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Abstract Detail



Development and Structure

Silva, Maycon de Sousa [1], Coutinho, Italo Antônio Cotta [2], Rios, Alex Batista Moreira [1], Dalvi, Valdnéa Casagrande [1].

Leaf tooth in Rosa sp. (Rosaceae): a morphoanatomical study of the glands found at the leaflet tooth apex.

Leaf tooth is a term used to refer to the projections that emerge from the leaf margin. The association between leaf tooth and glands is not an unusual feature. In the family Rosaceae, hydathodes have been confirmed at the leaf tooth apex of several species. However, this is not the only type of gland that may be present as colleters and nectaries have been recently described for species of Prunus L. Despite the diversity of secretory structures associated with the leaf teeth in Rosaceae, little attention has been given to leaf margins as barely any morphoanatomical studies have been conducted to document and examine the variations on the tooth morphology as well their association with secretory structures. Therefore, based on standard techniques for both light and scanning electron microscopy, our study offers a morphoanatomical description of the glands present on the leaflet margins of a common rose bush (Rosa sp., subfamily Rosoideae), unravelling the secretory function of such glands by associating morphoanatomy with the chemical nature of the secretion. Leaf tooth were observed in Rosa sp. along the leaflet margins, but they were absent at the basal portion of the leaflets. The apex of the teeth was reddish color, presented prominent vascularization, and an apical glandular structure. The glands started secreting when leaves were developing (e.g., shoot or young leaves) but were absent in adult or senescent leaves as such secretory structure fell off. They presented a central axis containing druses and were covered by a palisade epidermis. Histochemical tests revealed the presence of polysaccharides which accumulated in the periplasmic space and was later released through cuticle rupture.Based on the topography, timing of secretion, morphoanatomical characteristics, and the chemical nature of the secretion leaf tooth in Rosa sp. must be treated as colleters, a secretory structure that plays an ecological role protecting meristems and developing organs against dehydration.


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1 - Instituto Federal de Educação, Ciência e Tecnologia Goiano (IF Goia, Laboratório de Anatomia Vegetal, Rodovia Sul Goiana, Km 01, Zona Rural, Rio Verde, Goiás, 75901-970, Brazil
2 - Universidade Federal Do Ceara, Centro De Ciências - Departamento De Biologia, Av. Mister Hull S/n Campus Do Pici - Bloco 906, Fortaleza, CE, 60440900, Brazil
3 - Instituto Federal de Educação, Ciência e Tecnologia Goiano (IF Goia, Laboratório de Anatomia Vegetal, Rodovia Sul Goiana, Km 01, Zona Rural, Rio Verde, Goiás, 75901-970, Brazil
4 - Instituto Federal de Educação, Ciência e Tecnologia Goiano (IF Goia, Laboratório de Anatomia Vegetal, Rodovia Sul Goiana, Km 01, Zona Rural, Rio Verde, Goiás, 75901-970, Brazil

Keywords:
secretory structure
histochemistry
anatomy
colleter
Plant ecology.

Presentation Type: Oral Paper
Session: DS3, Development and Structure III
Location: /
Date: Thursday, July 22nd, 2021
Time: 2:15 PM(EDT)
Number: DS3017
Abstract ID:577
Candidate for Awards:None


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