Resistance to Infection of Rice Tungro Viruses and Vector Resistance in Wild Species of Rice (Oryza spp.).

Genotyping-by-Sequencing Based Investigation of Population Structure and Genome Wide Association Studies for Seven Agronomically Important Traits in a Set of 346 Oryza rufipogon Accessions

“…Different kinds of populations such as advanced backcross populations, backcross inbred lines, chromosome segment substitution lines, near-isogenic lines, and recombinant inbred lines have been derived from crosses between O. rufipogon and O. sativa as a prebreeding material (Neelam et al 2018). Genes for biotic stress like bacterial blight resistance (Zhang et al 1998;Utami et al 2008), brown planthopper resistance (Deen et al 2017), tungro virus tolerance (Kobayashi et al 1993), and abiotic stress tolerance like acidic conditions, iron toxicity, phosphorus deficiency have been transferred from O. rufipogon into rice cultivars by McCouch et al (2007) and Brar and Khush (2006). Similarly, there have been a number of studies where introgression lines and back-cross populations derived from O. rufipogon accessions have been used to map yield related QTLs.…”

Genotyping-By-Sequencing Based Investigation of Population Structure and Genome Wide Association Studies for Seven Agronomically Important Traits in a Set of 346 Oryza Rufipogon Accessions

“…Different kinds of populations such as advanced backcross populations, backcross inbred lines, chromosome segment substitution lines, near-isogenic lines, and recombinant inbred lines have been derived from crosses between O. ru pogon and O. sativa as a pre-breeding material (Kumari et al 2018). Genes for biotic stress like bacterial blight resistance (Zhang et al 1998;Utami et al 2008), brown planthopper resistance (Deen et al 2017), tungro virus tolerance (Kobayashi et al 1993), and abiotic stress tolerance like acidic conditions, iron toxicity, phosphorus de ciency have been transferred from O. ru pogon into rice cultivars by McCouch et al 2007a andKhush 2006. Similarly, several yield enhancing loci like yld1.1, yld1.2, yld2.1, yldp2.1, yldp2.2, yldp9.1 and yield-enhancing traits such as spikelet number, grain number, grain size, grain weight, and panicle length have been identi ed and mapped in populations developed from crosses of O. sativa × O. ru pogon. The results from various studies focused on enhancing yield support transgressive segregation for yield and related components, making O. ru pogon ideal germplasm for mining yield enhancing loci (McCouch et al 2007b).Majority of the research on O. ru pogon has utilized only a few accessions in different biparental crosses, thus limiting the allelic diversity and genetic resolution.…”

Development of chromosome segment substitution lines (CSSLs) of Oryza longistaminata A. Chev. & Röhr in the background of the elite japonica rice cultivar, Taichung 65 and their evaluation for yield traits

“…In spite of its overall inferior appearance, O. longistaminata has been reported to have drought avoidance mechanisms, good weed suppression ability via allelopathy (Zhang et al 2008), and high nitrogen-use efficiency (Yang et al 2010). It also has known resistance to brown planthopper (BPH), nematodes, yellow stem borer, rice tungro bacilliform virus, blast, and bacterial blight (BB) (Kobayashi et al 1993(Kobayashi et al , 1994Soriano et al 1999;Khush 2002, 2003;Chen et al 2009). Since the identification of Xa21, the BB resistance gene from O. longistaminata (Ronald et al 1992), commercial hybrids carrying Xa21 have been successfully developed and released in the Philippines, India, China, and Thailand (Brar and Khush 2006;Sanchez et al 2013).…”