Armazenamento e germinação de sementes de uvaia Eugenia uvalha Cambess

Abstract

This work has as objective to test storage time and temperature and pre germinative treatments on germination of Eugenia uvalha Cambess. Seeds were separated in lots of 100 units, which were weighted and follow they were stored in environment temperature (30±2ºC) and in the refrigerator at 13±2ºC inside plastic bottles with spiral lid. At the beginning of the experiment and at 30 days (30, 60, 90 and 120 days of storage) seeds were immersed for 30 minutes in hot water, GA 125 mg.L-1 and GA 250 mg.L-1 or control, and follow they were sowed in container which contained soil and sand (1:1) as substratum. Emergence percentage and emergence velocity index were evaluated. Experiment was carried out in a 2 (storage temperature) x 4 (storage periods) factorial scheme in a complete randomized block design with four replications of 25 seeds. Seeds stored under refrigeration showed in general higher percentage and emergence velocity index. Eugenia uvalha Cambess seeds recently gathered did not emerge until the end of 200 days of observation. Under environment temperature there was smaller emergence (32.14%) than those under refrigeration (40.37%). Regarding storage periods, the highest emergence was observed in seeds stored by 60 days under refrigeration (65.56%) and 90 days under environment temperature (52.03%). GA 125 mg.L-1 under refrigeration and GA 250mg.L-1 under environment temperature were pregerminative treatments with the highest emergence. Emergence velocity index was higher in seeds stored under refrigeration, and at 60 days (0.099) that index was higher compared with seeds stored by 90 days (0.069) under environment temperature. Regarding to pregerminative treatments, seeds immersed in gibereline reached the highest emergence velocity index (above 0.05).