Maturation and Desiccation Tolerance in Seeds of Sesbania virgata (Cav.) Pers.

Teixeira, Fabrício Palla; Faria, José Márcio Rocha; Pereira, Wilson Vicente Souza; José, Anderson Cleiton

doi:10.1590/2179-8087.041916

Cited by 5 publications

(4 citation statements)

References 24 publications

(37 reference statements)

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“…Seed longevity is dependent on postharvest moisture and temperature conditions, but also on "seed quality", which includes physiological traits influenced by collection timing (Walters, 1998;Walters et al, 2010). Acquisition of desiccation tolerance relies on accumulation of sugars and late embryogenesis abundant (LEA) proteins, which facilitate glass formation, and occurs in later stages of seed development (Leprince and Buitink, 2010;Long et al, 2015;Teixeira et al, 2018). When fruit collections are made before the point of natural abscission, seeds may not have developed the desiccation tolerance of mature seeds, which in turn decreases storage longevity (Leprince et al, 1993(Leprince et al, , 2017Hay and Probert, 1995;Angelovici et al, 2010).…”

Section: Short-lived or Recalcitrant Species With Rci <1 Yr-mentioning

confidence: 99%

Seed freeze sensitivity and ex situ longevity of 295 species in the native Hawaiian flora

Chau

Chambers²,

Weisenberger

et al. 2019

American J of Botany

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Conservation of plant biodiversity requires in situ protection of native habitat and ex situ conservation methods to secure collections of propagules for restoration and reintroduction. Integrating both in situ and ex situ strategies is essential in Hawai'i, where over half the native flora is at risk of endangerment or extinction due to threats such as alien invasive species, habitat modification, climate change, and other human impacts (Sakai et al., 2002; Fortini et al., 2013; Weisenberger and Keir, 2014b; IUCN [International Union for the Conservation of Nature], 2018). The recent commencement of widespread in situ recovery efforts across the state has not yet stemmed rapid decline within remaining populations of many endemic species (IUCN, 2018). In fact, the number of federally listed Threatened and Endangered (T&E) plants in Hawai'i has increased by 56% over the last decade (USFWS, 2018). Accordingly, maintaining viable propagules as an ex situ "genetic safety net" until appropriate habitat can be protected is often the only way to prevent further extinctions (Havens et al., 2004). Restoration outplantings are often experimental, testing site suitability and mixing source material to determine which combinations are most effective (Guerrant and Kaye, 2007). One limiting factor biodiversity managers need to overcome to successfully restore habitats and populations is obtaining enough propagules to maximize genetic diversity. Thus, managers are increasingly dependent on ex situ germplasm storage to accumulate collections from small fragmented subpopulations, so that plant material collected from maternal founders over multiple seasons can be recombined

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Section: Short-lived or Recalcitrant Species With Rci <1 Yr-mentioning

confidence: 99%

Seed freeze sensitivity and ex situ longevity of 295 species in the native Hawaiian flora

Chau

Chambers²,

Weisenberger

et al. 2019

American J of Botany

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“…Pers. (TEIXEIRA et al, 2018). Segundo Lazarotto et al (2011), o maior teor de água das sementes no início do processo de maturação também se deve ao alongamento e divisão celular, promovido pelo potencial de pressão, sendo esse o ponto de maior concentração de massa seca.…”

Section: Resultsunclassified

Momento de colheita de sementes de <i>Albizia hasslerii</i> (Chod.) Burkart em função da cor do fruto

et al. 2020

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O objetivo deste estudo foi identificar a cor do fruto de Albizia hasslerii que corresponde a sementes com maior potencial fisiológico. Os frutos foram colhidos em diferentes estádios de maturação para a realização das análises, sendo classificados visualmente em quatro cores: 100% verde (estádio 1), ≤ 50% marrom (estádio 2), entre 50% e 99,9% marrom (estádio 3) e 100% marrom (estádio 4). Posteriormente, procedeu-se a mensuração dos atributos biométricos das sementes, e simultaneamente, Risssos testes de germinação e vigor foram instalados. Para verificar a relação da maturação de frutos com a biometria e o potencial fisiológico de sementes, determinou-se o coeficiente de correlação de Spearman (ρ). O delineamento utilizado foi inteiramente casualizado, sendo os resultados submetidos à análise de variância, e as médias comparadas pelo teste de Tukey, a 5% de probabilidade. As sementes provenientes dos frutos que se encontravam nos estádios 3 e 4, manifestaram maior germinação e emergência, menores médias de teor de água e maior matéria seca, sendo esses indicadores do melhor momento de colheita de frutos. Já as sementes obtidas de frutos verdes apresentaram baixa germinação e vigor, alto teor de água e menor matéria seca. Conclui-se que as sementes com alto potencial fisiológico estão em frutos com cor 100% marrom, porém a partir de 50% de cor marrom já podem ser colhidos. Portanto, a cor dos frutos é considerada um indicador de maturidade fisiológica para a espécie Albizia hasslerii.

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“…parahyba, while in this study, a mesotesta with thick cell walls and no intercellular space below a multi-layered hypodermis of osteosclereids could be observed. This is unusual, as several studies describe the hypodermis in the seed coat of Fabaceae as a single layer of osteosclereids (for example, Costa et al, 2011;Rodrigues-Junior, et al, 2014;Robles-Díaz et al, 2016;Geisler et al, 2017;Jaganathan et al, 2017;Teixeira et al, 2018). In this way, the multi-layered hypodermis of osteosclereids seems to be a useful characteristic to distinguish the S. parahyba var.…”

Section: /9mentioning

confidence: 99%

Moist Heat Overcomes Physical Dormancy at the Seed Coat Lens in Schizolobium parahyba var. amazonicum

Smychniuk¹,

Calvi

Ferraz

2020

Floresta Ambient.

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Schizolobium parahyba var. amazonicum (Huber ex Ducke) Barneby (Fabaceae-Caesalpinoideae) is a tree of the Amazon region with pioneer characteristics and large seeds with physical dormancy. Using Accelerated Ageing (AA) methodology, seeds were exposed to Moist Heat (40 °C; >97% Relative Humidity; RH) or Dry Heat (40 °C; 22% RH). Furthermore, it was also investigated dormancy release and the primary site of water entrance into the seeds. Seeds tolerate these conditions for up to six days without any reduction in vigour, however, only Moist Heat could overcome seed dormancy, allowing germination. The lens is the water-gap for primary water entry (where the palisade layer is thinner), as seeds with blocked lens did not imbibe. An unusual multi-layered hypodermis of osteosclereids in the seed coat was observed. Our results suggest that the combination of high temperature with high RH is a key factor involved in overcoming dormancy in the natural habitat of this Amazonian species.

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Maturation and Desiccation Tolerance in Seeds of Sesbania virgata (Cav.) Pers.

Cited by 5 publications

References 24 publications

Seed freeze sensitivity and ex situ longevity of 295 species in the native Hawaiian flora

Seed freeze sensitivity and ex situ longevity of 295 species in the native Hawaiian flora

Momento de colheita de sementes de <i>Albizia hasslerii</i> (Chod.) Burkart em função da cor do fruto

Moist Heat Overcomes Physical Dormancy at the Seed Coat Lens in Schizolobium parahyba var. amazonicum

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