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The remontant flowering of perennial plants: implications for breeding reblooming bearded iris

Fan, Z. P., Gao, Y. K., Liu, R., Wang, X. Z., Guo, Y. C.
Acta horticulturae 2019 no.1237 pp. 105-110
Hydrangea, Paeonia suffruticosa, Rosa chinensis, cultivars, flowering, flowers, gene editing, genes, hybridization, landscapes, metabolome, molecular biology, parents, perennials, phenotype, plant breeding, proteome, transcriptome, urban areas
Many perennial plants, such as Chinese rose, hydrangea, daylily, tree peony and bearded iris can flower out of season. The extended ornamental stages make them important in urban landscape, thus bringing much more commercial potential and becoming new breeding hotspot. Unlike other remontant plants, although over 2,200 reblooming cultivars have been registered in the American Iris Society until 2012, the breeding of reblooming bearded iris was mainly according to hybridizers' experience and lack of scientific data to instruct the breeding practice. It is imperative to investigate the essence of reblooming, from the perspective of both traditional genetics and molecular biology. During this presentation, a historical perspective on the remontant flowering plants and our recent advances in reblooming bearded iris will be reviewed. For example, the phenotypic performances of rebloomers, some superior parents selected after a large amount of hybridization, some F(1) populations with reblooming characteristics. Also, some prospects of further researches will be presented, such as the comprehensive profiling of transcriptome, proteome and metabolome, or using CRISPR/CAS 9 to knock out the suppressive genes of flowering.