Abstract

VINDAS QUESADA, Edgar Jesús; MONGE VARGAS, Andrés Antonio; PORRAS MARTINEZ, Carolina  and  BARBOZA BARQUERO, Luis. Physiological seed quality of carrot (Daucus carota L.) assessed by vigor testing. Agron. Mesoam [online]. 2022, vol.33, n.spe1, 51541. ISSN 2215-3608.  http://dx.doi.org/10.15517/am.v33iespecial.51541.

Introduction. In carrot cultivation direct sowing is practiced because the seedling cannot resist the stress of transplanting. It is essential to use seeds that germinate in a maximum of seven days and uniformly. Seeds vigor is associated with yield performance in the field and, at the international level there are different test to measure it. However, in carrot, the methodologies are still scarce and are not standardized. Objective. To determine the physiological quality in seeds of two varieties of carrot (Daucus carota L.) by mean of vigor tests. Materials and methods. This research was carried out at the Centro para Investigaciones en Granos y Semillas (CIGRAS) of the Universidad de Costa Rica in 2018. Seeds of Bangor and Triunfo varieties with moisture percentages of 7 %, 10 %, and 13 % were used. The vigor tests used were the following: radicle protrusion, first germination count (seven days), accelerated aging, electrical conductivity, and the germination analysis by digital images. Pearson's correlation analyses were performed between the variables studied. Results. Significant correlation coefficients (Pearson's r) were observed for electrical conductivity with variables obtained from the image analysis: t10 (r=0.83), t50 (r=0.87), and the area under the curve (r=-0.72). Trough the electrical conductivity test, it was determined that the Bangor lot had greater vigor than the Triunfo lot (Tukey, p≤0.05). Conclusions. The analysis of digital images and the electrical conductivity tests allowed measuring the vigor in seed lots of Bangor and Triunfo varieties, and complementing them with germination results to determine their physiological quality.

Keywords : electrical conductivity; humidity; image analysis; correlation; germination; physiological quality.

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