Blast Resistance in Indian Rice Landraces: Genetic Dissection by Gene Specific Markers

Overview

Journal PLoS One

Specialties General Medicine
Science

Date 2019 Jan 24

PMID 30673751

Citations 15

Authors

Manoj Kumar Yadav

S Aravindan

Umakanta Ngangkham

S Raghu

S R Prabhukarthikeyan

U Keerthana

B C Marndi

Totan Adak

Susmita Munda

Rupesh Deshmukh

D Pramesh

Sanghamitra Samantaray

P C Rath

Affiliations

Soon will be listed here.

Abstract

Understanding of genetic diversity is important to explore existing gene in any crop breeding program. Most of the diversity preserved in the landraces which are well-known reservoirs of important traits for biotic and abiotic stresses. In the present study, the genetic diversity at twenty-four most significant blast resistance gene loci using twenty-eight gene specific markers were investigated in landraces originated from nine diverse rice ecologies of India. Based on phenotypic evaluation, landraces were classified into three distinct groups: highly resistant (21), moderately resistant (70) and susceptible (70). The landraces harbour a range of five to nineteen genes representing blast resistance allele with the frequency varied from 4.96% to 100%. The cluster analysis grouped entire 161 landraces into two major groups. Population structure along with other parameters was also analyzed to understand the evolution of blast resistance gene in rice. The population structure analysis and principal coordinate analysis classified the landraces into two sub-populations. Analysis of molecular variance showed maximum (93%) diversity within the population and least (7%) between populations. Five markers viz; K3957, Pikh, Pi2-i, RM212and RM302 were strongly associated with blast disease with the phenotypic variance of 1.4% to 7.6%. These resistant landraces will serve as a valuable genetic resource for future genomic studies, host-pathogen interaction, identification of novel R genes and rice improvement strategies.

Citing Articles

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