Seed dormancy and germination characteristics of Astragalus arpilobus (Fabaceae, subfamily Papilionoideae), a central Asian desert annual ephemeral

Lei, Yang; Tan, Dunyan; Baskin, Carol C.; Baskin, Jerry M.

doi:10.1016/j.sajb.2012.06.010

Cited by 35 publications

(52 citation statements)

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“…Em algumas espécies que formam banco de sementes, o conteúdo de água é alterado em decorrência de oscilações da umidade do solo, o que pode contribuir para liberação da dormência e, consequentemente, aumento na germinação (Long et al, 2012), porém não há indicação de que as oscilações da umidade do solo e conteúdo de água das sementes influenciem a germinação das sementes (Figuras 1 e 3).…”

Section: Discussionunclassified

“…Uma das possíveis causas que promoveram a longevidade da espécie em estudo foi a presença de tegumento espesso, como evidenciado pela sua dormência tegumentar, o que pode limitar a ação de agentes associados à deterioração, especialmente microoganismos. De acordo com alguns autores, a dormência tegumentar é um dos fatores que contribuem para o aumento da longevidade das sementes (Long et al, 2012(Long et al, , 2015Hanin et al, 2013;Jha et al, 2015).…”

Section: Figuraunclassified

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Comportamento de Sementes de Peltophorum dubium [(Spreng.) Taub.] em Banco de Sementes Induzido

2017

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RESUMOA capacidade que determinadas espécies têm de manter as sementes viáveis por longos períodos no banco de sementes é essencial para a resiliência ambiental, o que é utilizado na restauração florestal. Este trabalho teve como objetivo estudar o comportamento de banco de sementes induzido de P. dubium. A indução do banco de sementes foi feita em fragmento de Floresta Estacional Semidecídual. Foram utilizadas 100 amostras de copos de polietileno, compostas por 25 sementes cada. A cada dois meses, 5 amostras foram retiradas para determinação de: conteúdo de água, viabilidade, porcentagem de emergência de plântulas e porcentagem de predação. As sementes da espécie P. dubium podem permanecer por até 16 meses viáveis enterradas no solo. Esse resultado permite a classificação da espécie como formadora de banco de sementes persistente. A predação de sementes foi o principal fator para que ocorresse a redução do banco de sementes do solo.Palavras-chave: dormência, viabilidade, longevidade. Behavior of Peltophorum dubium ((Spreng.) Taub.) Seeds in a Burial Seed Bank ABSTRACTThe ability of certain species in keeping the seeds viable for long periods in the soil seed bank is essential for environmental resilience, which is used in forest restoration. This work aimed to study the behavior of a buried seed bank of P. dubium. Burial seed bank was performed in a fragment of Seasonal Semideciduous Forest. One hundred samples consisting of 25 seeds in polyethylene cups were placed under the canopy. Every two months, five samples were taken for determination of water content, viability, emergency (root protrusion and seedling formation) and predation. Seeds of P. dubium may remain buried in the ground for up to 16 months keeping their viability. This result indicates that P. dubium is able to form persistent soil seed bank. The predation was the main factor contributing to the seed bank reduction.

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Comportamento de Sementes de Peltophorum dubium [(Spreng.) Taub.] em Banco de Sementes Induzido

2017

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“…Astragalus species, like most temperate legumes, as well as species of as many as 15 different plant families, have hard seed coats and physical dormancy, which often require scarification or stratification to break (Baskin, Baskin & Li, 2000; Long et al, 2012). In particular, low germination rate has been observed for several rare species of Astragalus , including A. nitidiflorus (Vicente et al, 2011), A. bibullatus (Albrecht & Penzagos, 2012), and A. arpilobus (Long et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, low germination rate has been observed for several rare species of Astragalus , including A. nitidiflorus (Vicente et al, 2011), A. bibullatus (Albrecht & Penzagos, 2012), and A. arpilobus (Long et al, 2012). Physical dormancy is generally adaptive; it helps delay seedling emergence until favorable environmental conditions, particularly in habitats with high seasonal or interannual variation (Baskin, Baskin & Li, 2000).…”

Section: Introductionmentioning

confidence: 99%

Germination pretreatments to break hard-seed dormancy in Astragalus cicer L. (Fabaceae)

Statwick

2016

PeerJ

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Conservationists often propagate rare species to improve their long-term population viability. However, seed dormancy can make propagation efforts challenging by substantially lowering seed germination. Here I statistically compare several pretreatment options for seeds of Astragalus cicer L.: unscarified controls and scarification via physical damage, hot water, acid, and hydrogen peroxide. Although only 30% of unscarified seeds germinated, just physical scarification significantly improved germination, whereas one treatment, hot water, resulted in no germination at all. I recommend that rare species of Astragalus, as well as other hard-seeded legumes, be pretreated using physical scarification. Other methods may require considerable optimization, wasting precious time and seeds.

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“…Although fungal attack causes an increase in mortality, its presence is a factor that can positively influence the germination process, since it leads to deterioration of the coating/integument. It was not measured in this experiment, but have already been observed between Alternaria, Aspergillus fungi and Astragalus utahensis seed (Long et al, 2012;Eldredge et al, 2016) and between corn and Fusarium subglutinans (Rheeder et al, 1990).…”

Section: Resultsmentioning

confidence: 78%

Influence of pre-germination treatments on germination seed in Melanoxylon brauna Schott

Freire¹,

Sousa²,

AtaÃde³

et al. 2017

Afr. J. Agric. Res.

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This study evaluated the presence of integument dormancy in Melanoxylon brauna seeds by testing the influence of nine pre-germination treatments on seed germination compared to a control (no pregermination) treatment. Pre-germination treatments include; immersion in sulfuric acid for 5 min, 10 min, 15 min and 30 min, hot water at 80°C without soaking, hot water at 80°C with soaking for 30 min, 90 min, 24 h, and mechanical scarification. The experiment consisted of a completely randomized design, with four replicates and 25 seeds per experimental unit. Percentage germination, germination speed, number of normal and abnormal seedlings, and mortality rate were evaluated. Seeds began to germinate at four days, and germination varied from 33 to 89%, with the highest percentage found in hot water with or without soaking for 30 min, which not differed statistically from control. Immersion in sulfuric acid for longer than 10 min reduced seed germination and increased mortality rate. We conclude that M. brauna seeds do not undergo seed dormancy, and there is no need to apply pregerminating treatments to its seeds.

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Seed dormancy and germination characteristics of Astragalus arpilobus (Fabaceae, subfamily Papilionoideae), a central Asian desert annual ephemeral

Cited by 35 publications

References 24 publications

Comportamento de Sementes de Peltophorum dubium [(Spreng.) Taub.] em Banco de Sementes Induzido

Comportamento de Sementes de Peltophorum dubium [(Spreng.) Taub.] em Banco de Sementes Induzido

Germination pretreatments to break hard-seed dormancy in Astragalus cicer L. (Fabaceae)

Influence of pre-germination treatments on germination seed in Melanoxylon brauna Schott

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