SOUZA, M. A. S.; http://lattes.cnpq.br/5978269923170796; SOUZA, Maria Amélia Santos de.
Resumen:
The present study seeks to answer the following question: What is the moisture seed content
under which the loss of viability and vigor of Cynophalla flexuosa seeds post dispersion
occurs? And how long after the harvesting and subsequent drying in the sun and shade do
the seeds suffer compromise in viability and vigor? The hypothesis tested was that
Cynophalla flexuosa seeds are recalcitrant and short-lived. Seeds were harvested and given
different management to them, in April of 2015, when the spontaneous fruit opening in the
trees began. Two experiments were carried out: in experiment 1 the harvested seeds
remained inside the fruits for drying in the shade, and after two days were removed from the
fruits, and continued in the shade. Samples were taken for moisture content and emergency
determination, repeated daily. In experiment 2, the seeds were removed from the fruits on
the day they were harvested, samples were taken for emergency tests and moisture content,
and later placed in full sun for drying and performed tests mentioned above daily. The
treatments consisted of the time, in days, after the drying of the seeds. Four replicates of 25
seeds were used for the emergency test and three replicates of 30 seeds for moisture
content. The results pointed out that the critical moisture content of seeds dried in the shade
was 30%, reached on the sixth day, and the lethal moisture content was 23%, on the seventh
day, with emergence of 32% and 0% for the respective moisture contents. In sun-dried seeds
the critical content was 27%, reached on the third day and 16% lethal on the fourth day, with
emergencies of 19% and 0%, respectively. The IVE for both managements underwent
changes, with the decrease of the moisture content with values of 1.24 to 0 for the seeds
dried in the shade, and the dry ones in the sun of 1 to 0. The decrease in moisture content
affects seedlings root growth, shoot height and total dry mass. It was found that after three
days the sun dried seeds suffer compromise in viability and vigor and when shade dry, after
six days. The hypothesis tested confirms that the seeds of Feijão Bravo are recalcitrant and
short-lived because they lose viability if they are dehydrated.