Identification of interspecific heterotic loci associated with agronomic traits in rice introgression lines carrying genomic fragments of Oryza glaberrima

Introgression of Heterotic Genomic Segments from Brassica carinata into Brassica juncea for Enhancing Productivity

“…SNP markers (polymorphic between B. carinata accession BC-4 and respective genetic backgrounds) were used to identify 254 and 335 heterotic genomic segments (Tables S4 and S5) from D31_ILs and PM30_ILs, respectively, and representative markers from heterotic segments were used to identify candidate genes. This approach to the dissection of heterotic segments was in close accordance with the studies conducted by Gaikwad et al [9] and Nassirou et al [32]. Introgressed segments from the donor parent (BC-4) could explain the high heterosis in yield and yield-related traits in this study.…”

“…The population required for the identification of heterotic loci and heterotic effects should be derived from elite hybrids with a strong heterozygous advantage over parents [28]. Heterotic loci and heterotic effects can be identified by the F 2 [29], immortalized F 2 and DH [30], RILBC 1 [31], and the CSSLs/ILs [32][33][34][35][36] populations. Due to the low background noise caused by the presence of only a few introgressed segments, ILs are valuable resources for identifying heterotic loci, heterotic effects, and desirable allelic interactions [37,38].…”

Exploiting interspecific heterosis between African rice and Asian rice

“…The NERICA rice varieties were successfully developed from the interspecific crosses between the two species by using in vitro embryo rescue techniques at WARDA (Bimpong et al., 2010). The ILs derived from the interspecific crosses between the two species were also developed and used in research of mining new beneficial genes and breeding new types of elite inbred and hybrid rice varieties (Chen et al., 2016; Huang et al., 2013; Nassirou et al., 2017). Introgression lines incorporated with high proportions of African rice genomic fragments and their test crosses with Asian rice varieties usually showed low pollen and spikelet fertility, which limited the potential of the interspecific heterosis (Adedze et al., 2016; Chen et al., 2016; Xu et al., 2005).…”

“…Introgression lines (ILs) (Juan et al., 2015; Tian et al., 2006) and CSSLs (Liu et al., 2009; Zeng, Akshay, Liu, & Zhang, 2006) were developed, such as introducing chromosomal segments of different wild rice species into the Asian rice genome (Deng et al., 2012; Guo et al., 2013; Yuan et al., 2009). The introduction of African rice genomic fragments into the Asian rice to develop introgression restorer lines (IRLs) was also an effective way to broaden the genetic diversity and develop high‐yielding partial interspecific hybrid (PIH) rice incorporated with both intraspecific and interspecific heterotic loci (Adedze et al., 2016; Chen et al., 2016; Nassirou et al., 2017).…”