Vigor de sementes de cenoura recobertas com bioestimulante de Solieria filiformis

Abstract

To guarantee seeds with high physiological quality performing in a uniform, resilient and tolerant to abiotic stress plant stand, procedures that can improve the potential of the processed seed. Biostimulants are considered promising alternatives, both to improve the physiological performance of plants and in resilience and stress tolerance. The objective of this study was to verify the effect of coatingseeds of different cultivars of carrots with biostimulant based on algae Solieria filiformison seed germination and seedling development under thermal stress. The experiment was conducted in a completely randomized design, with a 3 x 4 factorial scheme (temperaturesand doses), with five replications. Carrot seeds from the cultivars Brasília, Danvers, Esplanada and Planalto were used, and the seeds were coated with doses of 0, 2, 4 and 8 mL.L-1 of biostimulant. After covering, the seeds were submitted to the following: percentage and speed of germination, length of seedlings and dry mass of seedlings. The results obtainedwere found in the analysis of variation and in the analysis of regression (doses) and Tukey's test (moderate). The analysis and interpretation of the results obtained in the present study allowed to conclude the high thermal stress, for all varieties, at a temperature of 35 ° C, to reduce the reduction of the analyzed variables. Furthermore, the covering of carrot seeds with the biostimulant of Solieria filiformis, in general, does not promote improvements in seed germination and in the development of carrot seedlings under thermal stress (35 °C); however, we present beneficial results for the variables analyzed at 20 and 30 ° C.

Effect of biostimulants and bioactivators on reproductive parameters of Daucus carota (L.)

“…Promising studies with other biostimulant compounds were also described by Vieira et al (2021) evaluating the inoculation of carrot seed cultivars 'Brasília, Danvers, Splanada, and Planalto' with an extract based on S. filiformis algae and additional micronutrients 7.5% Mn and 13% S in variable doses 0, 2, 4 and 8 mL L -1 . In this study, the authors found averages higher than the control at temperatures ranging between 20-30 ºC, with germination rates and germination speed, length of the aerial part and roots, and aerial and root dry mass encouraging for the carrot cultivars analyzed in vitro.…”

“…Inoculation with plant regulator gibberellin (GA3) was tested by Bevilaqua et al (1998) with a dose of 100 mL L -1 in D. carota seeds, where they observed encouraging results on the acceleration of seed metabolism to a greater extent than vigor and better values in germination rates, emergence speed index and seed length aerial part. Promising results were also found by Vieira et al (2021) where they evaluated the Solieria filiformis algae extract in inoculated D. carota seeds, the researchers demonstrated that the extract has effective biostimulatory activity on the development of carrots grown between 20-30 ºC.…”