Dynamics of fertility-related traits in tomato landraces under mild and severe heat stress
Author(s)
Date Issued
2022
Type
article
Volume
11
Issue
7
Journal or Series
Abstract
Studies on the reproductive dynamics under heat stress are crucial to breed more tolerant
cultivars. In tomato, cultivars, breeding lines, and wild species have been evaluated for their response
to heat stress. Here, we addressed the study to a panel of selected landraces representing traditional
genotypes that usually show high adaptation to local environments. In two experiments, spaced by
12 years, we set-up an identical experimental design with plants transplanted at two different dates to
expose the second field to thermic stress with natural fluctuations. Such a strategy resulted in both a
mild and severe stress in the two years. The landraces showed wide variation for both vegetative and
reproductive traits; all traits were affected by heat, mostly with a significant Genotype*Environment
interaction. A high broad-sense heritability was estimated for plant height, stigma position, pollen
viability, and fruit weight. Low heritability estimates were found for the number of flowers, fruit set,
and yield. Despite the interaction, traits recorded under control and heat conditions were positively
correlated. Multivariate analysis located the genotypes in a topography that was stable under all
conditions, except under the harshest temperatures. The study revealed that landraces present a
wide variability for the response of reproductive traits to thermic challenges and that such a variation
could be useful to dissect the traits with higher heritability and identify quantitative trait loci for
breeding more resilient varieties.
Subjects
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