Study of storage on seed germination of Chresta sphaerocephala DC. – Asteraceae

Abstract

High-altitude fields have been subjected to an intense anthropization process. Due to this, studies on germination, seed storage and propagation of species that compose this plant formation become fundamental. Among such species is the Chresta sphaerocephala DC., Asteraceae. The purpose of this work was to study different temperatures for germination and storage of this species. Four germination temperatures (15°C, 20°C, 25°C and 30°C) and two storage temperatures (-5°C and +5°C) were tested. In order to assess seed vigor, the germination speed index (GSI) and average seed germination time were calculated. ANOVA and Tukey's test were performed at a 5% significance level. In addition, a morphological difference was observed in the analyzed Chresta sphaerocephala seeds, with these being classified as C1 (small seeds), C2 (long thin seeds), C3 (thicker seeds) and C4 (dark colored seeds). As for the storage temperature, 5°C was shown to be the best. When correlated with the germination temperature, 20°C resulted in a statistically higher number of germinated seeds.

The cultivation environment influences the physiological quality of stored Sonchus oleraceus L. seeds

“…Germination speed is an intrinsic parameter, strongly associated with seed vigor and longevity. In this case, it is assumed that such seeds reached greater vigor and longevity for as long as the seeds have conserved their viability, possibly due to a greater accumulation of reserves (Sousa et al, 2021).…”