Title: Quantitative Trait Locus Mapping for Flowering Time in a Lowland × Upland Switchgrass Pseudo-F Population

Journal Article · · The Plant Genome
 [1];  [2];  [2];  [3];  [4];  [5];  [6]
  1. Univ. of Wisconsin, Madison, WI (United States); DNASTAR, Madison, WI (United States); OSTI
  2. Purdue Univ., West Lafayette, IN (United States)
  3. Michigan State Univ., East Lansing, MI (United States); DuPont Pioneer, Johnston, IA (United States)
  4. Michigan State Univ., East Lansing, MI (United States)
  5. Univ. of Wisconsin, Madison, WI (United States)
  6. USDA-ARS, U.S. Dairy Forage Research Center, Madison, W (United States)
+ Show Author Affiliations

Flowering is an important developmental event in switchgrass (Panicum virgatum), as the time to complete the life cycle affects overall biomass accumulation. The objective of this study was to generate a linkage map using single nucleotide polymorphism (SNP) markers to identify quantitative trait loci (QTL) associated with flowering time. A pseudo-F population was created by crossing two siblings derived from an initial cross between the lowland population Ellsworth and the upland cultivar Summer. Heading and anthesis dates were collected for 2 yr at two locations: DeKalb, IL and Lafayette, IN. Nine QTL for flowering time were detected, two of which were heading-associated, four anthesis-associated, and three associated with both heading and anthesis. One QTL on linkage group (LG) 2a was detected for heading and anthesis in each location and year when environments were analyzed separately, and in a combined analysis across both locations and years. The effect on heading and anthesis of the QTL on LG 2a ranged from 4 to 13 and 5 to 9 d, respectively, depending on environment. Our findings validate QTL for switchgrass flowering time from previous research and identified additional QTL. Based on the switchgrass reference genome version 1.1, flowering time gene homologs reside near the LG 2a QTL and include PSEUDO RESPONSE REGULATOR 5, SUPPRESSOR OF FRIGIDA 4, and APETALA 1, respectively involved in the circadian clock, vernalization, and floral meristem identity. Markers linked to the QTL can be used to improve the efficiency of breeding switchgrass for delayed flowering to increase biomass yield.

Research Organization:
Univ. of Nevada, Reno, NV (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
Grant/Contract Number:
FC02-07ER64494; SC0008834; SC0010631
OSTI ID:
1499379
Journal Information:
The Plant Genome, Journal Name: The Plant Genome Journal Issue: 2 Vol. 11; ISSN 1940-3372
Publisher:
Alliance of Crop, Soil, and Environmental Science SocietiesCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Quantitative Trait Loci for Freezing Tolerance in a Lowland x Upland Switchgrass Population journal March 2019
Marginal Lands to Grow Novel Bio-Based Crops: A Plant Breeding Perspective journal March 2020
Selection for Flowering Time as a Mechanism to Increase Biomass Yield of Upland Switchgrass journal October 2019
Breeding progress and preparedness for mass-scale deployment of perennial lignocellulosic biomass crops switchgrass, miscanthus, willow and poplar journal October 2018
Genome-Wide Association Study in Pseudo-F2 Populations of Switchgrass Identifies Genetic Loci Affecting Heading and Anthesis Dates journal September 2018

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