Teores de carboidratos em órgãos lenhosos do caquizeiro em clima tropical

Abstract

RESUMO-Nas fruteiras caducifólias, o metabolismo de carboidratos constitui-se no principal mecanismo que garante a sua sobrevivência no período de dormência, estando, também, relacionado ao seu potencial produtivo em safras subseqüentes. Conhecer a forma como a planta utiliza esses carboidratos durante o seu desenvolvimento é um passo importante para o entendimento das suas relações fonte-dreno e para fundamentar algumas práticas de manejo, como a poda e o raleio de frutos. Caracterizar a variação dos teores de amido e de carboidratos solúveis totais em órgãos lenhosos do caquizeiro (Diospyros kaki L.), no decorrer do seu desenvolvimento fenológico, foi o objeto de investigação do presente estudo. O trabalho foi conduzido em um pomar de caquizeiros localizado na área experimental da Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ), em Piracicaba, Estado de São Paulo, durante o ciclo 2002/ 2003. A fenologia das plantas foi caracterizada pelo período de ocorrência e duração do alongamento dos ramos, florescimento, desenvolvimento dos frutos e das folhas e do abortamento natural de frutos. A variação dos teores desses carboidratos em ramos e em raízes foi analisada tendo por base os diferentes estádios fenológicos. Ocorreram variações significativas no teor desses carboidratos no período de estudo. A mobilização do amido nos ramos teve grande importância na sustentação de um novo ciclo de brotações. O maior consumo de amido ocorreu durante a abscisão foliar, e a reposição no seu estoque, nos ramos e nas raízes ocorreu, principalmente, entre o florescimento e a abscisão foliar. Termos para indexação: fenologia, desenvolvimento, amido. CARBOHYDRATE CONTENT IN PERSIMMON TREE WOODY ORGANS IN TROPICAL CLIMATEABSTRACT-In deciduous fruit trees, the carbohydrate's metabolism are recognized as the main mechanism that ensures their survival during the rest period. Besides it, the very same metabolism is related to the productive potential in subsequent harvest seasons. Knowing how the plants use those carbohydrates during their development and growth is an important step in the right direction to understand the relation source-drain more effectively along with building up the fundamentals of some handling practices, for instance, the pruning and fruit thinning. The objective of the present study was to characterize how the total soluble sugars content and the starch vary in woody organs of the persimmon tree (Diospyros kaki L) in elapsing of its phenological development. This study was carried out in the experimental area of the Escola Superior de Agricultura "Luiz de Queiroz" (ESALQ) in Piracicaba -SP, during the cycle 2002/2003. The phenology of persimmon tree was described by the occurrence period and prolongation of shoot growth, flowering, fruit growth, leaf expansion and natural abortion of fruits. The carbohydrates content in stems and roots were analyzed based on different phenological stages. The results showed a significant variation in the starch and total soluble sugars content in the sampled organs. The ...

Cold storage of budsticks/clefts for staggered grafting in persimmon trees

“…However, starch content increased later after 72 days, possibly due to preventing the sprouting of buds of the stored branches, to detriment of the low temperature of the cold conservation storage ( Figure 2B). CORSATO et al (2008) also observed an equation identical to that of the present paper for starch contents in persimmon tree branches over time.…”

“…In figure 2A, it is reported that there was a linear increase in the total soluble sugar contents insofar as the branches remained stored over time. CORSATO et al (2008) reported increased total soluble sugar contents in persimmon tree branches beginning at the end of the dormancy period. Since the persimmon tree branches used in this study were collected precisely during the dormancy period, a rise in the total soluble sugar contents was expected.…”

Carbohydrates, Growth and Production of “Roxo de Valinhos” Fig Tree in Initial Development under Irrigation Management

“…Larcher [7] also reports that the intensity of mobilization of carbohydrates influences the branch growth, flowering and fruit production. The results of this study are in agreement with those found by Corsato [29], which evaluated the carbohydrates variation in the root and branch persimmon variety Rama Fort, observed higher total soluble carbohydrates in roots and branches in the months of September and October (spring) due to the air temperature increase.…”

Effect of carbohydrate content on shoot maturation and yield of Palmer mango submitted to potassium fertilization and biostimulant

“…The same behavior was observed for time 2, when there was an increase of 134.85% in the maximum fertilizer dose in relation to the absence of the product. Similar results were found by Corsato et al (2008), in 'Rama Forte' persimmon plants, which also showed increase in sugar content in the period before flowering.…”