Effects of temperature and pre-germinative treatments on seed germination of Talinum triangulare (Jacq. ) willd (Portulacaceae)

Brasileiro, Beatriz Gonçalves; Dias, Denise Cunha Fernandes dos Santos; Casali, Vicente Wagner Dias; Cecon, Paulo Roberto

doi:10.1590/s0101-31222010000400017

Cited by 3 publications

(2 citation statements)

References 20 publications

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“…Assim, há, na literatura, uma grande quantidade de trabalhos que avaliam aspectos do processo germinativo de sementes florestais, como as de ucuúba (Virola surinamensis) (Limas et al, 2007), cariru (Talinum triangulare) (Brasileiro et al, 2010) e coroade-frade (Melocactus violaceus) (Zamith et al, 2013).…”

Section: Introductionunclassified

Técnicas para superação da dormência de sementes de guanandi

Silva

Vieira

Panobianco

2014

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar tipos de preparo de sementes de guanandi (Calophyllum brasiliense), com vistas à superação da dormência física e mecânica, e verificar a influência da temperatura e do substrato sobre a germinação. Foram avaliados três substratos (papel, areia e vermiculita), duas temperaturas de germinação (25 e 30ºC) e quatro tipos de preparo das sementes: sementes íntegras; sementes nuas, sem tegumento e endocarpo; sementes com punctura no endocarpo, na região próxima ao eixo embrionário ou na região oposta ao eixo embrionário; e sementes cortadas a 1/3 da região oposta ao eixo embrionário. Foram realizados testes de vigor (índice de velocidade de germinação e emergência de plântulas em campo), e a curva de embebição foi obtida para os diferentes tipos de preparo da semente. A retirada total do envoltório (endocarpo e tegumento) é necessária para a completa superação da dormência física e mecânica das sementes de guanandi. A germinação das sementes deve ser realizada em substrato papel à temperatura de 30ºC.Termos para indexação: Calophyllum brasiliense, espécie nativa, germinação, madeira de lei, sementes recalcitrantes, testes laboratoriais. Techniques for overcoming dormancy in guanandi seedsAbstract -The objective of this work was to evaluate different types of preparation of guanandi (Calophyllum brasiliense) seeds, in order to overcome physical and mechanical dormancy, and to verify the effects of temperature and substrate on germination. Three substrates (paper, sand, and vermiculite), two germination temperatures (25 and 30ºC), and four seed preparation types were evaluated: whole seeds; bare seeds, without testa and endocarp; seeds with punctured endocarp in the region near the embryonic axis or in the region opposite of the embryonic axis; and seeds cut at 1/3 of the region opposite of the embryonic axis. Vigor tests were performed (index of germination speed and emergence of seedlings in the field), and the imbibition curve was obtained for the different types of seed preparation. Total wrap (endocarp and testa) withdrawal is necessary to completely overcome physical and mechanical dormancy of guanandi seeds. Seed germination should be held in paper substrate at a temperature of 30°C.

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Section: Introductionunclassified

Técnicas para superação da dormência de sementes de guanandi

Silva

Vieira

Panobianco

2014

Pesq. agropec. bras.

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“…(Talinaceae) is commonly known as 'bredo', purslane (Agra et al 2008), and water leaf (Aja et al 2010). The species has large populations and is used in the native cuisine and for medicinal purposes to treat or prevent diseases, increasing immunity due to its immunostimulatory activity (Brasileiro et al 2010). In Brazil, this species grows spontaneously or subspontaneously, forming subpopulations in open and ruderal areas.…”

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STYLAR MOVEMENT IN Talinum fruticosum (TALINACEAE): CONTRIBUTIONS TO THE REPRODUCTIVE SUCCESS OF THE SPECIES IN POPULATIONS FROM CENTRAL-WEST BRAZIL

et al. 2023

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In plant species, the movement of reproductive structures can be an adaptive advantage in mating system studies. This phenomenon can promote outcrossing or cause a reduction in intrafloral male-female sexual interference. Consequently, this contributes to the avoidance of self-pollination and/or delayed autonomous self-pollination. The aim of this short communication is to report the results of assessments done in two natural populations of a native species from central-west Brazil that grows spontaneously and sub-spontaneously in opening and ruderal areas of Pantanal. In this study, the movement of the stigma was recorded throughout floral anthesis, and the mating system was determined. Floral measurements such as: flower opening time, pollen viability and the period that the stigma was receptive were also reported. The formation of fruits by spontaneous self-pollination and cross-pollination reinforces the hypothesis that stylar movement in Talinum fruticosum can facilitate or hinder self-pollination in some situations.

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Dynamics in the emergence of dormant and non-dormant herbaceous species from the soil seed bank from a Brazilian dry forest

Souza

Aguiar

Santos

et al. 2020

Journal of Plant Ecology

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Aims In dry tropical forests, herbaceous species may have dormancy mechanisms and form persistent and transient seed banks in the soil. Evolutionarily acquired, these mechanisms are efficient for the establishment and survival of these herbs, especially in forests with unpredictable climates, such as the Caatinga. Thus, our objective was to verify whether the studied herbaceous species adopt the physical dormancy mechanism and how these natural barriers are overcome, to understand the temporal dynamics existing in the soil seed bank from a Brazilian dry tropical forest. Methods Seeds of five native herbaceous species from the Caatinga forests were selected and submitted to pre-germinative treatments for verifying the presence of physical dormancy. We collected soil samples in the rainy and dry seasons for four consecutive years and monitored the emergence of the selected herbaceous in the greenhouse. We verified the differences in germination and seed bank emergence in the soil by generalized linear models. Important Findings The presence and absence of physical dormancy were observed in seeds from Caatinga herbaceous species. We found intraspecific and interspecific differences in the herbaceous emergence from soil seed banks between years and climatic seasons. In perennial herbs, consecutive lack of emergence between seasons and years was frequent, which suggests a direct relationship with the mechanism of physical dormancy and the environmental conditions necessary to overcome integument barriers. In these species, seed dimorphism and dormancy may confer additional advantages to their survival. Moreover, presenting intermediate levels of physical dormancy in an annual species may be an evolutionary adjustment to rainfall unpredictability. In contrast, we found that the annual herb without dormancy is more sensitive to seasonal and interannual climate changes, as evidenced by the increase and significant reduction of its emergence in the soil seed bank. These differences acquired evolutionarily are advantageous for the establishment of herbaceous populations, mainly in semiarid regions with an unpredictable climate.

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Effects of temperature and pre-germinative treatments on seed germination of Talinum triangulare (Jacq. ) willd (Portulacaceae)

Cited by 3 publications

References 20 publications

Técnicas para superação da dormência de sementes de guanandi

Técnicas para superação da dormência de sementes de guanandi

STYLAR MOVEMENT IN Talinum fruticosum (TALINACEAE): CONTRIBUTIONS TO THE REPRODUCTIVE SUCCESS OF THE SPECIES IN POPULATIONS FROM CENTRAL-WEST BRAZIL

Dynamics in the emergence of dormant and non-dormant herbaceous species from the soil seed bank from a Brazilian dry forest

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