Trichomes Related To An Unusual Method Of Water Retention And Protection Of The Stem Apex In An Arid Zone Perennial Species.

dc.creatorLusa, Makeli Garibotti
dc.creatorCardoso, Elaine Cristina
dc.creatorMachado, Silvia Rodrigues
dc.creatorAppezzato-da-Glória, Beatriz
dc.date2014
dc.date2015-11-27T13:43:56Z
dc.date2015-11-27T13:43:56Z
dc.date.accessioned2018-03-29T01:22:51Z
dc.date.available2018-03-29T01:22:51Z
dc.identifierAob Plants. v. 7, 2014.
dc.identifier2041-2851
dc.identifier10.1093/aobpla/plu088
dc.identifierhttp://www.ncbi.nlm.nih.gov/pubmed/25527474
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/201943
dc.identifier25527474
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1302176
dc.descriptionIt is well known that trichomes protect plant organs, and several studies have investigated their role in the adaptation of plants to harsh environments. Recent studies have shown that the production of hydrophilic substances by glandular trichomes and the deposition of this secretion on young organs may facilitate water retention, thus preventing desiccation and favouring organ growth until the plant develops other protective mechanisms. Lychnophora diamantinana is a species endemic to the Brazilian 'campos rupestres' (rocky fields), a region characterized by intense solar radiation and water deficits. This study sought to investigate trichomes and the origin of the substances observed on the stem apices of L. diamantinana. Samples of stem apices, young and expanded leaves were studied using standard techniques, including light microscopy and scanning and transmission electron microscopy. Histochemical tests were used to identify the major groups of metabolites present in the trichomes and the hyaline material deposited on the apices. Non-glandular trichomes and glandular trichomes were observed. The material deposited on the stem apices was hyaline, highly hydrophilic and viscous. This hyaline material primarily consists of carbohydrates that result from the partial degradation of the cell wall of uniseriate trichomes. This degradation occurs at the same time that glandular trichomes secrete terpenoids, phenolic compounds and proteins. These results suggest that the non-glandular trichomes on the leaves of L. diamantinana help protect the young organ, particularly against desiccation, by deposition of highly hydrated substances on the apices. Furthermore, the secretion of glandular trichomes probably repels herbivore and pathogen attacks.
dc.description7
dc.description
dc.languageeng
dc.relationAob Plants
dc.relationAoB Plants
dc.rightsfechado
dc.rightsPublished by Oxford University Press on behalf of the Annals of Botany Company.
dc.sourcePubMed
dc.subjectAsteraceae
dc.subjectCell-wall Degradation
dc.subjectDehydration Protection
dc.subjectGlandular Trichomes
dc.subjectHistochemistry
dc.subjectNon-glandular Trichomes.
dc.titleTrichomes Related To An Unusual Method Of Water Retention And Protection Of The Stem Apex In An Arid Zone Perennial Species.
dc.typeArtículos de revistas


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