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THERMAL REQUIREMENT AND PHENOLOGICAL CHARACTERIZATION OF PAPAYA VARIETIES CULTIVATED UNDER SUBTROPICAL CLIMATE     MARCELO DE SOUZA SILVA1; SARITA LEONEL2; JACKSON MIRELLYS AZEVEDO SOUZA2; RAFAEL BIBIANO FERREIRA2; JOYCE HELENA MODESTO2 E ANA CAROLINA BATISTA BOLFARINI2   1 Departamento de Producao Vegetal, Faculdade de Agronomia e Engenharia Florestal – FAEF, Rod. Cmte. Joao Ribeiro de Barros, Km 420, 17400-000, Garca - SP, Brasil, mace-lo-souza@hotmail.com. 2 1Departament. de Agronomia/Horticultura, Faculdade de Ciencias Agronomicas da UNESP, Av. Universitaria, no 3780 - Altos do Paraiso, 18610-03, Botucatu – SP, Brasil, sarinel@fca.unesp.br, jackson.mirellys@hotmail.com, aprigio_bibiano@hotmail.com, joyce_helena_modesto@hotmail.com, anacarolinabolfarini@hotmail.com.     1 ABSTRACT   The thermal sum has been widely used to correlate phenological phases of a culture, a technique used to quantify the time required for any phenological phase in any type of environmental conditions, independently of the species. In view of the above, this study aimed to evaluate the thermal requirement and phenological characterization of papaya varieties cultivated under subtropical climate. It was measured the following phenological stages length: from planting to flowering (PF), from flowering to harvest (FH) and from planting to the beginning of harvest (PH), by measuring the time elapsed between each phenological phase. Female and hermaphrodite flowers were considered for measuring the growth curves of fruits by evaluating length (LF) and diameter (DF) of the fruits at 15-day intervals. The thermal requirement was measured by the accumulation of thermal sum in degree-days (DD) during different phenological phases and fruits development period. In current study conditions, it was possible to infer that Sunrise Solo variety and hybrid Tainung no 1 are earlier, with an approximately 10-month interval between planting and the beginning of the harvest; therefore, necessitating accumulation of 1722.2 and 1798.1 degree-days, respectively.   Keywords: Carica papaya L., degree-days, plant performance.     SILVA, M. S.; LEONEL, S.; SOUZA, J. M. A.; FERREIRA, R. B.; MODESTO, J. H.; BOLFARINI, A. C. B. EXIGENCIA TERMICA E CARACTERIZACAO FENOLOGICA DE VARIEDADES DE MAMOEIRO CULTIVADAS SOB CLIMA SUBTROPICAL     2 RESUMO   A soma termica tem sido amplamente utilizada para correlacionar fases fenologicas de uma cultura, uma tecnica utilizada para quantificar o tempo necessario para qualquer fase fenologica em qualquer tipo de condicao ambiental, independentemente da especie. Frente ao exposto, objetivou-se com este estudo avaliar a exigencia termica e caracterizacao fenologica de variedades de mamoeiro cultivadas sob clima subtropical. Foi mensurado a duracao dos seguintes estadios fenologicos: plantio ao florescimento (PF), florescimento a colheita e plantio ao inicio da colheita, atraves da afericao do tempo decorrido entre cada fase fenologica. As curvas de crescimento dos frutos, acompanhadas em flores femininas e hermafroditas, foram determinadas mediante avaliacao do comprimento e diâmetro dos frutos em intervalos de 15 dias. Ja a exigencia termica foi mensurada atraves do acumulo da soma termica em graus-dia, durante as diferentes fases fenologicas e para o periodo de desenvolvimento dos frutos. Nas condicoes do presente estudo foi possivel inferir que a variedade Sunrise Solo e o hibrido Tainung no1 sao mais precoces, com intervalo entre o plantio e o inicio da colheita de aproximadamente 10 meses, necessitando do acumulo de 1722,2 e 1798,1 graus-dia, respectivamente.   Palavras-chave: Carica papaya L., graus-dia, performance de plantas.