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Recent Progress of Clubroot Resistance Breeding Through Marker-assisted Selection in Brassica Rapa and Brassica Oleracea

MA U Doullah*
Department of Plant Pathology and Seed Science, Sylhet Agricultural University, Sylhet-3100, Bangladesh

H Tomita
Graduate School of Science and Technology, Niigata University, Niigata, Japan

M Shimizu
Graduate School of Science and Technology, Niigata University, Niigata, Japan

S Matsumoto
NARO Institute of Vegetable and Tea Science (NIVTS), Mie, Japan

RFujimoto
Graduate School of Science and Technology, Niigata University, Niigata, Japan

K Okazaki
Graduate School of Science and Technology, Niigata University, Niigata, Japan

Abstract/ Executive Summary:

Clubroot disease (Plasmodiophora brassicae) is one of the most damaging diseases of vegetable Brassica in the world. Different research groups from various countries of the world have identified eight club root resistance (CR) loci; Crr1, Crr2, Crr3, Crr4, CRa, CRb, CRc and CRk in Brassica rapa and twenty seven geneticloci encoding CRinB. oleraceaby Quantitative Trait Loci (QTLs) analysis till now. Some CRloci are located in the near position of the same chromosome and others aredistributed in different chromosomes. The current status of knowledge of clubroot resistance genes considering the future prospects for the development of CR resistant cultivars only are reviewed. The article provides relevant reviews on the clubroot resistant genes and their accumulation through Marker-assisted selection (MAS) inboth B. oleraceaandB. rapa.

Keywords: Brassica crops, Clubroot disease, Plasmodiophora brassicae, Resistancegene, MAS

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Program Area: Pest Management

Commodity: Diseases

Objectives:

In the following paragraphs, this article has provided recent information about CR resistance genes which are indispensible for CR breeding because it allows the acquisition of higher resistance by combining different resistance genes.

Methodology:

This study included the following topics and sub-topics: Breeding and identification of CRloci in Brassica rapa, Breeding and identification of CRloci in Brassica oleracea, Accumulation of CR genes in Brassica rapacrops, Accumulation CR genes in B. oleraceacrops, Marker-assisted Selection (MAS) in clubroot disease, Conclusion and Perspectives.

Source of Information: J. SylhetAgril. Univ.1(2):139-146,2014 ISSN:2308-1597

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Achievement/Findings:

The best strategy to prevent or limit the extent of the infection is the development of genetic resistance. MAS could assist the incorporation of durable clubroot resistance (CR) into cultivars. The effectiveness for controlling disease, combinations of various CR-genes which were selected by using the DNA markers closely associated with each CR-QTL are very much useful. DNA markers detecting CRloci will be very useful for pyramiding CR-genes in Brassica with polygenic in nature. Uses of these markers developed by different CR researchers are good achievement for CR breeding. Accumulations of CR-genes through MAS strengthen resistance and consequently, confer resistance to the multiple pathotypes of Plasmodiophora brassicae in Brassica crops. It is likely that increased durability will be conferred by the pyramiding of the resistance genes. Specific primer sequences of a number of DNA markers linked to CR-genes are now available for clubroot resistance.

Knowledge Management: Journal