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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Expanding the laticifer knowledge in Cannabaceae: distribution, morphology, origin, and latex composition

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Leme, Flavia Maria [1, 2, 3] ; Borella, Pedro Henrique [1] ; Marinho, Cristina Ribeiro [1] ; Teixeira, Simone Padua [1]
Total Authors: 4
[1] Univ Sao Paulo, Fac Ciencias Farmaceut Ribeirao Preto, Dept Ciencias Farmaceut, Ave Cafe S-N, BR-14040903 Ribeirao Preto, SP - Brazil
[2] Univ Estadual Campinas, Inst Biol, Programa Posgrad Biol Vegetal, R Monteiro Lobato 255, BR-13083862 Campinas, SP - Brazil
[3] Univ Fed Mato Grosso do Sul, Inst Biociencias, Lab Bot, Caixa Postal 549, BR-79070900 Campo Grande, MS - Brazil
Total Affiliations: 3
Document type: Journal article
Source: PROTOPLASMA; v. 257, n. 4 MAR 2020.
Web of Science Citations: 0

Cannabaceae is a known family because of the production of cannabinoids in laticifers and glandular trichomes of Cannabis sativa. Laticifers are latex-secreting structures, which in Cannabaceae were identified only in C. sativa and Humulus lupulus. This study aimed to expand the knowledge of laticifers in Cannabaceae by checking their structural type and distribution, and the main classes of substances in the latex of Celtis pubescens, Pteroceltis tatarinowii, and Trema micrantha. Such information is also updated for C. sativa. Samples of shoot apices, stems, leaves, and flowers were processed for anatomical, histochemical, ultrastructural, and cytochemical analyses. Laticifers are articulated unbranched in all species instead of non-articulated as previously described for the family. They occur in all sampled organs. They are thick-walled, multinucleate, with a large vacuole and a peripheral cytoplasm. The cytoplasm is rich in mitochondria, endoplasmic reticulum, dictyosomes, ribosomes, and plastids containing starch grains and oil drops. Pectinase and cellulase activities were detected in the laticifer wall and vacuole, confirming its articulated origin, described by first time in the family. These enzymes promote the complete dissolution of the laticifer terminal walls. The latex contains proteins, lipids, and polysaccharides in addition to phenolics (C. sativa) and terpenes (C. pubescens, T. micrantha). The presence of laticifers with similar distribution and morphology supports the recent insertion of Celtis, Pteroceltis, and Trema in Cannabaceae. The articulated type of laticifer found in Cannabaceae, Moraceae, and Urticaceae indicates that the separation of these families by having distinct laticifer types should be reviewed. (AU)

FAPESP's process: 14/07453-3 - Floral development of urticalean rosids
Grantee:Simone de Pádua Teixeira
Support Opportunities: Regular Research Grants
Grantee:Simone de Pádua Teixeira
Support Opportunities: Regular Research Grants