Role of mucilage in seed dispersal and germination of the annual ephemeral Alyssum minus (Brassicaceae)

Sun, Ying; Tan, Dunyan; Baskin, Carol C.; Baskin, Jerry M.

doi:10.1071/bt11314

Cited by 48 publications

(40 citation statements)

References 30 publications

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“…Some of the important attributes of seed mucilage include its ability to prevent drying of seeds, reduce drought stress during germination, and facilitate rapid germination and early seedling establishment and growth [5,6,11,12]. Seed mucilage also plays important roles in seed dispersal, seed adhesion to soil, and minimizing seed removal by water and predators [6,13]. Although literature is replete with advantages of seed mucilage, especially its role in propagation, inhibiting effects of mucilage have also been recorded for seeds of several species [11,14].…”

Section: Discussionmentioning

confidence: 99%

“…The results in the current study agree with other reports for several other seed-mucilage-bearing species. For example, removing the seed mucilage reportedly favoured the percentage, speed, uniformity of germination, and early development in papaya (Carica papaya [19]), guava (Psidium guajava [20]), citrus [21], red dragon (Hylocereus undatus Haw [22]), passion fruit (Passiflora edulis [23][24][25]), alyssum (Alyssum minus [13]), and lettuce (Lactuca sativa [26]). …”

Section: Discussionmentioning

confidence: 99%

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Demucilaging Freshly Stored Seeds of Cocoa (Theobroma cacao L.) Improves Seedling Emergence and Growth

et al. 2017

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Fresh seeds of cocoa (Theobroma cacao L.) are covered by a large amount of mucilage, which plays important ecological roles. However, for stored seeds, mucilage can adversely affect germination. This study investigated the effect of mucilage removal (demucilaging) and seed storage of freshly extracted cocoa seeds on seedling emergence and growth. The study showed that demucilaging cocoa seeds confers several advantages over mucilage intact seeds provided the seeds have been stored for at least three days before sowing. Demucilaging increased germination rate (T 50 ) and percentage germination and presence of mucilage increased days to seedling emergence and cessation of germination when seeds were stored for over two days. For up to 21 days of seed storage, there was generally no difference in many traits for demucilaged seeds. Demucilaged seeds had 80-100% germination after 21 days of storage, and rate of germination increased with increasing duration of seed storage. Intact mucilage seeds maintained 80-100% germination for only 2 days after seed extraction and rate of germination decreased with increasing seed storage duration. We conclude that (i) if seeds are sown on the day of extraction demucilaging before sowing would be superfluous and (ii) demucilaging and storage can provide advantages to smallholder farmers when environmental or socioeconomic conditions preclude immediate sowing.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Demucilaging Freshly Stored Seeds of Cocoa (Theobroma cacao L.) Improves Seedling Emergence and Growth

et al. 2017

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“…Delayed germination in seeds with reduced mucilage production or where the mucilage had been physically or chemically removed has been observed in other mucilage-producing seeds. The faster germination rate observed in mucilage-producing seeds is usually considered a function of more rapid seed hydration due either to the hydrophilic properties of the mucilage or to the increased surface area in contact with the germination substrate (Sun et al, 2012;Western, 2012). Reducedmucilage-producing mutants in Arabidopsis also showed slower germination than wild-type mucilage-producing seeds (Arsovski et al, 2009).…”

Section: Germination Under Biotic Stressmentioning

confidence: 99%

Stress Influences Seed Germination in Mucilage‐Producing Chia

et al. 2017

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Chia (Salvia hispanica L.) is an oil seed crop, with a high ω‐3 fatty acid and fiber content, used for food and medicine. Upon imbibition, seeds (nutlets) exude a pectinaceous mucilage. The impact of mucilage on seed germination under different environments is unknown. The objectives of this study were to investigate the potential impact of mucilage on chia seeds germinated under conditions of biotic and abiotic stress. Chia seeds were germinated with or without mucilage under various stress conditions in lab and greenhouse studies. Germination conditions included exposure to water, cold, heat, salt stress, and fungal infection. The mucilage was removed following hydration with an acid wash without impacting germination. There was no difference in final germination percentage of seeds with or without mucilage under optimal lab conditions. However, seeds with mucilage removed germinated more slowly, with 63% germination after 26 h compared with 97% in seeds producing mucilage. Seed germination on polyethylene glycol solutions with increasingly negative water potentials was reduced in seeds without mucilage. Seeds with mucilage production that were exposed to cycles of wetting and drying germinated better and faster than non‐mucilage‐containing seeds. Greenhouse emergence showed a similar trend, with mucilage‐producing seeds having greater emergence at lower substrate moisture levels. Under saline conditions, mucilage‐producing seeds germinated 48% higher than non‐mucilage‐producing seeds at 200 mM NaCl. The data suggest that seed mucilage production may impart an ecological advantage in arid or semiarid habitats with irregular soil moisture or soils with high salt levels.

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“…(i) All fruits dehisce at maturity or shortly thereafter, and thus the dispersal and germination units are seeds, e.g. Alyssum dasycarpum, Alyssum desertorum (Liu & Tan 2007), Alyssum minus (Liu & Tan 2007;Sun et al 2012), Arabidopsis pumila, Cithareloma vernum, Erysimum siliculosum, Lepidium apetalum, Lepidium perfoliatum, Malcolmia africana and Malcolmia scorpioides (Liu & Tan 2007). (ii) The pericarp of one segment of the fruit is indehiscent, and it may or may not be dehiscent on the second segment.…”

Section: Introductionmentioning

confidence: 99%

“…Seed germination has been studied in variations one to five in pericarp dehiscence, for example: (i) Alyssum minus (Sun et al 2012); (ii) Cakile spp. (Barbour 1970;Hocking 1982;Maun & Lapierre 1986;Maun & Payne 1989;Zhang 1993), Coincya spp.…”

Section: Introductionmentioning

confidence: 99%

Delayed dehiscence of the pericarp: role in germination and retention of viability of seeds of two cold desert annual Brassicaceae species

Tan

Baskin

et al. 2016

Plant Biol J

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Considerable variation occurs in post-maturity timing of dehiscence in fruits of Brassicaceae species, and several studies have shown that the pericarp plays an important role in seed germination and retention of viability in species with indehiscent fruits. However, little is known about the significance to seed biology of delay in pericarp dehiscence for <1 year in the field. Thus, we determined the role of the pericarps of Leptaleum filifolium and Neotorularia korolkovii, which open in <1 year after fruit maturity and dispersal, in seed germination and retention of seed viability. We compared dormancy-break via after-ripening in the laboratory and germination phenology and retention of seed viability in intact siliques and isolated seeds buried in an experimental garden. Seeds of both species have Type 6 non-deep physiological dormancy, which is enhanced by the pericarp. Seeds of both species after-ripened during summer 2013, and some of them germinated in autumn and some in the following spring in watered and non-watered soil. Germination percentages of seeds in siliques increased in soil in spring 2014, after the pericarps had opened. Most isolated seeds of L. filifolium and N. korolkovii had germinated or were dead by spring 2014 and summer 2015, respectively, whereas 60% of the seeds of both species in the (opened) pericarps were viable after 24 months. Thus, although the pericarp opened 9-10 months after burial, its presence had a significant effect on seed dormancy, germination phenology and retention of viability of seeds of L. filifolium and N. korolkovii.

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Role of mucilage in seed dispersal and germination of the annual ephemeral Alyssum minus (Brassicaceae)

Cited by 48 publications

References 30 publications

Demucilaging Freshly Stored Seeds of Cocoa (Theobroma cacao L.) Improves Seedling Emergence and Growth

Demucilaging Freshly Stored Seeds of Cocoa (Theobroma cacao L.) Improves Seedling Emergence and Growth

Stress Influences Seed Germination in Mucilage‐Producing Chia

Delayed dehiscence of the pericarp: role in germination and retention of viability of seeds of two cold desert annual Brassicaceae species

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