Dissecting Vegetative Period Into Its Phenotypic and Genotypic Components Allows Environment-Specific Breeding in
Salvador Osuna-Caballero1, Taryn Heidecker1, James L Weller2
1Department of Plant Sciences, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
Physiologia Plantarum
|December 29, 2025
Summary
Understanding lentil flowering time is crucial for high-latitude adaptation. This study identified key genetic regions controlling emergence and flowering, offering insights for breeding improved cultivars.
Area of Science:
- Plant genetics
- Crop science
- Agricultural research
Background:
- Flowering time in legumes is influenced by temperature and photoperiod, posing challenges for high-latitude lentil production.
- Prolonged vegetative periods are advantageous in high-latitude regions with short growing seasons and extended daylight.
- Adapting lentil cultivars to specific agroclimatic conditions is essential for optimizing yield and crop success.
Purpose of the Study:
- To investigate phenology-related traits in a lentil recombinant inbred line population under long-day conditions.
- To identify quantitative trait loci (QTLs) associated with days to emergence (DTE), days to flowering (DTF), and days to pod maturity (DTM).
- To dissect the genetic control of the vegetative period into distinct emergence and flowering phases.
Main Methods:
- Utilized a recombinant inbred line (RIL) population derived from a cross between CDC-Milestone and ILL8006.
- Constructed a high-density genetic linkage map using molecular markers and the Lcu.2RBY reference genome.
- Performed QTL analysis across four site-years and differential expression analysis of flowering time genes.
Main Results:
- Identified three major QTLs for DTE on chromosome 2, explaining 16%-28% of phenotypic variability.
- Located a significant QTL for DTF on chromosome 6 (qDTF6.I), accounting for 23%-56% of phenotypic variability, containing a FLOWERING LOCUS T homolog.
- Discovered distinct genetic controls for DTE and DTF, indicating separate regulatory pathways.
Conclusions:
- Genetic dissection of the vegetative period into DTE and DTF provides a refined approach for breeding.
- Identified specific QTLs and candidate genes that can be targeted for lentil adaptation to diverse environments.
- Breeding strategies can leverage distinct genetic controls of emergence and flowering to enhance lentil adaptation and yield.
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