Alterações bioquímicas durante a embebição de sementes de baraúna (Schinopsis brasiliensis Engl.)

Dantas, B. F.; Aragão, Carlos Alberto

doi:10.1590/s0101-31222008000200027

Cited by 14 publications

(7 citation statements)

References 12 publications

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“…Relatively low concentrations of starch reserves were found in Schinopsis brasiliensis seeds, with a low consumption after phase II of water uptake during germination (Dantas et al, 2008b). In Caesalpinia peltophoroides, starch content showed a slight reduction during germination and seedling growth (Corte et al, 2006).…”

Section: Resultsmentioning

confidence: 99%

Alterations in seed reserves of Dalbergia nigra ((Vell.) Fr All. ex Benth.) during hydration

et al. 2013

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Seed imbibitions is the first stage of the germination process and is characterized by the hydration of tissues and cells and the activation and/or induction of the enzymes responsible for mobilizing reserves for respiration and the construction of new cell structures. The objective of this study was to investigate the alterations in reserve substances during slow hydration of Bahia Rosewood (Dalbergia nigra) seeds in water. Seeds from two different lots (Lot I and II) were placed in saturated desiccators (95-99% RH) to hydrate at 15 and 25 °C until water contents of 10, 15, 20 and 25% were reached. At each level of hydration, changes in lipid reserves, soluble carbohydrates, starch and soluble proteins were evaluated. The mobilization of reserves was similarly assessed in both lots, with no differences being observed between the two hydration temperatures. Lipid contents showed little variation during hydration, while the contents of soluble carbohydrates and starch decreased after the 15% water content level. Soluble proteins showed a gradual tendency to decrease between the control (dry seeds) up to 25% water content.

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Section: Resultsmentioning

confidence: 99%

Alterations in seed reserves of Dalbergia nigra ((Vell.) Fr All. ex Benth.) during hydration

et al. 2013

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“…After approximately 280 hours (right arrow in Figure 1) 10% of seedlings had root protrusion and a sharp increase in seeds water uptake begun. At this stage, embryo starts axis its growth and seedlings newly formed cells require large volumes of water (Dantas et al, 2008a;2008b;Borges et al, 2009;Smiderle et al, 2013). These results showed guava seeds do not have dormancy, because only non-dormant and viable seeds reach phase III of imbibition curve (Bewley et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Seed germination of Brazilian guava (Psidium guineense Swartz.)

et al. 2015

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ABSTRACT-Brazilian guava (Psidium guineense Swartz.) is a plant species native from Brazil and present in all Brazilian biomes. This species occurs in the Caatinga biome as a wild fruit that has broad utility and can generate income, as well as provide material for breeding. The objective of this work was to study seed germination of guava accessions collected in two municipalities in Bahia. Seeds imbibition curve was studied. Also, seed germination and seedlings initial growth were evaluated for 44 days on different temperatures (15, 20, 25, 30 and 35 °C), fruit maturation, drying, pre-soaking and priming. Seeds imbibition curve was triphasic in which lag-phase begun after 30 hours imbibition and lasted 256 hours. An effect of guava genotype was observed in seeds physiological quality. Temperatures of 20 and 25 °C were ideal for guava seeds germination. Seeds pre-soaking and priming techniques are feasible to reduce germination time and increase seedling performance.Index terms: genetic resources, Myrtaceae, vigor.Germinação de sementes de araçá (Psidium guineense Swartz.) RESUMO-O araçá (Psidium guineense Swartz) é uma espécie nativa do Brasil e presente em todos os biomas brasileiros. Ocorre na Caatinga de forma silvestre e é uma fruteira que apresenta ampla utilidade, podendo gerar renda além de fornecer material para o melhoramento genético. O objetivo deste trabalho foi estudar o processo germinativo de sementes de quatro acessos de araçá coletados em dois municípios da Bahia. Foi estudada a curva de embebição das sementes, bem como o efeito de diferentes temperaturas (15, 20, 25, 30 e 35°C), estágio de maturação, secagem, pré-embebição e condicionamento osmótico na germinação, vigor e crescimento inicial de plântulas dos acessos de araçá. A curva de embebição das sementes se mostrou trifásica, na qual a fase-lag iniciou após 30 h de embebição e durou 256 h. Foi observado um efeito dos genótipos na qualidade fisiológica das sementes de araçá. As temperaturas de 20 e 25 °C foram ideais para a germinação de sementes de araçá. As técnicas de pré-embebição e condicionamento osmótico das sementes reduziram o tempo de germinação e aumentaram o desempenho das sementes.Termos para indexação: recursos genéticos, Myrtaceae, vigor.

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“…However, the water loss process was slow, since the water content remained at 38.05% after drying for 24 h (Figure 3) and it reduced to 37.22% at the end of 72 h. After this period, the water content of the seeds Dantas et al (2008b) reported a similar result for the imbibition of the baraúna (Schinopsis brasiliensis Engl.) seeds.…”

Section: Assay 2 Effect Of Drying On Seed Vigor and The Initial Growmentioning

confidence: 68%

Physiological performance of cagaita seeds (Eugenia dysenterica DC.) Subjected to drying

Silva¹,

Sales²,

Santos

et al. 2017

SCA

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The present study aimed to determine the imbibition curve and evaluate the effects of 'reducing the water content of cagaita seeds (Eugenia dysenterica DC.), using the radiographic image analysis technique. To this end, three assays were carried out: seed imbibition curve and root protrusion were determined in assay 1. Seeds in silica gel were oven dried for to 72 h and were then analyzed for water content and vigor in assay 2. Seeds were dried up to certain levels of the water content and were evaluated by radiographic imaging analysis in assay 3. A rapid mass gain was observed in the first 60 imbibition hours and the root protrusion reached 94.4% after 192 imbibition hours. Cagaita seeds did not tolerate drying periods longer than 24 h, which corroborates the recalcitrant behavior of the seeds of these species. The analysis of the radiographic image obtained by an X-ray test allowed the establishment of a direct relation between the increased free space area within the seed and the decrease in the seedling emergence. The drying process altered the internal morphology of the seed and such changes directly influenced the development of the seedlings. Key words: Native fruit. Myrtaceae. Drying. Recalcitrant. X-ray test. ResumoObjetivou-se com este trabalho determinar as relações entre níveis de absorção de água e a germinação, bem como, avaliar os efeitos da redução do teor de água no vigor de sementes de cagaita (Eugenia dysenterica DC.). Para tanto, foram realizados três ensaios: No ensaio 1 determinou-se a curva de embebição e germinação das sementes. No ensaio 2 as sementes foram submetidas a secagem em estufa e em sílica gel por até 72 horas e submetidas a avaliações do teor de água e do vigor. No ensaio 3 as sementes foram submetidas a secagem até determinados teores de água e avaliadas por meio da análise de imagens radiográficas. Houve um rápido ganho de massa nas primeiras 60 horas de embebição, com protrusão radicular chegando a 94,4% após 192 horas de embebição. As sementes de cagaita não toleraram secagem por períodos superiores a 24 horas, reafirmando o comportamento recalcitrante das sementes da espécie. A partir da análise de imagens radiográficas, obtidas pelo teste de Raios X, foi possível estabelecer relação direta entre o aumento da área de espaço livre no interior da semente, e a diminuição da emergência de plântulas. Palavras-chave: Frutífera nativa. Myrtaceae. Secagem. Recalcitrante. Teste de raios X.1 Parte da Tese de Doutorado do primeiro autor.

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Alterações bioquímicas durante a embebição de sementes de baraúna (Schinopsis brasiliensis Engl.)

Cited by 14 publications

References 12 publications

Alterations in seed reserves of Dalbergia nigra ((Vell.) Fr All. ex Benth.) during hydration

Alterations in seed reserves of Dalbergia nigra ((Vell.) Fr All. ex Benth.) during hydration

Seed germination of Brazilian guava (Psidium guineense Swartz.)

Physiological performance of cagaita seeds (Eugenia dysenterica DC.) Subjected to drying

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