Teor de proteína e curva de hidratação em auxílio à determinação da qualidade fisiológica de sementes de arroz

• Main Author: Bortolotto, Rafael Pivotto
• Publication Date: 2007
• Format: Master thesis
• Language: por
• Source: Biblioteca Digital de Teses e Dissertações do UFSM
• Download full: http://repositorio.ufsm.br/handle/1/5094
• topic: Oryza sativa; Testes de vigor; Germinação; Oryza sativa; Vigor test; Germination; CNPQ::CIENCIAS AGRARIAS::AGRONOMIA

This work aimed to evaluate the protein content and hydration curve as aiding tools in the determination of the physiological quality of rice seeds, as well as correlate them with emergency in field. Six lots of rice seeds were used, being that, three lots were of cultivar IRGA 417 and three lots of cultivar IRGA 422 CL, which were submitted to a set of tests in order to measure the following physiological potential of the lots: germination, first counting of the germination test, cold test (without soil), accelerated aging, electrical conductivity, length and dry mass of seedlings. After determining the initial quality of the lots, a new set of tests such as crude protein content, evaluations of the seedlings and plants in the field and hydration cur ve were carried out. We can conclude that crude protein content is able to identify differences between the lots of rice due to the quality of the seeds. Therefore, it is a promising determination that comes to aid conventional tests in the evaluation of the physiological potential of the rice seeds. The physiological quality affects the water content reached by the rice seeds during hydration, being that, seeds with lower vigor present lower speed and water content up to 24 h, when compared to seeds with higher vigor. The protein content is not correlated to the germination and emergency of the seedlings in the field, except when the emergency occurs in unusual conditions. The vigor tests of the first counting of the germination, accelerated aging and applied to rice seeds are correlated to the emergency in field and the establishment of the plants at 21 days after sowing.