The Use of Rosa Wichurana in the Development of Landscape Roses Adapted to Hot Humid Climates

A genomic link in China roses: and they all lived prickly but water deficient ever after?

“…In the BC1F1 population created by back-crossing a prickleless F1 individual to the prickly OB, plants show a normal distribution of prickle density with 10 plants featuring no prickle, while the other individuals have prickles at different densities on stem ( Figure 3B and 3C; Supplementary Figure S19). These data indicate that, agreeing with previous studies (Bourke et al, 2018;Byrne et al, 2007;Crespel et al, 2002;Hibrand Saint-Oyant et al, 2018;Koning-Boucoiran et al, 2012;Linde et al, 2006;Shupert et al, 2007), stem prickle density is likely a quantitative trait that is regulated by three to four loci with loss of prickle initiation as homozygous recessive in the BTxOB populations.…”

“…A further examination of the relative water contents in prickles and barks for a collection of 39 rose lines (12 wild genotypes, 6 China roses, and 21 modern rose genotypes) revealed a similar pattern ( Figure 4G; Supplementary Figure S37). Taken these together, our results suggested that the prickle patterning might hitchhike the selection on genes involved in water adaptation in roses (Byrne et al, 2007).…”

“…BT and OB are two genotypes featuring at least six-pair of contrasting traits like absence/presence of prickles on shoots (Byrne et al, 2007;Li et al, 2015). To understand the genetic variation associated with these phenotypical traits, we identified 95 synteny blocks covering 87.59% of BT (464.31 Mb) or 80.59% of haploOB (415.5 Mb) genomes and detected 20 inversion events (covering 1,464 of BT or 1,718 of haploOB genes) ( Figure 2A; Supplementary Table S20 Supplementary Table S22).…”

“…Most of rose genotypes harbor prickles, while BT, one of the founder species during rose domestication, does not ( Figure 1A) (Bendahmane et al, 2013;Byrne et al, 2007;Gu et al, 2006). BT grows in a relatively moisture environment and has at least six pairs of contrasting traits like once flowering behavior, prickleless on stem, prostrate growth during vegetative growth season, white-colored single flowers, high resistance to black spots in comparison to OB genotype (Byrne et al, 2007;Li et al, 2015).…”

“…Most of rose genotypes harbor prickles, while BT, one of the founder species during rose domestication, does not ( Figure 1A) (Bendahmane et al, 2013;Byrne et al, 2007;Gu et al, 2006). BT grows in a relatively moisture environment and has at least six pairs of contrasting traits like once flowering behavior, prickleless on stem, prostrate growth during vegetative growth season, white-colored single flowers, high resistance to black spots in comparison to OB genotype (Byrne et al, 2007;Li et al, 2015). These have allowed this species frequently used as parental materials for constructing a set of genetic populations aiming at dissecting the genetic bases of these important traits (Crespel et al, 2002;Hibrand Saint-Oyant et al, 2018;Li et al, 2019c;Li et al, 2015;Shupert et al, 2007;Spiller et al, 2011).…”