Crescimento dos frutos de laranjeira 'Salustiana' situados em ramos anelados com diversas relações de folhas/frutos

Abstract

RESUMO-A relação entre a área foliar e o crescimento dos frutos é um tema que freqüentemente recebe a atenção dos pesquisadores, por influenciar diretamente na produtividade das plantas e na qualidade dos frutos. Neste trabalho, avaliou-se o efeito da área foliar sobre o crescimento dos frutos da laranjeira 'Salustiana'. Foram utilizados ramos com 12 meses de idade e com apenas um fruto terminal. Os ramos foram anelados visando a manter diversas relações de folhas/fruto. Avaliaram-se, semanalmente, o crescimento dos frutos e os teores de amido presentes nas folhas durante um período de 42 dias. O crescimento dos frutos, avaliado na "fase de crescimento II", dependeu da área foliar disponível por fruto, sendo que 30 folhas foram suficientes para garantir o seu crescimento. As reservas de amido nas folhas dependeram da área foliar disponível por fruto e reduziram à medida que os frutos apresentaram aumentos no diâmetro e nas massas fresca e seca. Termos para indexação: relações fonte-dreno, Citrus sinensis (L.) Osbeck, amido GROWTH OF THE FRUITS OF 'SALUSTIANA' SWEET ORANGE LOCATED IN GIRDLED SHOOTS WITH SEVERAL LEAVES TO FRUIT RATIOSABSTRACT-The relationship between the foliar area and the fruit growth is an important theme because affects the tree productivity and fruits quality. In this work was evaluated the effect of the foliar area on the growth of the Salustiana's sweet orange fruits. Girdled shoots of 12 months were used with a single terminal fruit and several leaves-fruit ratios. It was evaluated, weekly, the fruit growth and the leaves starch contents during 42 days. The fruit growth, evaluated in the stage II, depended on the available leaf area per fruit, provided that 30 leaves were enough to guarantee its growth. The starch reserves in the leaves depended on the available leaf area per fruit and they reduced with the increase in the diameter and dry and fresh weight of the fruits.

Determination of organic acids and carbohydrates in ‘Salustiana’ orange fruit from different rootstocks

“…These values were significantly greater than those noticed in oranges from 'Cleopatra' mandarin, which resulted in fruit of small caliper with 163 g per fruit and longitudinal and equatorial diameter of 65 and 68 mm, respectively. These values are greater than those observed by Siqueira et al (2007) and Bini et al (2009) evaluating the same cultivar in Valencia (Spain) and Uruguaiana (Brazil). Siqueira et al (2007) recorded 46 g per fruit with 46 mm of diameter at the end of their experiment; while Bini et al (2009) 128 to 139 g with diameters between 64 and 68 mm, depending on the crop season.…”

“…These values are greater than those observed by Siqueira et al (2007) and Bini et al (2009) evaluating the same cultivar in Valencia (Spain) and Uruguaiana (Brazil). Siqueira et al (2007) recorded 46 g per fruit with 46 mm of diameter at the end of their experiment; while Bini et al (2009) 128 to 139 g with diameters between 64 and 68 mm, depending on the crop season. On the other hand, our findings were related to those found by Santos et al (2010), characterizing eight seedless varieties of citrus produced in Viçosa (Brazil), in which 'Salustiana' orange fruit ranked 160 g with diameters between 68 and 70 mm.…”