New QTLs involved in the control of stigma position in tomato
Author(s)
Date Issued
April 3, 2025
Type
article
Volume
25
Issue
25
ISSN
1471-2229
Journal
Abstract
Background Tomato mating systems were strongly affected by domestication events. Mutations disrupting selfincompatibility
paralleled by changes retracting the stigma position (SP) within the staminal cone conferred strict
autogamy and self-fertility to the cultivated forms. Although major genes affecting these changes have been
identified, SP control in domesticated forms that retain a constitutive or heat-inducible noninserted SP needs
elucidation. To widen the possibility of identifying SP genetic determinants, we analyzed the trait in four populations
(two germplasm collections, a multiparental recombinant inbred and a biparental progeny) under different
environmental conditions (normal and heat stressed).
Results Overall, 37 markers significantly associated with the trait were identified. Several colocalizations were found,
both among regions first reported in this work and among them and previously reported positions. This finding
supported the reliability of the analysis. Three such regions, in the long arms of chromosomes 1, 8 and 11, were
validated in an independent segregating population, and candidate genes in confidence intervals were identified
among transcription factors and hormone-, stress- and cell wall-related genes.
Conclusion Overall, this work supported the hypothesis that the SP phenotype is controlled by different key genes
in tomato, paving the way for the identification of novel players and novel mechanisms involved in the regulation of
herkogamy.
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