ASSESSMENT LEVEL heat tolerance PLANT IN TOMATO GERMPLASM (Solanum L. section Lycopersicon subsection Lycopersicon) Conserved ex situ
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Abstract
evaluating heat tolerance in a representative sample of ex situ
preserved tomato (Solanum L. section Lycopersicon
subsection Lycopersicon) germplasm in Cuban collections and
identifying the most tolerant accessions to be used in plant
breeding programs. Thus, fruit set percentage was evaluated
over the optimal and heat-stressing (spring-summer) crop
periods for calculating the following stress criteria: stress
susceptibility index (ISE); stress tolerance value (TOL), stress
tolerance index (ITE), stress geometric fruit set (FGE) and
relative tolerance index (IT). Thus, 122 accessions were
classified for their plant heat tolerance based on fruit set
percentage in spring-summer sowings, besides the relationship
among tolerance indexes was performed through Biplot
analysis. Regarding the germplasm evaluated, there were
accessions with high fruit set percentages within the spring-
summer period, indicating that the ex situ preserved germplasm
in Cuba has heat tolerant accessions, which can be used in
plant breeding programs to obtain good-performing varieties
and hybrids under these conditions.
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