Accelerated aging as test of vigor for rice seeds

Abstract

The objectives of this study were to examine the methodology of the accelerated aging test and verify the possibility of using NaCl as an option for control of water uptake by seeds during the test. Five lots of seed were tested for germination (G), seedling emergence (SE)​​, index of emergence speed (IES) and accelerated aging (AA). The periods of exposure used were 24, 48, 72, 96 and 120h, with and without saline solution (NaCl). The use of unsaturated and saturated solution of NaCl decreased water uptake by rice seeds during accelerated aging. The use of these solutions decreased deterioration rate and the results were less drastic and more uniform. The periods of exposure of 48h with unsaturated solution and 24 with saturated NaCl solution must be used because they promote a better stratification of seed lots of rice. Accelerated aging is considered an excellent option as a vigor test when compared to seedling emergence and index of emergence speed because the shortest time of acquisition and efficient results.