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ARS Home » Northeast Area » Beltsville, Maryland (BARC) » Beltsville Agricultural Research Center » Genetic Improvement for Fruits & Vegetables Laboratory » Research » Research Project #434363

Research Project: Genetic Improvement of Blueberry and Cranberry Through Breeding and Development/Utilization of Genomic Resources

Location: Genetic Improvement for Fruits & Vegetables Laboratory

Project Number: 8042-21000-279-00-D
Project Type: In-House Appropriated

Start Date: Mar 20, 2018
End Date: Mar 19, 2023

Objective:
Objective 1: Deliver enhanced genomic resources for blueberry and cranberry breeding and genetic research including: improved genome assemblies, germplasm genotypes, mapping populations, saturated genetic linkage maps, mapping data for high value quantitative traits, and candidate gene analysis using genetic and bioinformatic approaches. [NP 301, C1, PS1A, C2, PS2A] Subobjective 1a: Develop improved assemblies of the blueberry and cranberry genomes using long-read sequencing technologies and anchor new genome assemblies to well-saturated genetic linkage maps. Subobjective 1b: Map QTL for cold hardiness, chilling requirement, fruiting season, disease resistances, and fruit quality traits using improved maps and well-characterized bi-parental and association mapping populations. Subobjective 1c: Identify candidate genes for traits by their proximity to QTL, by homology to genes characterized in other systems, and by expression studies on plants with contrasting phenotypes. Objective 2: Develop and release new blueberry germplasm that is enhanced for prolific, indeterminate fruiting and cold tolerance by incorporating germplasm from exotic sources into the program. [NP 301, C1, PS1B] Objective 3: Develop and release new blueberry cultivars that are enhanced for mechanical harvesting, expanded fruiting season, cold hardiness, tolerance of higher pH soils, resistance to mummy berry and fruit rot, and adaptability to changing environmental conditions. [NP 301, C1, PS1B] Objective 4: Identify and characterize key pathogens of blueberry and cranberry and the genes that mediate plant-pathogen interactions, including stem blight (blueberry) and key pathogens in the fruit rot complex (cranberry), as well as plant-environment interactions. [NP 301, C3, PS3A; NP 303, C1, PS1, C2, 2B]

Approach:
The approach entails the integration of genomic approaches with traditional breeding and plant pathology in the development of improved blueberry and cranberry cultivars. Scientists will develop enhanced genomic resources for blueberry and cranberry, including improved genome assemblies, well-saturated genetic linkage maps with anchorage to the genomes, and well-characterized bi-parental and association mapping populations, and identify quantitative trait loci (QTL) for horticulturally significant traits such as cold hardiness, chilling requirement, fruiting season, disease resistances, and fruit quality traits. In addition, scientists will carry out gene expression studies to identify the actual genes underlying significant QTL. Scientists will also identify key genes in blueberry and cranberry that mediate plant-pathogen interactions, including stem blight (blueberry), key pathogens in the fruit rot complex (cranberry), and plant-environment interactions. Scientists will characterize and incorporate new germplasm, and generate new blueberry cultivars that meet industry needs. Better genomic resources for these crops will enable marker development for use in marker-assisted breeding.