Phylogenetic analysis of Peniocereus (Cactaceae, Echinocereeae) based on five chloroplast DNA markers

Franco-Estrada, Daniel; Sánchez, Daniel; Terrazas, Teresa; Arias, Salvador

doi:10.1007/s40415-021-00774-0

Cited by 2 publications

(1 citation statement)

References 43 publications

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“…tribes Cacteae, Echinocereeae, and Notocacteae). Previous studies predicted this scenario and suggested that the restricted distribution of medullary bundles in Cactoideae is a useful characteristic for the systematics of the family (Mauseth, 1993; Terrazas & Arias, 2002; Terrazas Salgado & Mauseth, 2002; Franco‐Estrada et al ., 2021).…”

Section: Discussionmentioning

confidence: 99%

Medullary bundles in Caryophyllales: form, function, and evolution

Cunha Neto,

Rossetto,

Gerolamo

et al. 2023

New Phytologist

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Summary The occurrence of conducting vascular tissue in the pith (CVTP) of tracheophytes is noteworthy. Medullary bundles, one of the remarkable examples of CVTP, evolved multiple times across angiosperms, notably in the Caryophyllales. Yet, information on the occurrence of medullary bundles is fragmented, hampering our understanding of their structure–function relationships, and evolutionary implications. Using three plastid molecular markers (matK, rbcL, and rps16 intron), a phylogeny is constructed for 561 species of Caryophyllales, and anatomical data are assembled for 856 species across 40 families to investigate the diversity of medullary bundles, their function, evolution, and diversification dynamics. Additionally, correlated evolution between medullary bundles and successive cambia was tested. Medullary bundles are ancestrally absent in Caryophyllales and evolved in core and noncore families. They are structurally diverse (e.g. number, arrangement, and types of bundles) and functionally active throughout the plant's lifespan, providing increased hydraulic conductivity, especially in herbaceous plants. Acquisition of medullary bundles does not explain diversification rate heterogeneity but is correlated to a higher diversification rate. Disparate developmental pathways were found leading to rampant convergent evolution of CVTP in Caryophyllales. These findings indicate the diversification of medullary bundles and vascular tissues as another central theme for functional and comparative molecular studies in Caryophyllales.

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Section: Discussionmentioning

confidence: 99%

Medullary bundles in Caryophyllales: form, function, and evolution

Cunha Neto,

Rossetto,

Gerolamo

et al. 2023

New Phytologist

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Comparative stem anatomy of three species of Coryphantha (Cactoideae-Cactaceae)

2022

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Background: The genus Coryphantha has the second largest number of species of the tribe Cacteae-Cactaceae. Morphologically, it has been reported that the stem presents mainly globose, ovoid and cylindric variations. However, at the anatomical level, descriptions are scarce and focused on particular tissues (epidermis or xylem). The aim of this work is to contribute to the anatomical knowledge of the genus. Questions and/or Hypotheses: What are the anatomical characteristics that differentiate one species from another? Does the presence of crystals allow differentiation between species? Study species: Coryphantha clavata , Coryphantha cornifera and Coryphantha radians . Site and years of study: San Luis Potosí and Querétaro, Mexico; 2017, 2020. Methods: Three individuals per species were collected, and conventional histological techniques were applied. Anatomical descriptions were made for different tissues, and structural characteristics were measured for each species. Results: The species exhibited the greatest differences in the epidermis and hypodermis, such as the presence of subepidermal stomata ( C. radians ), three-layered hypodermis ( C. clavata ), and non-collenchymatous hypodermis ( C. cornifera ). Crystals were not observed in the epidermises but instead in the hypodermes, which exhibited crystal shapes of druses ( C. cornifera and C. radians ), prisms and round bodies ( C. clavata ). In the cortical tissue, C. clavata had abundant mucilage cells. The observed xylem and phloem tissues exhibited characteristics similar to those of other Coryphantha species. Conclusions: The anatomical characteristics of the epidermis and hypodermis are considered of high systematic value and could be used to distinguish between species of the genus.

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Phylogenetic analysis of Peniocereus (Cactaceae, Echinocereeae) based on five chloroplast DNA markers

Cited by 2 publications

References 43 publications

Medullary bundles in Caryophyllales: form, function, and evolution

Medullary bundles in Caryophyllales: form, function, and evolution

Comparative stem anatomy of three species of Coryphantha (Cactoideae-Cactaceae)

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