that condition complete resistance (CR) and polygenes with a quantitative effect (quantitative trait loci, QTL) that condition partial resistance (PR) [6,7]. The durable and broad resistance of plants was found to be usually governed by multiple genes or quantitative trait loci (QTLs) [8].

Quantitative Trait Loci

The Quantitative Trait Loci were mapped for bacterial blight resistance in rice by many researchers using various mapping population [7,9-13] shown in Table 1.

Importance

The QTLs mapped will facilitate the isolation of novel Bacterial blight resistance genes and their utilization in rice resistance breeding [11]. The new information on genes and QTLs for resistance to bacterial blight will be useful for controlling the disease [13]. The molecular mapping of QTL results provide a suitable source of potential disease resistance genes and establish a system for improving rice bacterial blight resistance through marker-assisted selection [12]. The race specificity of partial resistance (PR) and its strong genetic overlap with complete resistance (CR) indicate that partial resistance (PR) is essentially ‘‘weaker’’ complete resistance (CR) [7]. A high level of durable resistance to Xoo may be achieved by the cumulative effects of multiple QTLs, including the residual effects of ``defeated’’ major resistance genes [9].

References

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