Emergência, desenvolvimento da plântula e tolerância ao dessecamento de sementes de socoró (Mouriri guianensis Aubl.).

Abstract

Socoró is a fruit tree often found on the banks ofrivers, whose fruits are appreciatedby aquatic fauna, with potential for use in the recovery of riparian forest. This work aimed toevaluate the biometrics and emergence of seeds of different socoró genotypes, as well as describeand illustrate the seedling in development, and to classify the seeds according to desiccationtolerance. Initially, biometrics and emergency test were evaluated, following a completelyrandomized design (CRD), with four treatments (genotypes) and four replicates. Seedlingdevelopment was monitored from the appearance of the primary root to the of expanded secondeophyll. For the classification of seeds according to desiccation tolerance, an emergency test inCRD was installed, with four treatments (moisture contents: 36.9; 22.3; 10.7 and 5.3%) and fourreplicates. Additionally, seeds with moisture contents of 5.3% were stored for three months attemperature of -18 °C, and subsequently subjected to the emergence test. The genotypes showeddifferent behaviors with respect to seed biometry, emergence, emergence speed index, abnormalseedlings, dormant and dead seeds. Germination is hypogeal, cryptocotyledon and unipolar type,with the emission ofthe primary root at 24 days and the expansion ofthe second eophyll at 52 daysafter sowing. The seeds tolerate desiccation to a moisture level of 5.3%, plus cooling for threemonths at -18 ºC. Socoró genotypes differ in biometry, emergence, vigor and dormancy seeds. Theseedling structures can assist in the identification of the species in the field, or in laboratoryanalysis. The seeds have orthodox behavior.