Seed coat structure and dormancy

Kelly, Kathleen; Staden, J. Van; Bell, W. E.

doi:10.1007/bf00024559

Cited by 124 publications

(83 citation statements)

References 51 publications

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“…in fact, as discussed by Souza and Marcos-Filho (2001), the morphological features of the Fabaceae seed coat are relatively insensitive to environmental conditions and contain distinct taxonomic features. Both species showed seed morphological and anatomical features for seed coats of the subfamily Faboideae, as previously described by Corner (1976), Kelly, Van Staden, and Bell (1992) and Kirkbride, Gunn and Weitzman (2003), such as the lens close to the hilum, the hilum completely visible, and a funicular remnant (rim aril) that is split down the middle lengthwise. in S. tomentosa the micropyle is covered by the hilum as observed by Hu et al (2008) in S. alopecuroides.…”

Section: Discussionsupporting

confidence: 75%

Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)

Delgado

Paula²,

Santos³

et al. 2014

RBT

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Dormancy-breaking requirements of Sophora tomentosa and Erythrina speciosa (Fabaceae) seeds. The physical dormancy of seeds has been poorly studied in species from tropical forests, such as the Atlantic Forest. This study aimed to examine the effect of moderate alternating temperatures on breaking the physical dormancy of seeds, the morphoanatomy and histochemistry of seed coats, and to locate the structure/ region responsible for water entrance into the seed, after breaking the physical dormancy of seeds of two woody Fabaceae (subfamily Faboideae) species that occur in the Brazilian Atlantic Forest: Sophora tomentosa and Erythrina speciosa. To assess temperature effect, seeds were incubated in several temperature values that occur in the Atlantic Forest. For morphological and histochemical studies, sections of fixed seeds were subjected to different reagents, and were observed using light or epifluorescence microscopy, to analyze the anatomy and histochemistry of the seed coat. Treated and non-treated seeds were also analyzed using a scanning electron microscope (SEM) to observe the morphology of the seed coat. To localize the specific site of water entrance, the seeds were blocked with glue in different regions and also immersed in ink. in the present work a maximum temperature fluctuation of 15ºC was applied during a period of 20 days and these conditions did not increase the germination of S. tomentosa or E. speciosa. These results may indicate that these seeds require larger fluctuation of temperature than the applied or/and longer period of exposition to the temperature fluctuation. Blocking experiments water inlet combined with SEM analysis of the structures of seed coat for both species showed that besides the lens, the hilum and micropyle are involved in water absorption in seeds scarified with hot water. in seeds of E. speciosa the immersion of scarified seeds into an aniline aqueous solution showed that the solution first entered the seed through the hilum. Both species showed seed morphological and anatomical features for seed coats of the subfamily Faboideae. Lignin and callose were found around all palisade layers and the water impermeability and ecological role of these substances are discussed in the work. Rev. Biol. Trop. 63 (1): 285-294. Epub 2015 March 01.

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Section: Discussionsupporting

confidence: 75%

Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)

Delgado

Paula²,

Santos³

et al. 2014

RBT

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“…Hard seed coat acts as a barrier for the imbibition of water and exchange of gases, essential for initiation of the germination process. Hard seed coats together with pericarps and other structural barriers impose a high mechanical resistance and block water uptake and/or oxygen diffusion (Kelly, 1992). Cold stratification has been widely used as a pre-sowing treatment for breaking dormancy to enhancing the seed germination rate (ISTA, 1976;Baskin and Baskin, 2004).…”

Section: Introductionmentioning

confidence: 99%

Effect of Different Pre-Sowing Treatments on Seed Germination of Spruce (Picea smithiana Wall. Boiss) Seeds under Temperate Conditions of Kashmir Himalayas, India

Mugloo¹,

Mir²,

Khan³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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“…This succession can also occur when seeds pass through an animal digestive system by the action of the gastric acids (Goddard et al, 2009). Under natural conditions, release of dormancy imposed by the seed coat requires the interaction of a number of biological and physiological dormancy-breaking procedures (Kelly et al, 1992).…”

Section: Introductionmentioning

confidence: 99%

SEED DORMANCY BREAKING TREATMENTS FORAFRICAN PURSLANE (Zaleya pentandra)

et al. 2015

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-Understanding the mechanisms involved in releasing seed dormancy is crucial for effective plant management and renewal of species in the arid zone. Zaleya pentandra is an emerging invasive weed of the arid areas of Pakistan. We investigated the effects of different dormancy breaking treatments on the germination of Z. pentandra seeds. Seeds were treated with hot water (by placing them in boiling water for 5, 15, 30, 60, 90, 120, and 150 min), dry heat (by placing them in a preheated oven at 70 o C for 1, 2, and 4 hours; at 70 o C for 1, 2, 3, and 4 days, and at 200 o C for 5, 10, 15, 30, and 45 min) and stratification (by placing them at 2-5 ºC in a refrigerator for 5, 10, 30, and 60 min; for 3, 6, and 12 hours, and for 1, 2, 4, 8, 15, and 30 days). Seeds also were soaked in thiourea ([(NH 2 ) 2 CS] (0, 2,500, 5,000, 7,500, and 10,000 mg L -1 for 24 h at 30 o C) and in KNO 3 (0, 10,000, 20,000, 30,000, 40,000, 50,000, and 60,000 mg L -1 for 24 h at 30 o C). Additionally, seeds were scarified with HCl (for 3, 6, 9, 12, 15, 18, and 21 h), HNO 3 (for 3, 6, 9, 12, 15, 18, and 21 h), and H 2 SO 4 (for 20, 40, 60, 80, 100, and 120 min at 30 o C) and also mechanically scarified with sandpaper. Zaleya pentandra seeds showed typical signs of hard seed coat dormancy. Mechanical scarification and acid treatments promoted seed germination to a varying degree. Seed scarification with HNO 3 for 12 to 18 h as well as with HCl for 12 h and 15 h was efficient in breaking dormancy of Z. pentandra seeds, providing germination up to 92.5%. Seed scarification with H 2 SO 4 from 20 to 120 min showed little effect, whereas hot water, dry heat, stratification and various concentrations of thiourea and KNO 3 were ineffective in breaking Z. pentandra seed dormancy.Keywords: germination, scarification, stratification, dry heat, thiourea, arid zone. 5, 15, 30, 60, 90, 120 (0, 10.000, 20.000, 30.000, 40.000, 50.000, and 60.000 mg L -1 por 24 ha 3 0 o C). Além disso, as sementes foram escarificadas com HCl (por 3, 6, 9, 12, 15, 18, e 21 h), HNO 3 (por 3, 6, 9, 12, 15, 18, e 21 h), e H 2 SO 4 (por 20, 40, 60, 80, 100 RESUMO -Conhecer os mecanismos envolvidos na liberação da dormência de sementes é fundamental para o manejo da planta e recuperação de espécies na zona árida. A Zaleya pentandra é uma erva invasora emergente das áreas áridas do Paquistão. Neste estudo, os efeitos dos diferentes tratamentos da quebra de dormência foram investigados acerca da germinação de sementes de Z. pentandra. As sementes foram tratadas com água quente (colocadas em água fervendo por

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Seed coat structure and dormancy

Cited by 124 publications

References 51 publications

Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)

Water absorption and dormancy-breaking requirements of physically dormant seeds of Sophora tomentosa L. and Erythrina speciosa Andr. (Fabaceae-Faboideae)

Effect of Different Pre-Sowing Treatments on Seed Germination of Spruce (Picea smithiana Wall. Boiss) Seeds under Temperate Conditions of Kashmir Himalayas, India

SEED DORMANCY BREAKING TREATMENTS FORAFRICAN PURSLANE (Zaleya pentandra)

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