Secondary‐cell‐wall release: a particular pattern of secretion in the mucilaginous seed coat of <i>Magonia pubescens</i>

Souza, Michely de Jesus; Mercadante-Simões, Maria Olívia; Ribeiro, Leonardo Monteiro

doi:10.1002/ajb2.1415

Cited by 15 publications

(7 citation statements)

References 54 publications

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“…Alkaloids produced by Protium species are considered responsible for deterrent actions against herbivores (Souza et al, 2016), and the phenolic compounds found in P. serratum have antioxidant activities (Tanamatayarat, 2016). The mucilage present in the secretions of species growing in dry environments, such as the Cerrado, also appear to aid in water retention (Silveira et al, 2020; Souza et al, 2020; Costa et al, 2021) and the proteolytic action of the proteins aids in controlling infections (Ramos et al, 2019). Plant secretions such as resins have important protective ecological roles.…”

Section: Discussionmentioning

confidence: 99%

Ontogenesis of Resin Ducts and Secretory Process in Protium spruceanum (Burseraceae) Stems

et al. 2022

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The objective of this work was to characterize the ontogenesis of Protium spruceanum secretory ducts, to evaluate the effects of seasonality on that process, and to characterize the chemical nature of the resin. Morphometric, anatomical, micromorphometric, histochemical, and ultrastructural evaluations of shoot apexes and chemical analyses of the resin were performed. The ducts of schizolysigenous origin are distributed in the primary and secondary phloem. The subsecretory tissue is meristematic and can restore the secretory epithelium. Secretory epithelial cells have wall thickening resembling that of the Casparian strip that regulates secretion reflux. The main resin compounds are pentacyclic triterpenoids, α- and β-amyrins, and α- and β-amyrenones, which are reported here for the first time for this species. The presence of electron-dense and electron-opaque structures, in the secretory epithelial cells, are compatible with the triterpenes and mucilage identified in the resin. Rising temperatures, rainfall, and increasing day length induce the formation of ducts in the vascular cambium throughout Spring/Summer. The abundant production of resin rich in pentacyclic triterpenes indicates the potential use of the species for medicinal and cosmetic purposes. The understanding that secretory processes are concentrated during the Spring/Summer seasons will contribute to the definition of resin extraction management strategies.

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Section: Discussionmentioning

confidence: 99%

Ontogenesis of Resin Ducts and Secretory Process in Protium spruceanum (Burseraceae) Stems

et al. 2022

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“…The production of seed mucilage has a signi cant metabolic cost for the plant. For example, in arabidopsis, mucilage constitutes more than 50% of rhamnose and galacturonic acid in the whole seed [15]. Considering this, as well as the fact that there are hundreds of species in more than 80 families that synthesize seed mucilage [16],…”

Section: Discussionmentioning

confidence: 99%

Optimization of Mucilage Extrusion of Plantago, Asylum, and Basil Seeds by Response Surface Method

Tafaghodinia

2022

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The set of seed coats and other organs that play a role in protecting the embryo and helping to disperse is called the diaspore. The pericarp secretes a gelatinous mixture of cell wall polysaccharides called mucilage in many species. The synthesis, secretion, and modification of the mucilage strain have extensively studied the structure and function of the plant cell wall. However, efforts to understand the best condition for mucilage extrusion have received less attention. In general, mucilage appears to supply the water needed for seed growth, protect the seeds in the intestines of animals when eaten, or affect the ability of the seeds to sink or float in the water and disperse the seeds. However, the main role of this study was to investigate the best condition of holding capacity of mucilage seeds of Plantago, Basil, and Asylum. The effect of polarity, grain number, species, and pH on mucilage extrusion was investigated. Data analysis showed that the number of grains had the least and the type of species had the most impact on the amount of mucilage produced. Overall, the results of the response surface design experiments confirmed the significant effect of pH, polarity, and grain species on the mucilage secretion process. The optimal conditions for the secretion of 10.3 mm of Plantago mucilage, 9.4 mm of Basil mucilage, and 2.9 mm of Asylum mucilage were pH=4 and polarity=15, pH=10 and polarity=15, pH=10 and polarity=15, respectively. Also, the water retention capacity of the mucilage of these seeds was investigated. The results showed that the outer shell of Plantago, Asylum, and Basil seeds have a water retention capacity of 56, 78, and 121 times their weight, respectively.

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“…Some authors have also reported that the presence of seed mucilage delayed germination (e.g. Khajeh-Hosseini & Mostashar-Shahidi, 2016, Souza et al, 2020), further suggesting mucilage mediated antitelechory may be a broader syndrome and seed anchorage is an important component of the particular life history strategy.…”

Section: Discussionmentioning

confidence: 99%

Anchorage by seed mucilage prevents seed dislodgement in high surface flow: a mechanistic investigation

Pan

Girvin

LoPresti

2021

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Seed mucilage is a common and highly diverse trait shared among thousands of angiosperms. While long recognized that mucilage allows seeds to anchor to substrates (antitelechory), we still lack a mechanistic understanding of this process. We propose a mechanistic model of how mucilage affects substrate anchorage and fluid resistance, ultimately contributing to antitelechory. To test this model, we subjected mucilaginous seeds of 52 species, varying in eight measured seed traits, to a week of continuous water flow at a range of erosion potentials. Supporting our model, mucilage mass increased both dry and wet attachment strength, which explained time to erosion well. A standard deviation increase in log mucilage mass increased seed time to dislodgement by 280 times. Fluid resistance was largely dependent on speed of water flow and the seed's modified drag coefficient, but not the quality of the seed or seed mucilage. Neither mucilage expansion speed nor mucilage decay rate explained dislodgement potential well. Our results suggest that the high substrate anchorage strength is the primary role of mucilage in fostering seed establishment in highly erosive environments. In contrast, other seed and mucilage trait differences among species are of lesser importance to antitelechory.

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Secondary‐cell‐wall release: a particular pattern of secretion in the mucilaginous seed coat of Magonia pubescens

Cited by 15 publications

References 54 publications

Ontogenesis of Resin Ducts and Secretory Process in Protium spruceanum (Burseraceae) Stems

Ontogenesis of Resin Ducts and Secretory Process in Protium spruceanum (Burseraceae) Stems

Optimization of Mucilage Extrusion of Plantago, Asylum, and Basil Seeds by Response Surface Method

Anchorage by seed mucilage prevents seed dislodgement in high surface flow: a mechanistic investigation

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