Germinação e vigor de sementes de alfavaca-cravo (Ocimum gratissimum L.) submetidas ao envelhecimento acelerado

Abstract

Germinação e vigor de sementes de alfavaca-cravo (Ocimum gratissimum L.) submetidas ao envelhecimento acelerado AbstractThe present work had as objective to verify the effect of treatment with fungicide on the germination and vigor of four lots of clove basil seeds, submitted to the traditional aging and with saturated salt solution, for periods of 36, 48, 60 and 72 hours, at 42ºC. After these periods, the seeds were evaluated by the germination test, using the first count of the number of normal seedlings as vigor indicative. The vigor and the germination of the seeds decreased as increased the time of aging. In the use of saturated salt solution, the seeds water content was lower and more uniform. The fungicide treatment increased the percentage average of germination, without provoking significant modifications in the contrasts among the lots. The periods of 36 and 48 hours were efficient in evaluating of the physiologic quality of the clove basil seeds.

Cardinal temperatures for the germination of Chorisia speciosa A. St.-Hil.. and parameters of the accelerated aging test for determination of vigor

“…High temperatures in the aging test promoted more drastic effects on germination than the prolongation of the period of exposure to aging (Tomes et al, 1988). Similar results were observed by Borges et al (1990) studying seeds of Cedrela fissilis L.. Lima et al (2006) studied seeds of Ocimum gratissimum L.. and Fanti and Perez (1999) seeds of Adenanthera pavonina. All these authors reported similar results.…”

Methodological adjustment of the accelerated aging test to evaluate the vigor of chia seeds

“…This can be probably explained by the nature of the lots studied, and also by the particularities of the test in this species, which is still poorly studied, so its behavior is not completely understood. In this very sense, in a study performed with clove basil seeds (Ocimum gratissimum L.), Lima et al (2006) verified that intervals of 36 and 48 hours of accelerated aging at 42 ºC combined with saline solution were effective in evaluating their physiological quality.…”

“…Journal of Seed Science, v.40, n.2, p. [173][174][175][176][177][178]2018 is different from the results of Lopes et al (2013) and Kikuti and Marcos-Filho (2008) on eggplant and cauliflower seeds, respectively, in which they concluded that the accelerated aging test can be conducted by the traditional method, for 48 hours at 41 °C.…”

“…Among the proposed methods, the accelerated aging test is promising and shows practical interest (Lima et al, 2006), besides being recognized as one of the most used to assess the physiological potential of seeds of several species, such as lettuce and eggplant (Santos et al, 2011;Lopes et al, 2013), providing highly consistent information (Tunes et al, 2013). The test is based on the artificial acceleration of seed deterioration through the exposure to high temperature and relative humidity conditions, which are considered as the environmental factors that most affect the intensity and speed of deterioration (Marcos-Filho, 2015b).…”

Germinação e envelhecimento acelerado na análise da qualidade fisiológica de sementes de alfavaca-cravo

“…A planta é indicada no tratamento de gripes, tosses, irritações da garganta e aromatizante bucal (MATTOS et al, 2000). Apresenta sementes muito pequenas com baixo percentual germinativo, dificultando o manuseio e a avaliação de sua qualidade fisiológica (LIMA; BELLETTINI, 2006;ROCHA et al, 2000;FIALLO;MEDINA;FERRADÁ, 1996). Desse modo, a definição de metodologia para a análise destas sementes é fundamental para subsidiar a produção de mudas de alfavacacravo com qualidade.…”