Teores de carboidratos em limeiras ácidas 'Tahiti' tratadas com paclobutrazol

Abstract

LEVELS OF CARBOHYDRATES IN ACID LIME TREE 'TAHITI' TREATED WITH PACLOBUTRAZOLABSTRACT -The Placobutrazol (PBZ) can delay the growth and induce the flowering of citrus through the inhibition of biosynthesis of gibberellins. Besides, other features of the plants can be influenced by the application of PBZ, as well as the concentrations and distribution of carbohydrates. The work was carried out aiming to study the possible relationships between concentrations and distribution of carbohydrates in the plant and application of PBZ in acid lime tree 'Tahiti', grafted on lemon tree 'Cravo' and cultivated in pots of five litters. The PBZ was applied in plants conducted in a growth chamber, under controlled temperature (28º C day/ 20º C night), and photoperiod of 16 hours with light, with photosynthetic photons flow of about 170 µmol m -2 s -1 . The application of PBZ caused significant reductions on the levels of carbohydrates in the leaves because they induced the flowering in the acid lime tree 'Tahiti'. The application of paclobutrazol resulted in the accumulation of reserves of carbohydrates in the roots. Terms for index: Citrus latifolia Tanaka, phytoregulators, hydric stress.

Physiological and biochemical characterization of mango tree with paclobutrazol application via irrigation1

“…per linear meter of canopy, with a mean value of 1.31 mg g -1 . These results corroborate those obtained by Cruz et al (2007), who evaluated the carbohydrate contents in 'Tahiti' acid lime trees treated with paclobutrazol and found that they decreased as doses increased. According to Okuda et al (1996), the magnitude of the decrease in reducing sugar contents of leaves depends on the concentration applied, decreasing as the product concentration increases.…”

Carbohydrate levels in the leaves and production consistency of the Ponkan tangerine when thinned out with Ethephon

“…Levels of total leaf carbohydrates at harvest time were greater than at flowering for all concentrations used (Figure 4). This behavior may be attributed to the greater consumption of carbohydrates that occurs at flowering in citrus plants in order to form both vegetative and flowering shoots (CRUZ et al, 2007;MONERRI et al, 2011;RUIZ et al, 2001). After the period of natural abscission, in addition to the lower demand for carbohydrates by the fruits, transport from the roots to (Figures 2A and 3A).…”

“…Levels of starch did not differ between treatments ( Figure 3B). This behavior may be due to the conversion of carbohydrate reserves (starch) to soluble sugars, caused by the demand for fruit development (CRUZ et al, 2007;MONERRI et al, 2011). In the second year (2009/2010), linear increases were observed for leaf soluble carbohydrates and starch Carbohydrate levels in the leaves and production consistency of the Ponkan tangerine when thinned out with Ethephon ) for periods of evaluation, in Perdões, Minas Gerais, Brazil the leaves (MEHOUACHI et al, 2009) and an increase in the rates of photosynthesis during the summer can occur (PEREIRA et al, 2011), which results in the accumulation of starch in the leaves at harvest time.…”

“…It is known that carbohydrates are used in the formation and development of the flowers and fruit of citrus trees (CRUZ et al, 2007;MONERRI et al, 2011;RUIZ et al, 2001) and that the total carbohydrate demand by the flower during anthesis exceeds the daily carbohydrate production of the leaf (BUSTAN; GOLDSCHMIDT, 1998), with higher levels being necessary before flowering in order to allow for fixation of the flowers and fruits and avoid alternate bearing.…”

“…Carbohydrate reserves are used in the formation and development of the flowers and fruit of citrus trees (CRUZ et al, 2007;MONERRI et al, 2011;RUIZ et al, 2001). During this stage, the demand for carbohydrates in the plants is high, due to the excessive amount of flowers formed by the tangerine, surpassing the daily production of carbohydrates by the leaves (BUSTAN; GOLDSCHMIDT, 1998).…”