Produção da limeira ácida Tahiti submetida ao anelamento e à incisão anelar de ramos

• Ano de defesa: 2012
• Autor(a) principal: Santos, Dierlei dos
• Orientador(a): Siqueira, Dalmo Lopes de
• Banca de defesa: Decarlos Neto, Antônio , Oliveira, Juraci Alves de
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Doutorado em Fitotecnia
• Departamento: Plantas daninhas, Alelopatia, Herbicidas e Resíduos; Fisiologia de culturas; Manejo pós-colheita de
• País: BR
• Palavras-chave em Português: Citrus latifolia Tan; Carboidratos; Fluorescência da clorofila; Florescimento
• Palavras-chave em Inglês: Citrus latifolia Tan; Carbohydrates; Chlorophyll fluorescence; Flowering
• Área do conhecimento CNPq: CNPQ::CIENCIAS AGRARIAS::AGRONOMIA::FITOTECNIA::FISIOLOGIA DE PLANTAS CULTIVADAS
• Link de acesso: http://locus.ufv.br/handle/123456789/1179

The girdling and ringing branches are practices that can be used to increase the production and retention of citrus fruits. Both disrupt transport by the phloem, favoring the carbohydrates accumulation in the leaves and branches, which can be reversed for setting and fruit development. Despite the benefits, in some cases the girdling can induce excessive accumulation of carbohydrates, which may compromise the photosynthetic machinery. This work aimed to study the carbohydrates dynamics, the chlorophyll fluorescence a and Spad index, in leaves of acid lime trees Tahiti . The aimed also to study the differences between the use of girdling and ringing done at different flowering times, the floral structures fall and fruit set of acid lime trees Tahiti in two consecutive harvests. Were studied in two consecutive harvests, four times the performance of girdling and ringing, 06/30, 07/15, 07/30 and 08/14 in 2009 and 06/15, 07/05, 07/25 and 08/14 in 2010, and additional treatment, the control. The girdling, regardless of achievement time, increased starch and soluble sugars levels in Tahiti leaves until around 50 to 60 days after implementation. The ringing, regardless of achievement time, not changes the plants starch contents in 2009 harvests, which behaved to control similarly. Regarding the 2010 harvest, was observed that ringing, regardless of achievement time, increased starch content to the control compared, but increase was less than to that which occurred in girdled plants. There was no variation of F0 and Fv/Fm ratio in girdled plants 2009 harvest. The girdling in 2010 promoted F0 increases and Fv/Fm ratio reduced at around 60 days. For control and ringing plants, there was F0 increase and Fv/Fm ratio reduced in 2009, around 120 days. In 2010, an F0 increase is the maximum value 50 days attained, but lower than those observed for girdling, and there was no change in Fv/Fm ratio. In the 2009 harvest, plants to girdling subjected, regardless of achievement time, showed Spad index reduced, reaching minimum values (48-53) at around 80-90 days. In the 2010 harvest, the minimum values (64-66) were reached at about 100-110 days. The girdling and ringing branches, regardless of harvest and application time, did not alter flowering times and fruit. It also did not alter the fall rate of the floral structures. The fruit set percentage (PPF), the number of produced fruits (NFP) and per plant yield (PPP) for girdled plants were higher the control compared, while the average mass fruit (MMF) and average diameter fruit (DMF) were lower. Plants to ringing subjected showed no differences to control compared for such characteristics in the two evaluated harvests. Regardless realization time, the two features that 2009 were changed, was the buds number below the phloem interruption, and the PPF, the first feature 56.25, and second, 3.19 times higher in girdled plants. It was also observed that girdling caused less abscission of floral structure in the flowers form (FA) (43% reduction). This reduction favored the highest PPF (117% increase), NFP (117% increase) and PPP (84% increase) compared to ringing plants. However, with retention increasing on the plant fruit, 12% decreased in the MMF. The values measurements of fruit growth, both in 2009 when 2010 harvest, adjusted to a sigmoidal curve, and were not affected by treatments.