title: Development and evaluation of near-isogenic lines for major blast resistance gene(s) in Basmati rice.
abstract: A set of NILs carrying major blast resistance genes in a Basmati rice variety has been developed. Also, the efficacy of pyramids over monogenic NILs against rice blast pathogen Magnaporthe oryzae has been demonstrated. Productivity and quality of Basmati rice is severely affected by rice blast disease. Major genes and QTLs conferring resistance to blast have been reported only in non-Basmati rice germplasm. Here, we report incorporation of seven blast resistance genes from the donor lines DHMASQ164-2a (Pi54, Pi1, Pita), IRBLz5-CA (Pi2), IRBLb-B (Pib), IRBL5-M (Pi5) and IRBL9-W (Pi9) into the genetic background of an elite Basmati rice variety Pusa Basmati 1 (PB1). A total of 36 near-isogenic lines (NILs) comprising of 14 monogenic, 16 two-gene pyramids and six three-gene pyramids were developed through marker-assisted backcross breeding (MABB). Foreground, recombinant and background selection was used to identify the plants with target gene(s), minimize the linkage drag and increase the recurrent parent genome (RPG) recovery (93.5-98.6 %), respectively, in the NILs. Comparative analysis performed using 50,051 SNPs and 500 SSR markers revealed that the SNPs provided better insight into the RPG recovery. Most of the monogenic NILs showed comparable performance in yield and quality, concomitantly, Pusa1637-18-7-6-20 (Pi9), was significantly superior in yield and stable across four different environments as compared to recurrent parent (RP) PB1. Further, among the pyramids, Pusa1930-12-6 (Pi2+Pi5) showed significantly higher yield and Pusa1633-7-8-53-6-8 (Pi54+Pi1+Pita) was superior in cooking quality as compared to RP PB1. The NILs carrying gene Pi9 were found to be the most effective against the concoction of virulent races predominant in the hotspot locations for blast disease. Conversely, when analyzed under artificial inoculation, three-gene pyramids expressed enhanced resistance as compared to the two-gene and monogenic NILs.
authors: Division of Genetics, Indian Agricultural Research Institute, New Delhi, 110012, India.
authors: Apurva
authors: A
authors: Khanna
authors: Vinay
authors: V
authors: Sharma
authors: Ranjith K
authors: RK
authors: Ellur
authors: Asif B
authors: AB
authors: Shikari
authors: S
authors: S
authors: Gopala Krishnan
authors: U D
authors: UD
authors: Singh
authors: G
authors: G
authors: Prakash
authors: T R
authors: TR
authors: Sharma
authors: Rajeev
authors: R
authors: Rathour
authors: Mukund
authors: M
authors: Variar
authors: S K
authors: SK
authors: Prashanthi
authors: M
authors: M
authors: Nagarajan
authors: K K
authors: KK
authors: Vinod
authors: Prolay K
authors: PK
authors: Bhowmick
authors: N K
authors: NK
authors: Singh
authors: K V
authors: KV
authors: Prabhu
authors: B D
authors: BD
authors: Singh
authors: Ashok K
authors: AK
authors: Singh
mesh_terms: D000383:Agriculture; D001947:Breeding; D003296:Cooking; D018744:DNA, Plant / Q000235:genetics; D060467:Disease Resistance / Q000235:genetics*; D063427:Food Quality; D017343:Genes, Plant; D008040:Genetic Linkage; D005819:Genetic Markers; D005838:Genotype; D020082:Magnaporthe / Q000472:pathogenicity*; D018895:Microsatellite Repeats; D012275:Oryza / Q000145:classification / Q000235:genetics* / Q000382:microbiology; D010935:Plant Diseases / Q000235:genetics* / Q000382:microbiology; D020641:Polymorphism, Single Nucleotide
chemical_list: D018744:DNA, Plant; D005819:Genetic Markers