Resumen

FLORIDO, Marilyn et al. Plant heat tolerance screening of ex situ preserved tomato (Solanum L. section Lycopersicon subsection Lycopersicon) gemplasm. cultrop [online]. 2009, vol.30, n.4, pp. 00-00. ISSN 1819-4087.

This work was developed with the aim of 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.

Palabras clave : tomatoes; Solanum L; heat stress; heat tolerance.

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