Linkage mapping evidence for a syntenic QTL associated with flowering time in perennial C₄ rhizomatous grasses Miscanthus and switchgrass

Abstract

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Characterization of the Ghd8 Flowering Time Gene in a Mini-Core Collection of Miscanthus sinensis

“…Genomic synteny and collinearity are common features in the Poaceae [38,39], and have also been confirmed among rice, sorghum, switchgrass and M. sinensis genomes [29,31,[40][41][42][43]. Previous studies have identified genes/QTLs under parallel evolution across grass species [31,33,[44][45][46][47][48]. To date, there have been no reports of Ghd8 in C4 bioenergy crops such as sorghum, switchgrass and Miscanthus.…”

“…Ehd1 in rice is induced by blue light in the morning, and Ghd7 suppression of Ehd1 is induced by red light in the morning under LD, thereby suppressing flowering, whereas under SD, the peak of Ghd7 expression shifts to night, and this misaligned timing allows Ehd1 to induce Hd3a and promote flowering [ 12 ]. Genomic synteny and collinearity are common features in the Poaceae [ 38 , 39 ], and have also been confirmed among rice, sorghum, switchgrass and M. sinensis genomes [ 29 , 31 , 40 , 41 , 42 , 43 ]. Previous studies have identified genes/QTLs under parallel evolution across grass species [ 31 , 33 , 44 , 45 , 46 , 47 , 48 ].…”

“…To date, information on the genetics of flowering regulation in Miscanthus is in its infancy [ 4 , 7 , 8 ]. Genetic linkage maps revealed fourteen flowering time quantitative trait loci (QTLs) in Miscanthus [ 29 , 30 , 31 ]. Dong et al [ 29 ] found one Miscanthus flowering QTL on LG02 that corresponded to sorghum maturity gene Ma3 ( PhyB ) [ 26 ] and another located on LG01 that corresponded to the ASYMMETRIC LEAVES-like1 gene, which controls proximal–distal patterning in Arabidopsis petals [ 32 ].…”

“…Gifford et al [ 30 ] found a Miscanthus QTL that corresponded to sorghum maturity gene Ma5 ( PHYTOCHROME C, PhyC) . Jensen et al [ 31 ] reported eleven flowering QTLs on LG04 in M. sinensis, three of which were robust QTLs related to the age-dependent flowering pathway ( SQUAMOSA PROMOTER BINDING PROTEIN-LIKE and MADS-box SEPELLATA2 ) and the gibberellin pathway (gibberellin-responsive bHLH137). However, the functions of these candidate flowering time genes in the Miscanthus QTLs have yet to be verified, and allelic sequence variation for these genes has yet to be described.…”

A chromosome-level assembly of the “Cascade” hop (Humulus lupulus) genome uncovers signatures of molecular evolution and improves time of divergence estimates for the Cannabaceae family

“…For hop, an open question is whether the apparent expansion of LTR content in syntenic blocks has influenced the evolution and regulation of genes involved in traits of interest. Future work will be necessary to identify CREs, ACRs, and assess their role in controlling gene expression (Jensen et al , 2021).…”