Exploring of bacterial blight resistance in landraces and mining of resistant gene(s) using molecular markers and pathogenicity approach

Pyramiding of bacterial blight resistance genes into promising restorer BRRI31R line through marker-assisted backcross breeding and evaluation of agro-morphological and physiochemical characteristics of developed resistant restorer lines

“…It was noted that BRRI31R had the Xa4 gene by default and for this reason, finally, five homozygous pyramided restore lines were selected with four BB resistance genes, Xa4 + xa5 + xa13 + Xa21 from the cross combination, BRRI31R × IRBB60 in BC 3 F 5 progenies. Though Xa4 is not effective against the BB pathogen of Bangladesh but combination of this gene might enhance the function of other resistance gene and combination of these four genes were also found as very effective against the diverse isolates of BB pathogens [ 23 , 25 , 33 , 61 , 64 ]. These gene combinations also gives long-lasting and broad-spectrum resistance in the R8012 restorer line for Chinese CMS Zhong-9A restoration [ 65 ].…”

“…Among them, Xa4 , xa5 , Xa7 , xa13 , Xa21 , and Xa23 genes have been extensively deployed and incorporated into rice cultivars for the development of BB resistant cultivars [ 32 ]. Resistance genes i.e., xa5 , xa13 and Xa21 were found effective for the bacterial blight pathogens of Bangladesh [ 23 , 25 , 33 , 34 ]. Moreover, molecular markers of these resistance genes are widely used in breeding programs to develop bacterial blight resistant rice varieties [ 9 , 35 , 36 ].…”

Evaluation of hybrid rice parental lines against bacterial blight disease and detection of resistant gene (s) by gene‐specific, linked markers

“…Several authors reported that different BB-resistance gene combinations are effective and durable against BB isolates (Arunakumari et al, 2016;Hsu et al, 2020;Jamaloddin et al, 2020). tive combination against all isolates of BB in India (Das & Rao, 2015;Dokku et al, 2013) and Bangladesh (Anik et al, 2022), respectively.…”

“…Several authors reported that different BB‐resistance gene combinations are effective and durable against BB isolates (Arunakumari et al, 2016; Hsu et al, 2020; Jamaloddin et al, 2020). For instance, four gene combinations ( Xa4 + xa5 + xa13 + Xa21 ) and ( Xa4 + Xa7 + xa13 + Xa21 ) have been found to be the most effective combination against all isolates of BB in India (Das & Rao, 2015; Dokku et al, 2013) and Bangladesh (Anik et al, 2022), respectively. Different resistance genes may have different modes and sites of action in the cell; therefore, a combination of these resistance genes makes a complex resistant system, which is difficult to overcome by a pathogen (Stam & McDonald, 2018).…”

“…More than 46 bacterial blight resistance genes have been identified in the world (Chen et al, 2020), and amongst them, xa5 , Xa7 , xa13 , Xa21 and Xa23 have been widely used for developing bacterial blight‐resistant varieties (Dossa et al, 2015; Khan et al, 2014; Singh et al, 2001). xa13 and Xa21 were found to be the most effective genes against the bacterial blight isolates present in Bangladesh (Alam et al, 2016; Islam et al, 2016; Anik et al, 2022). Along with phenotypic screening, molecular marker technology opens up a new era for the identification of multiple resistance genes and alleles in rice genotypes for biotic and abiotic stress (Jena & Mackill, 2008; Xia et al, 2012).…”