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The objective of the present work was to evaluate the productive response of heat tolerant lines of determinate growth tomato under the organic production system. The experiment was carried out in the Instituto de Ciências Agrárias of UFMG, Montes Claros, Minas Gerais state, Brazil. The experimental design was of randomized complete blocks with eight treatments and four replications. The treatments consisted of eight heat tolerant processing type tomato lines obtained from the Asian Vegetable Research and Development Center (AVRDC), China: CLN1621L, CLN1621F, CLN1621E, CLN1466P, CLN2026E, CLN2026D, CLN2026C and CLN2001C. There was an inverse relationship between the average weight of the fruits and the number of fruits per plant. The highest average fruit weight of some lines was compensated by the lowest quantity of fruits, in such a way that there were no significant differences among the lines. Symptoms of nutritional deficiency and incidences of pests and diseases were not verified in any of the studied lines. All lines presented potential for genetic improvement research and cultivation using organic production systems under higher temperature conditions. O objetivo do presente trabalho foi avaliar o desempenho produtivo de linhagens de tomate rasteiro tolerantes ao calor sob o sistema orgânico de produção. O experimento foi realizado no Núcleo de Ciências Agrárias da UFMG, Montes Claros-MG. Foi utilizado o delineamento em blocos casualizados com oito tratamentos e quatro repetições. Os tratamentos consistiram de oito linhagens de tomate do tipo rasteiro tolerantes ao calor obtidos na Asian Vegetable Research and Development Center (AVRDC), China: CLN1621L, CLN1621F, CLN1621E, CLN1466P, CLN2026E, CLN2026D, CLN2026C e CLN2001C. Houve uma relação inversa entre o peso médio dos frutos e o número de frutos produzidos por planta. O maior peso médio de frutos de algumas linhagens foi compensado pelo menor número de frutos, de tal forma que não houve diferenças significativas entre as linhagens. Não foram constatados sintomas de deficiência nutricional e incidências de pragas e doenças nas linhagens estudadas. Todas as linhagens apresentam potencial para pesquisas de melhoramento genético e cultivo em sistemas orgânicos de produção em condições de temperatura mais elevada

Productivity of determinate growth tomato lines tolerant to heat under the organic system