Dormência e germinação de sementes de Melaleuca alternifolia Cheel

Anselmini, Justina Inês; Deschamps, Cícero; Gavazza, Melícia Ingredi Araújo; Zanette, Flávio; Panobianco, Maristela

doi:10.1590/s1516-05722010000200004

Cited by 3 publications

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References 5 publications

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“…Since M. alternifolia seeds are extremely small and diffi cult to handle, information regarding the pattern of their germination and the eff ects of temperature on this process is very limited in the literature. M. alternifolia germination has been evaluated without, however, evaluating the eff ect of diff erent temperatures (Anselmini et al, 2010). The eff ect of temperature and of light on the species Melaleuca quinquenervia has also been evaluated, in which the temperature of 27.3 °C allowed maximum germination in the shortest period of time, and it is considered ideal for that species (Martins et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

GERMINATION AND POST-SEMINAL DEVELOPMENT OF Melaleuca alternifolia (MAIDEN & BETCHE) CHEEL

et al. 2020

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There is little information regarding the germination pattern, seed characterization, and seedling development of Melaleuca alternifolia. This study aimed to determine the ideal temperature for the germination of M. alternifolia seeds, as well as to characterize the seeds and the post-seminal development of the species. Three lots of M. alternifolia seeds were placed to germinate at 20, 25, 20-30, 20-35, 30, and 35 °C, with daily evaluations to determine germination rate, germination speed index (GSI), speed of germination (SG), and mean time for germination of 50% (t50) and 100% (t100) of seeds. The inner morphology of the seeds was evaluated through X-ray images and seedling morphology by photographs. Alternating temperatures (20-30 and 20-35 °C) led to germination rates higher than the other temperatures. The GSI had the lowest values at the constant temperature of 20 °C and the highest values at the constant 30 °C for all the lots. The SG was lowest at a temperature of 20 °C and the highest at the temperature of 35 °C. At alternating temperatures (20-30 and 20-35 °C), t50 was around 5 days and t100 reached 16 days. In conclusion, the alternating temperatures of 20-30 °C and 20-35 °C are recommended for germination of M. alternifolia, and final evaluation can be performed at 16 days after sowing. The inner structures of seeds could be visualized by X-ray analysis, and full seeds could be distinguished from empty seeds and impurities. Seeds exhibit epigeal germination and seedling development is stabilized after 30 days.

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Section: Introductionmentioning

confidence: 99%

GERMINATION AND POST-SEMINAL DEVELOPMENT OF Melaleuca alternifolia (MAIDEN & BETCHE) CHEEL

et al. 2020

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“…Biotic factors include seed resistance to desiccation, the presence or absence of dormancy (Vasconcelos et al 2011), fruit morphology, and seed predation (Sari & RibeiroCosta 2005). Viable seeds will not germinate even though all of the necessary environmental conditions have been met, a phenomenon known as seed dormancy (Anselmini et al 2010). Dormancy results in temporal delays in the germination process, and can aid the dispersal of seeds over greater geographic distances (Kaye et al1997).…”

Section: Introductionmentioning

confidence: 99%

Do fruit morphology and scarification affect germination and predation rates of Babassu seeds?

et al. 2016

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Seed predation is a natural phenomenon that can occur either before or after dispersal and can signifi cantly reduce the economic value and reproductive potential of plants. Th e babassu palm (Attalea vitrivir, Arecaceae) is important to rural communities that extract oil from its fruits for a wide variety of uses. We evaluated the predation and germination of A. vitrivirseeds in Pandeiros River Environmental Protection Area (EPA-Pandeiros) in Minas Gerais State, Brazil. Sixty individual plants were evaluated to determine their fruiting patterns. Seed predation and germination were evaluated in the natural environment for eight months for fruits divided into two treatments: scarifi ed and intact. Germination of fruits submitted to these same treatments was also evaluated under greenhouse conditions. Our results indicated that fruiting is continuous in this species and that fruit morphology does not infl uence either germination or predation. Likewise, fruit scarifi cation did not infl uence seed germination. Pachymerus cardo (Coleoptera: Chrysomelidae) preferentially oviposited on scarifi ed fruits, but only after their dispersal. Th e predation rate in the natural environment was 14.6%. Germination was not observed under natural conditions, but reached 33.05% under greenhouse conditions.

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Superação de dormência em sementes de manjericão (Ocimum basilicum L.)

Amaro

Assis

David

et al. 2012

Rev. bras. plantas med.

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RESUMO:O objetivo do trabalho foi avaliar a eficiência de tratamentos pré-germinativos na superação da dormência de sementes de manjericão, produzidas no Horto de Plantas Medicinais da Unimontes, em fevereiro de 2011. Foram realizadas as seguintes determinações para avaliação da qualidade fisiológica das sementes: teor de água, germinação, primeira contagem de germinação, emergência de plântulas e índice de velocidade de emergência. O delineamento experimental utilizado foi inteiramente casualizado com quatro repetições de 50 sementes por tratamento, sendo T1-testemunha; T2 -pré esfriamento das sementes em câmara tipo BOD sob temperatura de 10ºC por 4 dias; T3 -embebição das sementes em água destilada por 24 horas; T4 -embebição das sementes em solução contendo KNO 3 a 0,2 % por 5 minutos e T5 -sementes submetidas em água destilada a temperatura de 70ºC por 5 minutos. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste Scott -Knott a 5% de probabilidade. O tratamento pré esfriamento em câmara tipo BOD a 10ºC por 4 dias reduz a dormência e promove incrementos na qualidade fisiológica das sementes do manjericão. Palavras-chave: Ocimum basilicum L., tecnologia de cultivo, germinaçãoABSTRACT: Overcoming dormancy in seeds of basil (Ocimum basilicum L.). Aiming in order to assess the effectiveness of treatments to overcome dormancy in seeds of basil, an experiment was conducted at the Laboratory of Seed Analysis of Unimontes. Following determinations were performed to evaluate the physiological quality of seeds, water content, germination, first count germination, seedling emergence and emergence speed index. The experimental design was completely randomized design with four replications of 50 seeds per treatment, which consisted of: T1 -control, T2 -pre-cooling of the seed chamber BOD at a temperature of 10ºC for 4 days, T3 -soaking the seeds in water distilled for 24 hours, T4 -soaking the seeds in a solution containing 0,2% for 5 minutes and T5 -submitted seeds in distilled water at 70ºC for 5 minutes. Data were subjected to analysis of variance and the averages compared by Scott-Knott 5% probability. The pre-cooling treatment in BOD chamber at 10ºC for 4 days reduced dormancy and promotes increases in the physiological quality of seeds of basil.

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Dormência e germinação de sementes de Melaleuca alternifolia Cheel

Cited by 3 publications

References 5 publications

GERMINATION AND POST-SEMINAL DEVELOPMENT OF Melaleuca alternifolia (MAIDEN & BETCHE) CHEEL

GERMINATION AND POST-SEMINAL DEVELOPMENT OF Melaleuca alternifolia (MAIDEN & BETCHE) CHEEL

Do fruit morphology and scarification affect germination and predation rates of Babassu seeds?

Superação de dormência em sementes de manjericão (Ocimum basilicum L.)

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