Journal of Food, Agriculture and Environment

Carbon compounds and chlorophyll contents in sorghum submitted to water deficit during three growth stages

Author(s):

Cândido Ferreira de Oliveira Neto ¹, Allan Klynger da Silva Lobato ^2*, Maria Celeste Gonçalves-Vidigal ², Roberto Cezar Lobo da Costa ¹, Benedito Gomes dos Santos Filho ¹, Gustavo Antonio Ruffeil Alves ¹, Wilson Jose de Mello e Silva Maia ¹, Flávio José Rodrigues Cruz ¹, Hadrielle Karina Borges Neves ¹, Monyck Jeane dos Santos Lopes ¹

Recieved Date: 2009-07-13, Accepted Date: 2009-10-12

Abstract:

The aim of this study was to evaluate the carbon compounds and chlorophyll contents in Sorghum plants (cv. BR-700) submitted to water deficit at vegetative, reproductive and maturation stages. The experimental design used was entirely randomized in factorial scheme, with 2 conditions (control and stress) combined with 3 stages (vegetative, reproductive and maturation; 30, 60 and 90 days after the beginning of experiment, respectively). The total soluble carbohydrates presented significant increases of 45.2 and 61.2% during vegetative and reproductive stages, respectively, and in maturation period a decrease of 62.2%. The sucrose level in stress plants presented the increases of 32.9 and 24.3%, respectively, in the vegetative and reproductive stages; and in maturation stage a reduction of 22.2 mg g DM^-1 to 11.0 mg. g DM^-1 under control and stress treatments, respectively. The water deficit affected significantly the chlorophyll a, b, total chlorophyll and carotenoid levels in all stages, as well as the decreases in total chlorophyll were 38, 28 and 60% in the vegetative, reproductive and maturation stages, respectively. The study revealed that the total soluble carbohydrates and sucrose presented similar behavior with increases in vegetative and reproductive stages, and in maturation significant decreases. Therefore, the increases were provoked by the mechanism of osmotic adjustment and the decreases occurred due to the transport of reserve compounds. The leaf relative water content and starch were reduced in all the evaluated periods. The chlorophyll a, b, total chlorophyll and carotenoids significantly decreased in all stages after the water restriction.

Keywords:

Sorghum bicolor L., water deficit, chlorophylls, carbohydrates, osmotic adjustment

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Journal: Journal of Food, Agriculture and Environment
Year: 2009
Volume: 7
Issue: 3&4
Category: Agriculture
Pages: 588-593

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