Systematic implications of pollen morphology in <i>Elsholtzia</i> (Elsholtzieae–Lamiaceae)

Jang, Tae‐Soo; Jeon, Yun-Chang; Hong, Suk‐Pyo

doi:10.1111/j.1756-1051.2010.00934.x

Cited by 6 publications

(3 citation statements)

References 18 publications

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“…The center of the greatest diversity in the genus is in eastern Asia, particularly China, Korea and Japan, with approximately 40 species classified in three sections Hedge 1994, Govaerts et al 2020). The most recent studies indicate that the three currently recognized sections in Elsholtzia correlate well with molecular phylogenetic results and pollen wall structures (Table 1; Jang et al 2010, Li et al 2017.…”

Section: Yun-chang Jeon Tae-soo Jang and Suk-pyo Hongsupporting

confidence: 58%

Nutlet morphology in the tribe Elsholtzieae (Lamiaceae)

Jeon

Jang

Hong

2020

Nordic Journal of Botany

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A comprehensive study on nutlet morphology on 46 taxa from the tribe Elsholtzieae was conducted using stereomicroscopy, light microscopy and scanning electron microscopy. The objectives were to evaluate the nutlet characteristics in a systematics context and to provide additional evidence for taxon delimitation. The nutlet shape varied from elliptical, widely elliptical, spheroidal and ovate to pyriform. The size ranged from 0.50 to 2.70 mm in length and 0.34 to 2.65 mm in width. The three types of trichomes included simple non‐glandular trichomes (Collinsonia punctata), clavate non‐glandular trichomes (Elsholtzia cephalantha) and peltate glandular trichomes (Mosla grosseserrata and M. chinensis). We also report the presence of a mucilaginous reaction in nine species of the genus Elsholtzia in Elsholtzieae for the first time. Four types (undulate, papillae‐like projection, thorn‐like pattern and reticulate) and three subtypes (reticulate, reticulate‐cellular and supra‐reticulate) of nutlet surface patterns in the mid‐ventral region were recognized in Elsholtzieae based on the differences in cell outline, outer periclinal walls and dentations of the anticlinal walls. These nutlet micromorphological results may serve as a reference for future hypotheses on the classification of the tribe Elsholtzieae.

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Section: Yun-chang Jeon Tae-soo Jang and Suk-pyo Hongsupporting

confidence: 58%

Nutlet morphology in the tribe Elsholtzieae (Lamiaceae)

Jeon

Jang

Hong

2020

Nordic Journal of Botany

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“…), rugulose-bireticulate ( E. flava Benth. ), and bireticulate (16 other studied species) 35 . These types correspond well with our three major groups: Clade IV, Clade I Subclade IV, and Clade I Subclades I–III.…”

Section: Discussionmentioning

confidence: 99%

Molecular phylogenetics and biogeography of the mint tribe Elsholtzieae (Nepetoideae, Lamiaceae), with an emphasis on its diversification in East Asia

Liu

et al. 2017

Sci Rep

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Elsholtzia and its allied genera such as Collinsonia and Perilla (tribe Elsholtzieae, Lamiaceae) are an ecologically and economically important plant group consisting of ~71 species, with most species distributed in East and Southeast Asia, and several species in North America. Their phylogeny and historical biogeography resulting in a distant intercontinental disjunction are poorly understood. Here we use two nuclear (ETS, ITS) and five chloroplast (rbcL, matK, trnL-F, ycf1, ycf1-rps15) fragments to reconstruct the phylogeny, biogeographic history, and patterns of diversification of Elsholtzieae. The tribe Elsholtzieae is monophyletic and divided into five clades. The woody Elsholtzia species are nested within herbaceous ones and are inferred to have evolved from herbaceous ancestors. Molecular dating shows that the five major clades were established during the Eocene period, but most of the modern diversity did not originate until the Miocene. The divergence between the New World Collinsonia and the Old World Mosla-Keiskea-Perilla clade was dated to the mid-Miocene. Ancestral area reconstructions suggest that the tribe originated in East Asia, and then dispersed to Southeast Asia and North America. Overall, our findings highlight the important roles of the uplifts of the Qinghai-Tibetan Plateau (QTP) and climate changes from Middle Miocene onwards in promoting species diversification of Elsholtzieae.

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“…Similarly, (Harley et al, ) using the light microscopy (LM), SEM, and TEM and described four types of pollen in the tribe Ocimeae, three of them were further divided into subtypes potentially valuable taxonomic features. The pollen of Elsholtzia (Elsholtzieae‐Lamiaceae) were small to medium sized, prolate‐spheroidal to prolate, and rarely oblate‐spheroidal to subprolate and hexacolpate (Jang, Jeon, & Hong, ).…”

Section: Introductionmentioning

confidence: 99%

Taxonomic study of subfamily Nepetoideae (Lamiaceae) by polynomorphological approach

Gul

Ahmad

Zafar

et al. 2019

Microscopy Res & Technique

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The present study is insight into pollen morphology for characterizing species and their utility in the taxonomic separation of certain taxa of subfamily Nepetoideae (Lamiaceae) from Pakistan.The pollen micromorphology of 11 species of the Nepetoideae was analyzed and documented using light microscopy and scanning electron microscopy (SEM) for both qualitative and quantitative characteristics. Most species have hexazonocolpate pollen grains but trizonocolpate and tetrazonocolpate pollen with circular and oval amb were also rarely observed in Mentha spicata.The basic pollen shape in most of the studied species was subspheroidal but prolate grains were also observed in M. spicata, S. coccinea, and S. plebeia. The exine sculpturing of Nepetoideae pollen was taxonomically very informative particularly at subfamily level. Observations of exine sculpturing with SEM revealed various types of pollen grains: reticulate, bireticulate, microreticulate, perforate, aerolate, and gammate. The bireticulate type further subdivided into three subtypes based on the number of secondary lumina in each primary lumen and is characterized by varying characteristics of the secondary reticulum and primary muri. A significant variation was observed in colpus surface ornamentation. The maximum polar diameter was found in O. americanum (58 ± 5.8 μm) and the maximum equatorial diameter observed in O. basilicum (50.25 ± 1.37 μm). Pollen features of the studied species were discussed and compared based on the current taxonomical concepts. The results showed that pollen traits of the subfamily Nepetoideae was found significant to classify the taxa. Furthermore, pollen features provide additional evidence to distinguish macromorphologically similar taxa from each other. K E Y W O R D S micromorphology, Nepetoideae, pollen, SEM, taxonomic significance

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Systematic implications of pollen morphology in Elsholtzia (Elsholtzieae–Lamiaceae)

Cited by 6 publications

References 18 publications

Nutlet morphology in the tribe Elsholtzieae (Lamiaceae)

Nutlet morphology in the tribe Elsholtzieae (Lamiaceae)

Molecular phylogenetics and biogeography of the mint tribe Elsholtzieae (Nepetoideae, Lamiaceae), with an emphasis on its diversification in East Asia

Taxonomic study of subfamily Nepetoideae (Lamiaceae) by polynomorphological approach

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