Chilling and forcing requirement of five international fig cultivars grown in Southeastern Brazil
AUTOR(ES)
Monteiro, Laís Naiara Honorato; Leonel, Sarita; Souza, Jackson Mirellys Azevedo; Ferreira, Rafael Bibiano; Silva, Marcelo de Souza; Garcia, Emerson Loli
FONTE
Revista Ceres
DATA DE PUBLICAÇÃO
2022
RESUMO
ABSTRACT Chill hours availability influence break dormancy, sprouting and production of temperate fruits trees in different regions. However, there are few reports on the subject for fig tree. This study aimed to evaluate the effects of the accumulated chilling hours on the physiology and dormancy release of fig cultivars. Stem cuttings of five fig cultivars were collected at the end of winter over two crop cycles and exposed to 0, 40, 80, 120 and 160 accumulated chilling hours (CH) in a cold chamber (8±0.5 ºC). Physiology of fig buds was then evaluated with regards to antioxidant enzymes activity, carbohydrate and nitrogen contents. The exposure of fig stem cuttings with two buds to different accumulated CH presented physiological changes for antioxidant enzymes activity, carbohydrates and nitrogen contents and confirming that the cultivars responded differently to the climatic conditions of each crop cycle. Results detected that the lowest accumulated CH in field in 2018 (2.7 CH) enabled a greater effect of the artificial CH when compared to 2017 (19.5 CH). Each fig cultivar had a critical accumulation point. The cultivars Roxo de Valinhos and Pingo de Mel require less CH to break dormancy, while Troyano requires more CH to finish this vegetative rest period.
Documentos Relacionados
- Chilling requirement of four peach cultivars estimated by changes in flower bud weights
- Chemical composition of five loquat cultivars planted in Brazil.
- Floral visitors and reproductive strategies in five melittophilous species of Bignoniaceae in Southeastern Brazil
- Nitrate reductase activity in field-grown pueraria lobata (Kudzu) in southeastern Brazil.
- Chemical composition, antischistosomal and cytotoxic effects of the essential oil of Lavandula angustifolia grown in Southeastern Brazil