Hidden in the rocks: A new species of Evolvulus L. (Convolvulaceae) revealed by anatomy

Santos, Francisco Diego; Arruda, Emília; Buril, Maria Teresa

doi:10.1007/s12228-020-09615-y

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…Simões (Alencar et al, 2022), Evolvulus L. (Ketjarun et al, 2016;Santos, Arruda, et al, 2020), and Ipomoea L. (Ekeke et al, 2021). Other types of trichomes are also characteristic of Convolvulaceae, such as malpighiaceous trichomes (Santos, Arruda, et al, 2020) and trichomes composed of short peduncular cells (Metcalfe & Chalk, 1950). Buril and Alves (2013) reported that trichomes are an important diagnostic character for Jacquemontia, aiding in the recognition of the genus itself (the presence of stellate trichomes, for example) as well as or as a combination of bifurcated and (rarely) simple trichomes.…”

Section: Discussionmentioning

confidence: 99%

“…Convolvulaceae genera are usually described in the literature as having isobilateral and dorsiventral mesophylls (Metcalfe & Chalk, 1950;Santos, Arruda, et al, 2020) in taxonomic studies, and delimit, for example, Argyreia species (Chitchak et al, 2018). Belo et al (2023) previously observed that the contours of the petioles and the lengths of the vascular bundles in the main midrib and in the petioles Jacquemontia were useful anatomical characters for differentiating J. nodiflora and J. confusa.…”

Section: Discussionmentioning

confidence: 99%

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Leaf and stem micromorphology of Jacquemontia evolvuloides (Moric.) Meisn. (Convolvulaceae) populations: New insights for taxonomic classification using light and scanning electron microscopy

Belo

Buril

Santos

et al. 2023

Microscopy Res & Technique

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Morphoanatomical studies can provide useful and relevant information to support taxonomic groupings. Jacquemontia evolvuloides shows great morphological variability, which has led to numerous taxonomic classifications. To determine if anatomical characters can be used to recognize operational taxonomic units within populations of that species, we analyzed the leaves and stems of 22 populations using light and scanning electron microscopy. The variability of the analyzed characters allowed the grouping of these populations into five morphotypes. The presence of paracytic stomata, laticiferous canals, and stellate trichomes can be considered diagnostic characters of J. evolvuloides. The presence and types of epicuticular waxes, as well as a layer similar to palisade parenchyma in the petioles and stems, the classifications of glandular trichomes, and new types of stomata (anomocytic, anomotetracytic, and brachyparatetracytic) are reported here for the first time for Jacquemontia. The results discussed here help clarify the classification of this species complex and contribute to the taxonomy of Jacquemontia—a genus that has historically been difficult to define due to its wide morphological variation at the species level.Research Highlights Seven types of epicuticular waxes were identified among J. evolvuloides specimens: granules, threads, entire platelets, coiled rodlets, fissured layers, membranous platelets, and tubules. Six types of trichomes were observed among J. evolvuloides populations: stellate, malpighiaceous, sessile peltate glandular, short pedunculate glandular, stipitate‐glandular, and capitate glandular. We observed that six populations of Jacquemontia evolvuloides located in the Brazilian Caatinga domain have unprecedented sessile peltate trichomes restricted to the main leaf midrib, which were only observed under light microscopy.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Leaf and stem micromorphology of Jacquemontia evolvuloides (Moric.) Meisn. (Convolvulaceae) populations: New insights for taxonomic classification using light and scanning electron microscopy

Belo

Buril

Santos

et al. 2023

Microscopy Res & Technique

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“…Convolvulaceae is a diverse family distributed mainly in tropical and warm temperate climates [ 17 ], and secretory structures have been examined in several species within the family. In particular, two internal secretory organs have been reported, laticifers and crystal idioblasts, which possibly contribute to chemical defense and detoxification, respectively [ 18 , 19 , 20 , 21 ], and several other external secretory structures with different forms and functions, found on various plant parts, have also been reported. For example, peltate glands are ubiquitous on the epidermis of vegetative organs, with most reports coming from leaf investigation, and they are believed to contribute to protection from unsuitable environmental conditions and herbivory [ 18 , 20 , 22 , 23 , 24 , 25 , 26 ].…”

Section: Introductionmentioning

confidence: 99%

Functional Ecology of External Secretory Structures in Rivea ornata (Roxb.) Choisy (Convolvulaceae)

Chitchak

Stewart

Traiperm

2022

Plants

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Plants have evolved numerous secretory structures that fulfill diverse roles and shape their interactions with other organisms. Rivea ornata (Roxb.) Choisy (Convolvulaceae) is one species that possesses various external secretory organs hypothesized to be ecologically important. This study, therefore, aimed to investigate five secretory structures (nectary disc, petiolar nectaries, calycinal glands, staminal hairs, and foliar glands) using micromorphology, anatomy, histochemistry, and field observations of plant–animal interactions in order to assess the functional contributions of these structures. Results show that the nectary disc and petiolar nectaries are complex working units consisting of at least epidermis and ground tissue, while the other structures are glandular trichomes. Various groups of metabolites (lipids, phenolic compounds, polysaccharides, terpenoids, flavonoids, and alkaloids) were detected in all structures, while starch grains were only found in the nectary disc, petiolar nectaries, and their adjacent tissues. Integrating preliminary observation of animal visitors with micromorphological, anatomical, and histochemical results, two hypotheses are proposed: (I) nectary disc and staminal hairs are important for pollination as they potentially attract and reward floral visitors, and (II) petiolar nectaries, calycinal glands, and foliar glands contribute to plant defense. Specifically, petiolar nectaries and calycinal glands provide protection from herbivores via guard ants, while calycinal and foliar glands may use plant metabolites to help prevent tissue damage from dehydration and insolation.

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“…Studies assessing the conservation status of Evolvulus species has generally been restricted to the recent publications of new taxa (Silva & Bianchini 2014;Santos et al 2020), taxonomic studies (Silva 2013), and listings in the Red List of Endangered Species (IUCN 2019). The revision of E. sect.…”

Section: Introductionmentioning

confidence: 99%

“…Phyllostachyi (Silva 2013) and the Red List of Threatened Species of the Brazilian Flora (Simão-Bianchini et al 2013) evaluated 16 and five species respectively. Additionally, four newly described species had their conservation status assessed (Silva & Bianchini 2014;Santos et al 2020). In this way, the genus has 21 species (28% of the Brazilian species) evaluated, of which 18 are threatened.…”

Section: Introductionmentioning

confidence: 99%

Nomenclatural, taxonomic, and distribution novelties concerning Evolvulus chrysotrichos (Convolvulaceae): a rare and endangered species from Brazil

Santos

Costa²,

Buril³

2022

Rodriguésia

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Nomenclatural, taxonomic, and distribution novelties concerning Evolvulus chrysotrichos (Convolvulaceae): a rare and endangered species from Brazil. Evolvulus chrysotrichos is a rare and threatened species, known from its type collection and a few old specimens. New records closer to the type locality are reported 150 years after its first collection reported by literature. We present here a complete description of this species, its first illustration and photographs in the field, distribution and phenological data, and a reassessment of its conservation status. We also designate a second-step lectotype of the name E. chrysotrichos and the lectotypification of its synonym, E. guaraniticus.

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Hidden in the rocks: A new species of Evolvulus L. (Convolvulaceae) revealed by anatomy

Cited by 14 publications

References 8 publications

Leaf and stem micromorphology of Jacquemontia evolvuloides (Moric.) Meisn. (Convolvulaceae) populations: New insights for taxonomic classification using light and scanning electron microscopy

Leaf and stem micromorphology of Jacquemontia evolvuloides (Moric.) Meisn. (Convolvulaceae) populations: New insights for taxonomic classification using light and scanning electron microscopy

Functional Ecology of External Secretory Structures in Rivea ornata (Roxb.) Choisy (Convolvulaceae)

Nomenclatural, taxonomic, and distribution novelties concerning Evolvulus chrysotrichos (Convolvulaceae): a rare and endangered species from Brazil

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