Métodos De Superação De Dormência Em Sementes De Maxixe

Schmidt, Paula Michele da Silva; Nunes, Ubirajara Russi; Backes, Fernanda Alice Antonello Londero; Sangoi, Pablo Reno; Fagundes, Lovane Klein; Fernandes, Tiéle Stuker; Dalcin, J. S.

doi:10.32929/2446-8355.2017v26n1p53-60

Cited by 2 publications

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“…However, even though there was no difference in the germination percentage, mechanical scarification and chemical scarification (H 2 SO 4 ) 10 minutes showed higher values (14 % and 18%, respectively) of the first count (Table 2). According to Schmidt et al (2017), this parameter is generally associated with a higher vigor index in the batch related to the treatment. For overcoming physical dormancy, mechanical scarification initially proved to be a promising treatment, since the first germination was observed in this treatment on day 12.…”

Section: Resultsmentioning

confidence: 99%

Overcoming dormancy in seeds of Dietes bicolor (Steud.) Sweet ex Klatt

Borges

Silva

et al. 2022

Ornam. Hortic.

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Seminiferous propagation of Dietes bicolor is hindered by the probable physical and/or morphophysiological dormancy. The objective was to analyze the efficacy of different methods of overcoming dormancy in D. bicolor seeds to determine a possible pre-germination treatment for the species. Two experiments were conducted: (I) Evaluation of the breaking of physical dormancy, in which the treatments of mechanical scarification were carried using sandpaper #100; chemical scarification with sulfuric acid (H2SO4) for 5 and 10 minutes and immersion in hot water (70 ºC), also, for 5 and 10 minutes, were evaluated. The intact seed was considered a control. (II) Evaluation of morphophysiological dormancy, in which the seeds were submitted to combined treatments of stratification of hot temperature (20-35 °C) and/or cold temperature (9 ºC), distributed in periods of 0, 1, and 2 weeks, totalizing 9 treatments. In both experiments, germination percentage (G), germination speed index (GSI), and first count (FC) were determined, using a randomized block design, and evaluated by the Scott-Knott test at 1% and Dunnett’s test at 5%. The use of H2SO4 10 minutes induced 42% germination, 0.52 GSI, and 18% FC, but only FC was significantly different from the control. In the second trial, the treatment that spent only two weeks in hot temperatures (20-35 ºC) showed the highest germination (30%), compared to the control (G = 22%). These results provide relevant information for understanding the physiology of D. bicolor germination, in addition to contributing to the optimization of pre-germination practices for this important ornamental species.

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Section: Resultsmentioning

confidence: 99%

Overcoming dormancy in seeds of Dietes bicolor (Steud.) Sweet ex Klatt

Borges

Silva

et al. 2022

Ornam. Hortic.

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Overcoming Tegumentary Numbness in Seeds of Crotalaria spectabilis and Crotalaria paulinea

Maia,

Araújo,

Da Silva

et al. 2023

RGSA

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Objective: To evaluate the efficiency of dormancy breaking methods in seeds of C. paulinea and C. Spectabilis. Theoretical reference: Species of crotalaria, such as C. paulinea and C. spectabilis, found in the Brazilian territory, are used as green manure in large crops and vegetable productions. However, the presence of tegumentary hardness in their seeds can result in failures in soil cover, which favor the emergence of weeds. Method/design/approach: The research was carried out at the Laboratório de Análise de Sementes of the Departamento de Agronomia, at the Universidade Federal de Viçosa, Minas Gerais. Twenty treatments were applied to the seeds to break dormancy, using mechanical scarification with 120 grit sandpaper, hot water in an oven at 90 °C for five and seven minutes, and immersion in sodium hypochlorite at four concentrations, 2%, 4%, 6% and 8%, for four times, two, four, six and eight hours. Results and conclusion: The most efficient treatments for breaking this dormancy in both species of crotalaria were scarification with sandpaper and immersion in water at 90±3 °C for seven minutes. Treatments using sodium hypochlorite were not effective in reducing the number of hard seeds. Originality/value: Feasibility of the methods applied to break dormancy in seeds of C. paulinea and C. Spectabilis, since they are used for green manure, and control of Aedes aegypti, among other purposes.

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Métodos De Superação De Dormência Em Sementes De Maxixe

Cited by 2 publications

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Overcoming dormancy in seeds of Dietes bicolor (Steud.) Sweet ex Klatt

Overcoming dormancy in seeds of Dietes bicolor (Steud.) Sweet ex Klatt

Overcoming Tegumentary Numbness in Seeds of Crotalaria spectabilis and Crotalaria paulinea

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