Respiratory rates and freezing tolerance of embryos of Inga vera Willd. subsp. affinis (DC.) T.D. Penn. from different regions

Lamarca, Edmir Vicente; Barbedo, Claudio José

doi:10.1590/2317-1545v43247247

Cited by 3 publications

(2 citation statements)

References 24 publications

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“…Mas a habilidade de tolerar a dessecação e o armazenamento em baixas temperaturas desenvolvese nas semen tes durante a maturação e depende das condi ções em que as sementes foram formadas, conforme foi demonstrado para I. vera subsp. affinis (Lamarca & Barbedo, 2021) que também atinge a maturidade fisiológica com elevados teores de água e que podem apresentar varia ção na capacidade de dessecação, de acordo com as condições ambientais em em as semen tes se formam (Lamarca & Barbedo, 2015).…”

Section: Discussionunclassified

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Maturação de frutos e sementes de sapucaia (Lecythis pisonis Cambess. - Lecythidaceae)

Duarte¹,

Almeida²,

Santos³

et al. 2022

Rev. Biol. Neotrop.

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Estudos de maturação são importantes para definir o momento de colheita, para tanto objetivou-se avaliar a maturação de frutos e sementes de Lecythis pisonis. Estudou-se frutos e sementes 1, 2, 3, 4 e 5 meses de idade, avaliou-se a morfologia e a morfometria, a massa das sementes nos frutos (%), o teor de água (%) e a massa seca (g) e a composição química das reservas nas sementes com 4 e 5 meses. No teste de emergência determinou-se as plântulas emergidas, a protrusão das raízes, a mortalidade e a dormência. Os frutos tornaram-se elítico-ovóides após 2 meses, distinguindo a região mediana em que está presente a calicina e uma constrição que marca o opérculo. As sementes ariladas se formaram em quatro lóculos. As sementes inicialmente hialinas, tornaram-se marrons aos 4 meses e o embrião foi observado após 3 meses, mantendo-se indiferenciado e envolto pelo endosperma, com reservas lipídicas. Sementes com 5 meses apresentaram 60,3% de água, a máxima massa seca (3 g), a máxima emergência (67,0 ± 15,3%) e a menor mortalidade (9%), contudo, exibiram 9% de dormência. A maturidade morfológica de frutos e sementes é alcançada aos 4 meses, mas a maturidade fisiológica das sementes ocorre aos 5 meses.

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Section: Discussionunclassified

“…Penn. (Lamarca & Barbedo, 2021) amplian do para 36 o número de espécies vegetais in vestigadas quanto à maturação das sementes.…”

Section: Introductionunclassified

Maturação de frutos e sementes de sapucaia (Lecythis pisonis Cambess. - Lecythidaceae)

Duarte¹,

Almeida²,

Santos³

et al. 2022

Rev. Biol. Neotrop.

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Active metabolism during desiccation of the desiccation tolerant short-lived seeds of Poincianella pluviosa (DC.) L. P. Queiroz

et al. 2022

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During embryogenesis and seed filling, developing seeds are metabolically highly active, while at the desiccation stage of tolerant seeds a decreased metabolism is expected. Seeds of Poincianella pluviosa present an extensive maturation cycle (11 months), longer than seed storability at room temperature (8 months). The metabolic profile of these seeds was characterized during maturation and drying, focusing in their role on seed behavior after shedding. Distinct responses of the embryonic axes and cotyledons to drying were observed depending on the developmental stage. Low proportions of tricarboxylic acids intermediaries until maturity indicated a low respiratory metabolism prior to the desiccation stage. Changes in shikimate, 4-coumarate, and quinate proportions suggest a metabolic shift towards the synthesis of chlorogenate isomers, found in high proportions in dispersed seeds. High proportions of lactate and glycerol were observed in immature seeds after artificial drying, but also in naturally dried axes of dispersed seeds. This suggests an active metabolism prior to drying and an osmotic stress under hypoxia, mechanisms that were never described before in desiccation-tolerant seeds. The results indicated that P. pluviosa seeds are dispersed with an incomplete metabolic switch-off, which can be related to their short lifespan.

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Atmosphere modification system for respiration analysis of recalcitrant seeds during storage

Manoel,

Tiné,

Guardia

et al. 2024

J. Seed Sci.

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The modification of atmosphere composition is a strategy to prolong the storage of organisms susceptible to senescence. Atmospheres with high levels of carbon dioxide could be applied to prolong the viability of recalcitrant seeds, which are in a constant process of deterioration due to intense metabolic activity. However, there is a need to develop methods that allow the standardized generation of these modified atmospheres to isolate the effect of low oxygen from high carbon dioxide. In this study, the generation of modified atmospheres was carried out by experiments with insufflated gas (IG) or compensated vacuum (CV), on recalcitrant Inga vera embryos as an experimental model. In IG, CO2 and N2 were uninterruptedly injected into a mixing chamber, in which the gases underwent turbulence to be homogenized and subsequently applied to the flasks where the embryos were incubated. In CV, the embryos were placed in flasks, from which a fraction of the air present inside was removed, and subsequently, the gases of interest were injected in defined fractions. The CV method proved to be more efficient and it was possible to restrict the respiratory metabolism of the Inga vera embryos by reducing respiration with the increase in carbon dioxide applied exogenously.

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Respiratory rates and freezing tolerance of embryos of Inga vera Willd. subsp. affinis (DC.) T.D. Penn. from different regions

Cited by 3 publications

References 24 publications

Maturação de frutos e sementes de sapucaia (Lecythis pisonis Cambess. - Lecythidaceae)

Maturação de frutos e sementes de sapucaia (Lecythis pisonis Cambess. - Lecythidaceae)

Active metabolism during desiccation of the desiccation tolerant short-lived seeds of Poincianella pluviosa (DC.) L. P. Queiroz

Atmosphere modification system for respiration analysis of recalcitrant seeds during storage

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