Origin of the subepidermal tissue in Piper L. leaves

Abstract

Studies on the anatomy of Piper leaves demonstrate the presence of a subepidermal tissue distinct from the adjacent epidermis, which cells show thin walls and hyaline contents. Some authors consider such cells a hypodermal tissue, while others refer to them as components of a multiple epidermis. In this study, the nature of this subepidermal tissue was investigated through the analysis of leaf ontogeny in three Piper species. The analysis showed that the referred tissue originates from the ground meristem and, thus, should be considered a hypodermis. The studied species suggests that the role of the hypodermis would be to protect the photosynthetic apparatus from excess light, regulating the intensity of light reaching the chlorophyll parenchyma.Keywords: hypodermis, multisseriate epidermis, Piperaceae. Origem do tecido subepidérmico em folhas de Piper L. ResumoOs estudos de anatomia foliar de espécies de Piper revelam a presença de um tecido subepidérmico distinto da epiderme e cujas células apresentam paredes finas e conteúdo hialino. Estas células são referenciadas por alguns autores como um tecido hipodérmico e por outros, como sendo constituintes de uma epiderme múltipla. Nesse estudo verificou-se a natureza deste tecido subepidérmico a partir da análise da ontogênese foliar de três espécies de Piper. A análise revelou que o referido tecido tem origem do meristema fundamental e, portanto, deve ser denominado de hipoderme. Para as espécies avaliadas, sugere-se que a hipoderme teria função de, proteger o aparato fotossintético do excesso de luminosidade, regulando a intensidade luminosa que atinge o parênquima clorofiliano.Palavras-chave: hipoderme, epiderme multisseriada, Piperaceae.

Morphoanatomical profile of five species of Piper L. from Bangladesh and its taxonomic significance

“…3G-I). Such idioblasts have additional secretory functions and reported from many other species of Piper (Raman et al, 2012;Machado et al, 2015;Nakamura et al, 2015;Santos et al, 2015;Bertocco et al, 2017).…”

“…In case of laminar portion, immediately beneath the upper and lower epidermis distinct hypodermal layers of hyaline parencyhmatous cells are notified. Nakamura et al (2015) opines that the origin of the sub-epidermal layers or hypodermis in Piper leaves is the ground meristem. The number of hypodermal layers is considered by many authors as a taxonomic character to identify Piper species (Raman et al, 2012;Machado et al, 2015;Santos et al, 2015;Bertocco et al, 2017).…”

Estudio anatómico e histoquímico de los órganos vegetativos de Piper aduncum L. (Piperaceae)

“…Estas capas sub-epidérmicas han sido descritas tempranamente como una hipodermis para las especies del género Piper (Metcalfe & Chalk, 1957) y su naturaleza uni o biestratificada es registrada por diversos autores que han tratado la anatomía foliar de las especies del género (Nascimento & Vilhena-Potiguara, 1999;Albiero, Paoli, et al, 2005;Albiero, de Souza, et al, 2005;Albiero et al, 2006;Bertocco et al, 2017). En base a un estudio anatómico de ontogenia foliar de especies de Piper, incluyendo P. aduncum, Nakamura et al (2015) proponen la denominación de hipodermis. A diferencia de nuestro reporte, Dousseau et al (Dousseau et al, 2014) describe para P. aduncum una capa sub-epidérmica (hipodermis) uniestratificada.…”

“…A diferencia de nuestro reporte, Dousseau et al (Dousseau et al, 2014) describe para P. aduncum una capa sub-epidérmica (hipodermis) uniestratificada. Esta capa su-epidérmica es considerada variable en su desarrollo debido a la influencia que ejerce el medio ambiente (Duarte & Siebenrock, 2010;dos Santos et al, 2015dos Santos et al, , 2018 y también le atribuyen un carácter diagnóstico para las especies de Piper (Nakamura et al, 2015).…”

Idioblasts formation and essential oil production in irrigated Piper aduncum

“…The essential oil production is related to the presence of secretory structures, such as idioblasts and secretory trichomes (Silva & Machado 1999, Marinho et al 2011, Tozin et al 2015. Idioblasts are present in all parts of P. aduncum plants, mostly in the leaves (Lakshmia & Naidu 2010, Marinho et al 2011, Gogosz et al 2012, Nakamura et al 2015, Santos et al 2018, which are the source for the highest amounts of essential oil. These secondary metabolism compounds are targeted by the chemical industry and present multiple biological effects exploited as insecticides, fungicides, molluscicides, acaricides, bactericides and larvicides, with the advantage of being biodegradable products (Zacaroni et al 2009, Costa et al 2010, Pino et al 2011, Piton et al 2014, Rapado et al 2014, Santos & Siviero 2015, Pinto et al 2016.…”