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Journal of Biological Sciences
Year: 2008  |  Volume: 8  |  Issue: 1  |  Page No.: 113 - 118

Physiological and Morphological Adaptations in Two Rice Varieties Cultivated Under Ammonium and Light Deficiency

Rodrigo Grazinoli Garrido, Fabiola de S.R.G. Garrido, Sonia Regina de Souza and Manlio Silvestre Fernandes    

Abstract: In this study, two rice varieties were evaluated: Piaui and IAC-47. Piaui is adapted to Humid Tropic environmental conditions, where there is N deficiency and low light since rice is planted. IAC-47 is an improved variety. This research aimed to characterize physiological and morphological adaptations observed during vegetative growth under low ammonium-N nutrition and low light in both varieties. To analyze it, developmental parameters, soluble sugars content, amino-N, NH4+, total-N and pigments were compared between varieties. The assay was carried out in controlled growth chamber conditions, at 24°C and 12/12 h light/dark periods (200 μE m-2 sec-1). Rice plants were grown in nutrient solution until 26 Days After Germination with a modified Hoagland and Arnon. All plants received two treatments with NH4+-N 0.1 and 1.0 mM, pH 5.5. Under these conditions, Piaui plants presented longer roots, chlorophyll a+b enhances, soluble sugars levels reduction and free amino-N content increases, what would be important for its adaptation to low N and low light environments, found in Humid Tropic rice culture. In spite of this, IAC-47, selected for high nutrient and light availability, presented typical senescence symptoms.

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