Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae)
Abstract Several types of fruit occur in Euphorbiaceae, notably the explosively dehiscent dry fruit, and different seed-coat anatomies with taxonomic importance. This paper aims to describe the pericarp ontogeny and structure in Euphorbia milii Desmoul., and evaluate the presence of the secretory ex...
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| Format: | Article |
| Language: | English |
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Instituto de Pesquisas Jardim Botânico do Rio de Janeiro
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| Series: | Rodriguésia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2175-78602011000300477&lng=en&tlng=en |
| _version_ | 1819050074890567680 |
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| author | Diego Demarco Sandra Maria Carmello-Guerreiro |
| author_facet | Diego Demarco Sandra Maria Carmello-Guerreiro |
| author_sort | Diego Demarco |
| collection | DOAJ |
| description | Abstract Several types of fruit occur in Euphorbiaceae, notably the explosively dehiscent dry fruit, and different seed-coat anatomies with taxonomic importance. This paper aims to describe the pericarp ontogeny and structure in Euphorbia milii Desmoul., and evaluate the presence of the secretory exotesta and caruncle. The fruit is a schizocarp, whose the pericarp development begins with a periclinal division of the inner epidermal cells. The derived cells divide, forming about four layers of obliquely elongated cells. Then, the adjacent parenchyma cells elongate, giving rise to a palisade layer and finally, the cells between this layer and the vascular strands undergo mitosis, originating about four layers of elongated cells perpendicularly to the inner oblique cells. These three zones lignify, while the region between the vascular strands and the exocarp, where idioblasts, hypodermis and laticifers are present do not show significant changes. Before the dehiscence, a lysis of cells of the septa and the desiccation of the fruit occur, which causes contraction of the non-lignified tissues and tension between the lignified zones, promoting rupture of each mericarp from central columella and on the dorsal strand, ejecting the seeds. The seeds have pseudocaruncle and the exotesta secretes mucilage, facilitating their imbibition. |
| first_indexed | 2024-12-21T11:42:16Z |
| format | Article |
| id | doaj.art-7800163812dc4e7ab4e033dc07ec88ab |
| institution | Directory Open Access Journal |
| issn | 2175-7860 |
| language | English |
| last_indexed | 2024-12-21T11:42:16Z |
| publisher | Instituto de Pesquisas Jardim Botânico do Rio de Janeiro |
| record_format | Article |
| series | Rodriguésia |
| spelling | doaj.art-7800163812dc4e7ab4e033dc07ec88ab2022-12-21T19:05:15ZengInstituto de Pesquisas Jardim Botânico do Rio de JaneiroRodriguésia2175-786062347748910.1590/2175-7860201162304S2175-78602011000300477Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae)Diego DemarcoSandra Maria Carmello-GuerreiroAbstract Several types of fruit occur in Euphorbiaceae, notably the explosively dehiscent dry fruit, and different seed-coat anatomies with taxonomic importance. This paper aims to describe the pericarp ontogeny and structure in Euphorbia milii Desmoul., and evaluate the presence of the secretory exotesta and caruncle. The fruit is a schizocarp, whose the pericarp development begins with a periclinal division of the inner epidermal cells. The derived cells divide, forming about four layers of obliquely elongated cells. Then, the adjacent parenchyma cells elongate, giving rise to a palisade layer and finally, the cells between this layer and the vascular strands undergo mitosis, originating about four layers of elongated cells perpendicularly to the inner oblique cells. These three zones lignify, while the region between the vascular strands and the exocarp, where idioblasts, hypodermis and laticifers are present do not show significant changes. Before the dehiscence, a lysis of cells of the septa and the desiccation of the fruit occur, which causes contraction of the non-lignified tissues and tension between the lignified zones, promoting rupture of each mericarp from central columella and on the dorsal strand, ejecting the seeds. The seeds have pseudocaruncle and the exotesta secretes mucilage, facilitating their imbibition.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2175-78602011000300477&lng=en&tlng=enanatomiacoroa-de-cristodesenvolvimentofrutosemente |
| spellingShingle | Diego Demarco Sandra Maria Carmello-Guerreiro Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae) Rodriguésia anatomia coroa-de-cristo desenvolvimento fruto semente |
| title | Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae) |
| title_full | Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae) |
| title_fullStr | Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae) |
| title_full_unstemmed | Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae) |
| title_short | Pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of Euphorbia milii (Euphorbiaceae) |
| title_sort | pericarp ontogeny and histochemistry of the exotesta and pseudocaruncle of euphorbia milii euphorbiaceae |
| topic | anatomia coroa-de-cristo desenvolvimento fruto semente |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2175-78602011000300477&lng=en&tlng=en |
| work_keys_str_mv | AT diegodemarco pericarpontogenyandhistochemistryoftheexotestaandpseudocaruncleofeuphorbiamiliieuphorbiaceae AT sandramariacarmelloguerreiro pericarpontogenyandhistochemistryoftheexotestaandpseudocaruncleofeuphorbiamiliieuphorbiaceae |