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Physiology of low-chilling requirement blueberry plants, growth in subtropical climate Functional food have been increasingly present in the human diet due to its beneficial effects on health, and among such foods, stands out blueberries. Recognized as a super fruit, blueberry is characterized by its high concentration of anthocyanins, pigments with antioxidant activity associated with the fight against cancer, osteoporosis, Alzheimer's and ophthalmological diseases, and due to its versatility, it is widely used in world gastronomy. Blueberry production is led by the United States and Canada and with the increasing demand for fruits, the blueberry growth has expanded to countries in the Southern Hemisphere, such as Brazil. As a tipical temperate fruit crop, blueberry plants demands a certain number of chilling hours during the winter to overcome its dormancy period and enter the reproductive period, which may limit the expansion of blueberry production in regions of higher temperatures. As a strategy to expand the growing areas, the University of Florida has developed blueberry cultivars of low-chilling requirement and among them are 'Emerald' and 'Jewel', both growth in the city of Piracicaba, State of Sao Paulo, Brazil. In December 2016, plants of both cultivars were pruned and in 2017 they were evaluated regarding its vegetative and reproductive growth, carbohydrate contents and partition and photosynthetic performance. The less vigorous growth of ‘Emerald’ resulted in more effective carbohydrate storage and partition, wich reflected in a higher yield than ‘Jewel’. In ‘Emerald’, the values for photosynthesis, stomatal condutance, intercellular CO2 concentration, LAI and chlorophyll were higher than in ‘Jewel’, however, the photosynthetic performance of both cultivars was affected by high air temperature and low umidity conditions. The results obtained in this study confirm the importance of cultural practices which provide balanced growth and development to blueberry plants, optimizing the carbohydrates partition and photosynthesis, supporting carbon assimilation specially during fruit production.

Fisiologia de mirtileiros de baixa exigência em frio, cultivados em região subtropical