TY - JOUR

T1 - Variação da fotossíntese e dos teores de carboidratos induzidos por etefom e déficit hídrico na fase de maturação da cana-de-açúcar Guilherme

AU - Roberto, Guilherme Garcia

AU - Cunha, Camila

AU - Sales, Cristina R. G.

AU - Silveira, Neidiquele Maria

AU - Ribeiro, Rafael Vasconcelos

AU - Machado, Eduardo Caruso

AU - Lagoa, Ana Maria Magalhaes Andrade

PY - 2015

Y1 - 2015

N2 - An important index for the ethanol industry is the sucrose yield in sugarcane, which is affected by plant ability to accumulate sucrose during ripening. Despite the known efficiency of treatments such as water restriction and the application of regulators to stimulate the sucrose storage in culms, little is known about the physiological responses of the plant that lead to ripening. In this context, the aim of this study was to evaluate the physiological responses of sugarcane to different ripening treatments. Two varieties, IACSP95-5000, with high yield, and IACSP94-2094, with moderate yield were subjected to water deficit or application of chemical regulator (ethephon 480 g ha–1) and both treatments associated. Growth, accumulation of carbohydrates in leaves and culms were measured. It can be concluded that the effects of ethephon on sugarcane are genotype-dependent. Ethephon stimulates sucrose accumulation in the culm and the photosynthate supply by the source in the responsive variety (IACSP95-5000). Such effects are not associated with growth restriction. In relation to the drought combined with the application of ethephon, the responsive variety shows increased sucrose content in culm at the same level as when ethephon is applied alone, hence treatments have no additive effects on sugarcane ripening.

AB - An important index for the ethanol industry is the sucrose yield in sugarcane, which is affected by plant ability to accumulate sucrose during ripening. Despite the known efficiency of treatments such as water restriction and the application of regulators to stimulate the sucrose storage in culms, little is known about the physiological responses of the plant that lead to ripening. In this context, the aim of this study was to evaluate the physiological responses of sugarcane to different ripening treatments. Two varieties, IACSP95-5000, with high yield, and IACSP94-2094, with moderate yield were subjected to water deficit or application of chemical regulator (ethephon 480 g ha–1) and both treatments associated. Growth, accumulation of carbohydrates in leaves and culms were measured. It can be concluded that the effects of ethephon on sugarcane are genotype-dependent. Ethephon stimulates sucrose accumulation in the culm and the photosynthate supply by the source in the responsive variety (IACSP95-5000). Such effects are not associated with growth restriction. In relation to the drought combined with the application of ethephon, the responsive variety shows increased sucrose content in culm at the same level as when ethephon is applied alone, hence treatments have no additive effects on sugarcane ripening.

KW - Saccharum spp

KW - source-sink relationships

KW - sucrose

KW - plant growth regulators

U2 - 10.1590/1678-4499.0062

DO - 10.1590/1678-4499.0062

M3 - Journal article

VL - 74

SP - 379

EP - 386

JO - Bragantia

JF - Bragantia

SN - 1678-4499

IS - 4

ER -