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Developmental QTLs in a red raspberry primocane x biennial raspberry population that exhibit primocane fruiting.

Julie Graham*, Kay Smith, Katrin MacKenzie, Linda Milne, Nikki Jennings, Brezo Mateos, Christine Hackett

The changing climate is altering timings of key fruit developmental and ripening processes and increasing the occurrence of fruit defects. This work aimed to expand the knowledge generated previously on the genetic control of the ripening process using a biennial x biennial raspberry F1 population (Latham (L) x Glen Moy (GM) (LxGM)), in this case by examining development in a biennial x primocane F1 population (Glen Fyne (GF) x Autumn Treasure (AT) (GFxAT)). The aim was to identify Quantitative trait loci (QTL) and genome locations associated with the process of development from flower bud swell to ripe fruit, to understand how developmental control in this population differs from that in the LxGM population previously studied. The progeny from this biennial x primocane population all exhibited primocane fruiting completing their lifecycle in a single season. QTL associated with development from bud break to ripe fruit were identified. These QTL differed from developmental QTL for similar developmental stages previously identified on fruiting canes (second year canes) in the LxGM population suggesting control of development differs in different populations. Some insight into gene content in QTL regions is presented.