Note Sur La Structure Et Le Développement Du Tégument Séminal Chez Les Crucifères

Guignard, Marc

doi:10.1080/00378941.1892.10828687

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Seed development of B. napus (canola) is a complex yet elegant chapter of the plant lifecycle that starts with the unfertilized ovule (OV) and ends with formation of the dry seed (DS; Figure 1a). The first phase of seed development results from a double fertilization event that leads to the establishment of the embryo and the endosperm surrounded and protected by the maternally derived seed coat (Dresselhaus & Franklin‐Tong, 2013; Guignard, 1902). Early in the morphogenesis phase, the globular (GLOB) embryo begins to differentiate through programmed cell divisions and establish tissue identities (Smith & Long, 2010; Tykarska, 1976).…”

Section: Introductionmentioning

confidence: 99%

Genomic asymmetry of the Brassica napus seed: epigenetic contributions of DNA methylation and small RNAs to subgenome bias

et al. 2023

View full text Add to dashboard Cite

Polyploidy is a persistent phenomenon in angiosperm genome evolution that is hypothesized to have contributed to the diversity of extant flowering plants. Brassica napus, one of the world's most important angiosperm oilseed species, originated from the interspecific hybridization of Brassica rapa (A n ) and Brassica oleracea (C n ). While the trends of genome dominance in transcriptomics are beginning to emerge, less is known about the epigenetic and small RNA landscapes in polyploids during reproductive development. The seed is the pivotal developmental transition into the new sporophytic generation, and experiences substantial epigenetic modifications over time. Here, we investigated the prevalence of bias in the contexts of DNA methylation and small interfering (si)RNA profiles in both subgenomes (A n and C n ), as well as the ancestral fractionated genomes across B. napus seed development. We report ubiquitous C n subgenome bias of siRNA expression and cytosine methylation, with DNA methylation being particularly abundant on gene promoters in the C n subgenome. Further, we provide evidence that siRNA transcriptional patterns were conserved within the ancestral triplicated subgenomes of B. napus, but not across the A n and C n subgenomes. We discuss how methylation patterns in the B. napus seed relate to genes, promoter regions, siRNA loci and transposable elements through the lens of genome fractionation and polyploidization. Taken together we provide evidence for epigenetic regulation selectively silencing the C n subgenome during seed development, and explore the impact of genome fractionation on the epigenetic components of the B. napus seed.

show abstract

Section: Introductionmentioning

confidence: 99%

Genomic asymmetry of the Brassica napus seed: epigenetic contributions of DNA methylation and small RNAs to subgenome bias

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The relatively few workers who not only examined the structural features of the mature testa but also studied the development of the ovule into a seed (such as Guignard, 1890Guignard, , 1892Guignard, , 1893Oliva, 1905; van Wisselingh, 1919;Klykken, 1937) found that the layers a, b and c are derived from the outer, middle and inner cell-layers respectively of the outer integument, whereas layer d is a derivative of the inner integument. Against the inner cell-layer of the testa lies the secondary endosperm differentiated into an outermost aleuron layer (assise prote'ique, Kleberschicht), one cell thick, and the hyaline Iayer (Nuhrschicht) consisting of all remaining, compressed endosperm cells.…”

Section: Introductionmentioning

confidence: 99%

Integument initiation and testa development in some Cruciferae

Bouman

1975

Botanical Journal of the Linnean Society

View full text Add to dashboard Cite

This study has shown for the first time that the middle layer (or layers) of the outer integument is (are) of subdermal derivation in at least some taxa of the Cruciferae. The outer integument is initiated in the Cruciferae in three different ways, viz. subdermally (Brassica, Sinapis), partly subdermally and partly dermally (Lunaria), or completely dermally (Capsella). These differences in initiation are reflected in the structure of the mature testa. The inner integument is completely of dermal derivation and originally two cell‐layers thick, but may become more than two‐layered during the ovule and seed maturation by periclinal divisions of the inner cell layer. The consequences of the ontogeny of the integuments for the terminology and interpretation of the mature testa is discussed.

show abstract

“…La coupe d'une graine (fig. 45-47) montre, accolée au tégument séminal et tapissant entièrement la cavité centrale (que ne remplit pas l'embryon, du moins sur les coupes), une couche de grosses cellules à contenu dense; il s'agit de l'« assise protéique » (Guignard, 1893;Abrial, 1910), qui représente un vestige d'albumen cellulaire. La graine mûre de Sphenoclea n'est donc pas stricto sensu, exalbuminée.…”

Section: La Fleur Le Fruit Et La Graine De Sphenocleaunclassified

A propos du Sphenoclea zeylanica (Sphenocleaceæ)

Monod

1980

Adansonia

View full text Add to dashboard Cite

Note Sur La Structure Et Le Développement Du Tégument Séminal Chez Les Crucifères

Cited by 4 publications

References 0 publications

Genomic asymmetry of the Brassica napus seed: epigenetic contributions of DNA methylation and small RNAs to subgenome bias

Genomic asymmetry of the Brassica napus seed: epigenetic contributions of DNA methylation and small RNAs to subgenome bias

Integument initiation and testa development in some Cruciferae

A propos du Sphenoclea zeylanica (Sphenocleaceæ)

Contact Info

Product

Resources

About