VIABILIDADE DE CLONES DE SEMENTES DE SERINGUEIRA SOB PERÍODOS DE ARMAZENAMENTO

Abstract

Rubber tree seeds are recalcitrant, that is, they quickly lose their germination power, especially when their water content is reduced to values below 30%, making the use of seeds unfeasible when subjected to long periods of storage. In this sense, the objective was to evaluate the viability of rubber tree seed clones under storage periods. The seeds were placed in polyethylene bags and stored in a refrigerator. The experiment was carried out in a completely randomized design, in a 4 x 4 factorial scheme. The treatments were: four seed storage periods: 0, 25, 50, 75 days; and four clones: RRIM 600, PR 255, PB 235 and GT1, with 4 replications, 25 seeds per replication totaling 100 seeds per clone. The analyzes performed were: emergence, emergence speed index, weight of a thousand seeds, electrical conductivity, stem diameter, number of leaves and plant height. The experiment was carried out in a protected environment, in a bed with washed sand, with a sawdust cover, at Instituto Federal Goiano - Campus Ceres. The data were subjected to analysis of variance at 5% probability, and the clone factor means were subjected to Tukey's test and the means of the storage period factor were subjected to regression analysis. Statistical analyzes were performed with the aid of Sisvar version 5.6. Seed vigor for field emergence variables, electrical conductivity and IVE of rubber tree clones decreased according to the storage period. The seeds of the PR255 and GT1 clones can be stored for up to 50 days in polyethylene containers in a refrigerator, as long as the humidity level is above 30%. The rubber tree clone RRIM600 showed higher seedling height.