Desempenho de genótipos de mamoeiro quanto à qualidade física e fisiológica de sementes e análises de diversidade

Abstract

The objective of this study was to evaluate the seeds performance in eight Carica papaya genotypes, before and after accelerated aging test. We evaluated the seeds physical characteristics: humidity, length, diameter and weight of thousand seeds. Not aging seeds (control) and seeds subjected to accelerated aging test (43 º C for 72 h) were germinates in paper roll germitest and maintained in BOD at 20-30 º C. From the daily count, was evaluated the germination percentage and frequency, the speed of germination index, germination time, and the normal plants percentage. After 30 days of culture were evaluated lengths of shoot and root, fresh and dry weight of seedlings. In control seeds, the Caliman 01 genotype had higher percentage, speed and uniformity of germination, and higher normal seedlings percentage. Seeds of the Hybrid JS12 x Waimanalo genotype showed higher vigor after aging (84% of germination and 93% of normal seedlings). The diversity analysis identified as dissimilar the Caliman 01 genotype in control seeds and the Hybrid JS12 x Waimanalo genotype in after aging seeds. This genotypes have higher performance based on assessments of physical and physiological quality of seeds and diversity analysis in this conditions. The germination time was the feature that most contributes to the separation of genotypes in control seeds, and the root length in after aging seeds.