Leaf morphology and anatomy of<i>Camellia</i>section<i>Camellia</i>(Theaceae)

Erxu, Pi; Peng, Qiu-Fa; Lü, Hongfei; Jingbo, Shen; Du, Yanxiu; Feilai, Huang; Hui, Hu

doi:10.1111/j.1095-8339.2009.00952.x

Cited by 29 publications

(8 citation statements)

References 18 publications

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“…Th ese structures are made of projections of the fundamental tissue of the vein, which form cavities or fi ssures with trichomes, and have already been described for the genus (Da Cunha & Vieira 1993/97; Quinteiro et al 2006). Epidermal characters have been used in studies on the relationship of taxa (e.g., Ayodele & Olowokudejo 2006;Erxu et al 2009). Some characteristics of the epidermis are infl uenced by environmental conditions, such as the outline of the anticlinal wall and the shape of the external periclinal wall of the epidermal cells.…”

Section: Discussionmentioning

confidence: 99%

Comparative leaf anatomy and micromorphology of Psychotria species (Rubiaceae) from the Atlantic Rainforest

et al. 2011

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RESUMO(Anatomia e micromorfologia comparada da folha de espécies de Psychotria (Rubiaceae) da Floresta Atlân-tica). O gênero Psychotria compreende aproximadamente 2000 espécies, a maioria arbórea distribuídas em florestas tropicais e subtropicais. Dentro de Rubiaceae, o gênero é bem conhecido pelas espécies produtoras de alcalóides bioativos e taxonomia complexa. Os caracteres anatômicos e micromorfológicos de P. hoffmannseggiana, P. carthagenensis, P. deflexa, P. glaziovii, P. leiocarpa, P. racemosa e P. vellosiana foram investigados e descritos. A variação interespecífica foi avaliada, a fim de contribuir para a sistemática do gêwnero. A análise dos componentes principais (PCA) e a análise de agrupamento através das médias não ponderadas de grupos pareados (UPGMA) indicaram quatro grupos baseados na presença e ausência de algumas características estudadas. Mesofilo dorsiventral, folhas hipostomáticas, estômatos paracíticos, organização do sistema vascular do pecíolo e da nervura principal em arco e presença de feixes acessórios são comuns nas espécies examinadas e são características típicas de Rubiaceae. A presença de cristais estilóides e de alcalóides é considerada característica diagnóstica destas espécies de Psychotria. Outras características usadas para a distinção das espécies o gênero são: o contorno do pecíolo, a ornamentação da cutícula e a presença de tricomas. ABSTRACT(Comparative leaf anatomy and micromorphology of Psychotria species (Rubiaceae) from the Atlantic Rainforest). Th e genus Psychotria comprises approximately 2,000 species that are mostly shrubs distributed in forests of the tropics and subtropics. Within the Rubiaceae, Psychotria is well known for its species that produce bioactive alkaloids and for its taxonomic complexity. Th e anatomical and micromorphological characters of the leaves of P. hoff mannseggiana, P. carthagenensis, P. defl exa, P. glaziovii, P. leiocarpa, P. racemosa, and P. vellosiana were investigated and described to understand the interspecifi c variation of these species, which will contribute to the systematics of the genus. Principal component analysis (PCA) and unweighted pair group method analysis (UPGMA) indicated four groups based on the presence or absence of some of the characters studied. Dorsiventral mesophyll, hypostomatic leaves, paracytic stomata, organization of the vascular system of the petiole and midrib in an arc and the presence of accessory bundles are common in the species examined and are typical characteristics of the Rubiaceae. Th e presence of styloid crystals and alkaloids are considered diagnostic characters of Psychotria. Other characteristics used to separate species in the genus are the petiole contour, cuticle ornamentation, and presence of trichomes. Th e results of the UPGMA cluster analyses indicated that there is similarity between Psychotria (subg. Heteropsychotria) and Palicourea species.

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Section: Discussionmentioning

confidence: 99%

Comparative leaf anatomy and micromorphology of Psychotria species (Rubiaceae) from the Atlantic Rainforest

et al. 2011

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“…However, the contents of these secondary metabolites vary greatly among different varieties and Camellia species, leading to large differences in tea processing suitability 1,185 . They also differ significantly in several morphological traits (e.g., leaf size) and stress resistance characteristics (e.g., cold tolerance), showing a divergent genetic makeup 50,186 . Therefore, the genome sequence of a single individual of a tea plant variety (e.g., shuchazao or yunkang #10) cannot represent the entire gene pool of tea plants.…”

Section: Future Challenges and Perspectivesmentioning

confidence: 99%

Tea plant genomics: achievements, challenges and perspectives

et al. 2020

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Tea is among the world’s most widely consumed non-alcoholic beverages and possesses enormous economic, health, and cultural values. It is produced from the cured leaves of tea plants, which are important evergreen crops globally cultivated in over 50 countries. Along with recent innovations and advances in biotechnologies, great progress in tea plant genomics and genetics has been achieved, which has facilitated our understanding of the molecular mechanisms of tea quality and the evolution of the tea plant genome. In this review, we briefly summarize the achievements of the past two decades, which primarily include diverse genome and transcriptome sequencing projects, gene discovery and regulation studies, investigation of the epigenetics and noncoding RNAs, origin and domestication, phylogenetics and germplasm utilization of tea plant as well as newly developed tools/platforms. We also present perspectives and possible challenges for future functional genomic studies that will contribute to the acceleration of breeding programs in tea plants.

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“…Stomatal clusters in the genus Camellia are generally with 2-4 stomata and arranged adjacent to subsidiary cells (Ao et al 2007;Erxu et al 2009). Stomata clusters were observed in many Camellia species such as C. jinshajiangica, C. omeiensis, C. polyodonta, C. lanosituba, C. longigyna, C. lapidea, C. phelloderma, C. oligophlebia, C. uraku, C. edithae, C. paucipetala, C. henryana, C. tsingpienensis, etc (Ao et al 2007;Erxu et al 2009). While many species without stomata clusters have also been recorded, such as C. xifongensis, C. hongkongensis, C. brachygyna, C. hibisciflora, C. concina, C. glabsipetala, C. villosa, etc (Erxu et al 2009).…”

Section: Epidermal Cells and Stomatal Apparatusmentioning

confidence: 99%

“…However, these Camellia species are difficult to distinguish based on only macro-morphological characters, because of variations in the size and shape of leaves, as well as the size and shape of reproductive parts even in an infrageneric population or a single individual (Zhao 2019), which leads to misidentifications. Erxu et al (2009) suggested that morphological and anatomical characters, especially the leaf part played an essential role in taxonomy and accurate species identification when there was not much information for flower variation or some species flower infrequently. A study on surveying and comparing the leaf epidermis characteristics of some Camellia species was reported by Ao et al (2007), but this does not generalize to new species continuously being recorded.…”

Section: Introductionmentioning

confidence: 99%

Morphological, physicochemical, and phytochemical characterization of Camellia dormoyana (Pierre) Sealy from Vietnam

LUAN

Chen²,

Nguyen³

et al. 2022

Biodiversitas

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Abstract. Luan DT, Chen TV, Nguyen DD, Truong QC, Thang KH, Nhi NTT, Giang VNL, Sang NX, Triet NT. 2022. Morphological, physicochemical, and phytochemical characterization of Camellia dormoyana (Pierre) Sealy from Vietnam. Biodiversitas 23: 5869-5883. Camellia dormoyana (Pierre) Sealy has been used as a flavor, beverage, and folk medicine. Micromorphological features, physicochemical, and phytochemical aspects of C. Dormoyana have not been reported. Thus, further research is necessary to accurately verify the plants and determine their quality and safety for raw materials. This study aimed to characterize morphological, physicochemical, and phytochemical aspects of C. dormoyana from Vietnam. The results present that the species is easily distinguished macromorphologically by the superior ovary, 5-or 6-carpellate, glabrous, and styles glabrous, 5-or 6-parted, and uniformly fused. Micromorphologically, the structure of leaves and stems have similarities between the investigated species in the genus Camellia. Cork-wart, anisotricytic stoma, and stomatal clusters were found in the lower epidermis surface of leaves. The common presence of calcium oxalate crystals and sclereid cells was observed in the stem and the petiole. All epidermis fragments, parenchymal fragments, starch granules, calcium oxalate crystals, sclereid cells, spiral vessels, and red-brown oleoresin masses are standard components present in leaf powder. The physicochemical parameters of leaf powders all meet acceptable standards. The phytochemical compositions of the leaf extract contain lipids, carotenoids, essential oil, reducing compounds, amino acids, triterpenoids, saponins, tannins, and flavonoids.

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Leaf morphology and anatomy ofCamelliasectionCamellia(Theaceae)

Cited by 29 publications

References 18 publications

Comparative leaf anatomy and micromorphology of Psychotria species (Rubiaceae) from the Atlantic Rainforest

Comparative leaf anatomy and micromorphology of Psychotria species (Rubiaceae) from the Atlantic Rainforest

Tea plant genomics: achievements, challenges and perspectives

Morphological, physicochemical, and phytochemical characterization of Camellia dormoyana (Pierre) Sealy from Vietnam

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