D. D. Sokoloff

Lomonosov Moscow State University | MSU · Department of Higher Plants

Use of ontologies is a major trend of modern comparative, evolutionary and developmental biology (Dahdul et al., 2012; Mungall et al., 2012; Cooper et al., 2018; Walls et al., 2019). An ontology includes a set of standardized terms (each with a numerical code) describing features of structure and development as well as logical relationships between...

We review the diversity and development of archegonia, the female reproductive organs of land-plant gametophytes. The archegonium is a uniquely land-plant structure, and studies of its evolution benefit from use of a comparative approach in a phylogenetic context. Archegonia of most land plants share a common developmental motif, here termed a T-sh...

Eriocaulaceae (Poales) differ from potentially related Xyridaceae in pattern of floral organ arrangement relative to subtending bract (with median sepal adaxial). Some Eriocaulaceae possess reduced and non-trimerous perianth, but developmental data are insufficient. We conducted a SEM investigation of flower development in three species of Eriocaul...

European species of Nuphar are among the most accessible members of the basal angiosperm grade, but detailed studies using scanning electron microscopy are lacking. We provide such data and discuss them in the evolutionary context. Dorsiventral monopodial rhizomes of Nuphar bear foliage leaves and non-axillary reproductive units (RUs) arranged in a...

Finding morphological differences between cytotypes that are stable throughout their geographical range is important for understanding evolution of polyploid complexes. The ancient monocot lineage Acorus includes two groups, of which A. calamus s.l., an important medicinal plant, is a polyploid complex with a centre of diversity in Asia. European p...

COLE, SOKOLOFF, REMIZOWA, LEI, YU (2023) ALISMATALES 泽泻目系统发育关系与性状 © Cole, Sokoloff, Remizowa, Lei, Yu (CC-BY) 2023, Chinese version of: COLE, SOKOLOFF, REMIZOWA (2020) Alismatales Phylogeny Poster (AlisPP) • 包含了14个科，约160属，4800个物种 • 拓扑结构树基于 Ross TG等人的研究（2015） • 枝长无意义，不代表实际的时间尺度 • 属、种数（灰色）为估计值 • 参考文献: Kubitzki (1998) FGVP IV; Ross et al. (2015), Soko...

The basal monocot genus Acorus comprises essential oil-producing plants widely used in traditional medicine in various countries, including India. Acorus calamus sensu lato is a polyploid complex where the essential oil composition, to some extent, depends on the ploidy level. The literature recognizes diploids (in temperate Asia and North America)...

Pendent sessile flowers of Chamaelirium japonicum (Willd.) N. Tanaka appear zygomorpic, but they do not possess a bilateral symmetry. The flowers are subtended by a vestigial bract and lack a bracteole. The perianth consists of two small tepals on the abaxial side of the flower and four large tepals, none of which is median. Because the short tepal...

Heinrich Wilhelm Schott (1794-1865) was one of the pioneering researchers in the taxonomy of the species-rich monocot family Araceae. He described numerous new plant species in various genera, including Acorus, which is currently segregated as a monogeneric family and order occupying a position sister to the rest of the monocots. While describing h...

COLE TCH, BACHELIER JB, SOKOLOFF DD, REMIZOWA MV (2020) Phylogénie des ALISMATALES © Cole, Bachelier, Sokoloff, Remizowa 2020 (CC-BY) • 14 familles, 166 genres, 4800+ espèces • arbre phylogénétique d'après Ross TG et al. (2015) • longueurs des branches délibérées, n'exprimant pas l'échelle de temps réelle • nombres de genres et d'espèces sont appro...

COLE TCH, SOKOLOFF DD, REMIZOWA MV (2019) Phylogenie der ALISMATALES © Cole, Sokoloff, Remizowa 2019 (CC-BY) • 14 Familien, 166 Gattungen, 4800+ Arten • Stammbaum basierend auf Ross TG et al. (2015) • Astlängen willkürlich, ohne Zeitbezug • Gattungs- und Artenzahlen sind ungefähr • Quellen: Kubitzki (1998) FGVP IV; Ross et al. (2015), Sokoloff et a...

The basalmost monocot genus Acorus is well-known for its use in traditional oriental medicine. It comprises the groups of A. calamus and A. gramineus. A recent study recognized three species in the latter group, A. gramineus, A. macrospadiceus, and A. tatarinowii. The material currently known as A. tatarinowii has been extensively studied as a sour...

Introduction Understanding the complex inflorescence architecture and developmental morphology of common buckwheat ( Fagopyrum esculentum ) is crucial for crop yield. However, most published descriptions of early flower and inflorescence development in Polygonaceae are based on light microscopy and often documented by line drawings. In Fagopyrum an...

Memorial Bibliography of Alexey Borisovich Shipunov

Alexey Borisovich Shipunov Alexey Shipunov was an outstanding person in many ways. An accomplished botanist, he was also a programmer and a teacher. One of his many impressive features was his universality. Indeed, he was interested in a vast range of things, and his professional scope accordingly tended to be universal: for example, as a taxonomis...

Exocarp anatomy of 30 species of Atraphaxis has been studied to shed light on possible diagnostic and phylogenetic significance of carpological characters. The diversity of the exocarp structure observed in Atraphaxis was comparable to that in the entire tribe Polygoneae. The size of the exocarp cells, the size and shape of the lumen and its branch...

Ceratophyllum is an ancient and phylogenetically isolated angiosperm lineage. Comparisons between Ceratophyllum and other angiosperms are hampered by uncertainty in inferring organ homologies in this genus of specialized aquatics. Interpretation of shoot morphology is especially problematic in Ceratophyllum. Each node has several leaf-like appendag...

A reassessment of taxonomy and geographical distribution of a widespread Asian mycoheterotrophic species Petrosavia sakuraii is presented. Petrosavia amamiensis recently described from the Japanese Ryukyu Islands is demonstrated to fit closely the morphological diversity of P. sakuraii. Data from geography, molecular phylogenetics and reproductive...

The grass family (Poaceae) includes cereal crops that provide a key food source for the human population. The food industry uses the starch deposited in the cereal grain, which develops directly from the gynoecium. Morphological interpretation of the grass gynoecium remains controversial. A bistigmatic grass gynoecium has two sterile carpels, each...

Molecular phylogenetic analyses have revealed a superclade of mesangiosperms with five extant lineages: monocots, eudicots, magnoliids, Ceratophyllum and Chloranthaceae. Both Ceratophyllum and Chloranthaceae are ancient lineages with a long fossil record; their precise placement within mesangiosperms is uncertain. Morphological studies have suggest...

Premise: The sporoderm of seed-plant pollen grains typically has apertures in which the outer sporopollenin-bearing layer is relatively sparse. The apertures allow regulation of the internal volume of the pollen grain during desiccation and rehydration (harmomegathy) and also serve as sites of pollen germination. A small fraction of angiosperms un...

COLE, SOKOLOFF, REMIZOWA, TURDIBOEV (2022) ALISMATALES – O’zaro Munosabatlar va Xususiyatlar, Uzbek version of: COLE, SOKOLOFF, REMIZOWA (2019) ALISMATALES – Relationships and Features • 14 oilalar, ~160 turkumlar, taxminan 4800 turlar • daraxt topologiyasi Ross et al. (2015) asosida • shoxlar uzunligi ataylab qilingan haqiqiy vaqt o’lchovini angla...

Lotus dorycnium s.l. is a complex of taxa traditionally regarded as members of Dorycnium. It has a wide Mediterranean range, extending in the north to Central and Eastern Europe, and in the east to the Crimea, the Caucasus, and the Western Caspian region. Molecular phylogenetic data support placement of the L. dorycnium complex in the genus Lotus....

The family Rapateaceae represents an early-divergent lineage of Poales with biotically pollinated showy flowers. We investigate developmental morphology and anatomy in all three subfamilies and five tribes of Rapateaceae to distinguish between contrasting hypotheses on spikelet morphology and to address questions on the presence of nectaries and gy...

Grasses produce large amounts of pollen and are among the main causes of pollen allergy worldwide. Quantification of the roles of individual grass species in airborne pollen is an important task, because morphologically indistinguishable pollen grains of different species may differ in al-lergenicity. This requires knowledge of the pollen productio...

The revision of the high-rank classification units of the cl. Salicornietea fruticosae has been carried out. Two subclasses are included into the renewed system of syntaxa of this class: Arthrocnemenea uniting Mediterranean (usually coastal) communities of perennial hyperhalophytes and Kalidienea including mainly inland East-European and Asian comm...

Naturally occurring mutants whose phenotype recapitulates the changes that distinguish closely related species are of special interest from the evolutionary point of view. They can give a key about the genetic control of the changes that led to speciation. In this study, we described lepidium-like ( lel ), a naturally occurring variety of an allote...

COLE, SOKOLOFF, REMIZOWA, MURSIDAWATI (2021) ALISMATALES – Kekerabatan dan Ciri utama • 14 suku, ~160 marga, tidak kurang dari 4800 jenis • pohon topologi berdasarkan pada Ross TG et al. (2015) • panjang cabang dibuat sedemikian, dan tidak mewakili skala waktu sebenarnya • jumlah marga/jenis (tercetak kelabu) mendekati jumlah perkiraan • Pustaka: K...

COLE TCH, SOKOLOFF DD, REMIZOWA MV, HAMDY RS, EL HADIDY AH (۲۰۲۱) ALISMATALES ‫رتبة المزماريات - العلاقات والميزات Arabic version of: Cole TCH, Sokoloff DD, Remizowa MV (2021) Alismatales Phylogeny Poster - relationships among the 14 families and their major characteristics

Pseudomonomerous gynoecia with three (or four) carpels are unknown in the species-rich core group of Apiales, but this condition is shared by three species-poor families (Pennantiaceae, Torricelliaceae, Griseliniaceae) that form the basal grade of the order. Testing a hypothesis on the ancestral nature of carpel dimorphism in Apiales requires compa...

The tribe Loteae of the family Leguminosae has major centers of diversity in the Mediterranean Region and California. It is used here to illustrate different traditions of taxonomic interpretation of infraspecific variation among researchers in different continents. Recent accounts of European and Mediterranean taxa commonly make an emphasis on rec...

Background The extreme southwest of Australia is a biodiversity hotspot region that has a Mediterranean-type climate and numerous endemic plant and animal species, many of which remain to be properly delimited. We refine species limits in Anarthria , a Western Australian endemic genus characterised by the occurrence of the greatest number of plesio...

Anatomy is one of the oldest disciplines of plant science, and there is a huge amount of accumulated knowledge. At the same time, anatomy is highly important as a linking medium between several key branches of modern plant science. Detailed anatomical studies, these days using X-ray microtomography, allow much more detailed understanding of plant f...

The Mediterranean region is a center of species and genetic diversity of many plant groups, which served as a source of recolonization of temperate regions of Eurasia in Holocene. We investigate the evolutionary history of species currently classified in Lotus sect. Bonjeanea in the context of the evolution of the genus Lotus as a whole, using phyl...

Monogeneric Aponogetonaceae is sister to the rest of tepaloid core Alismatales and its members are characterized by a number of plesiomorphic features including monosulcate pollen. A recent study documented the earliest fossil pollen records of Aponogeton in late Cretaceous and early Cenozoic as well as recognized six pollen types in the genus. How...

A new species Althenia tzvelevii is described from south western Australia. This is the second species after A. bilocularis described with bilocular anthers. Illustrations of plant morphology are provided by means of SEM images and habitat photographs are included. The phylogenetic relationships of the new species were investigated using five plast...

The monocot family Triuridaceae is a morphological misfit with respect to several traits of floral morphology, including the uniformly apocarpous polymerous gynoecium and the famous inside-out flowers of Lacandonia. Although Triuridaceae are crucially important for understanding the floral evolution of Pandanales and angiosperms in general, signifi...

COLE, SOKOLOFF, REMIZOWA, CARLSEN, ORTIZ (2020) ALISMATALES – Relaciones y características • 14 familias, ~160 géneros, aprox. 4800 especies • topología del árbol basada en Ross TG et al. (2015) • las longitudes de las ramas son deliberadas, no expresan la escala de tiempo real • los números de géneros/especies (en gris) son aproximados Referencias...

COLE, SOKOLOFF, REMIZOWA, CAMELO, COELHO (2020) ALISMATALES – Relações e Características, Portuguese version of: COLE TCH, SOKOLOFF DD, REMIZOWA MV (2019) ALISMATALES – Relationships and Features • 14 famílias, 166 gêneros, cerca 4800 espécies • árvores de topologia baseado em Ross TG et al. (2015) • comprimento dos ramos deliberados, não expressan...

COLE, SOKOLOFF, REMIZOWA, KHOA (2020) BỘ TRẠCH TẢ – các mối liên hệ và đặc điểm. Vietnamese version of: COLE, SOKOLOFF, REMIZOWA (2019) ALISMATALES: Relationships and Features • 14 họ, 166 chi, khoảng 4800 loài • Hình thái cây phát sinh loài dựa trên nghiên cứu của Ross TG et al. (2015) • Chiều dài của nhánh phân loài được tính toán và không thể hi...

An aquarium plant that has been sold in the aquarium trade for about 10 years was identified as Rhynchospora albescens (Cyperaceae) and molecularly analysed. For the first time the DNA sequence of this species as well as SEM images of young flowers are shown in this article. While three stamens are normal for the species of the genus Rhynchospora s...

КОУЛ ТКГ, СОКОЛОВ ДД, РЕМІЗОВА МВ, ШИЯН НМ (2019) ALISMATALES (ЧАСТУХОЦВІТІ) – систематика та ознаки, Ukrainian version: COLE TCH, SOKOLOFF DD, REMIZOWA MV (2019) ALISMATALES – Relationships and Features • 14 родин, 166 родів, бл. 4800 видів • топологічна схема філогенетичного дерева за Ross TG et al. (2015) • довжина гілок довільна і не відображає...

КОУЛ, СОКОЛОВ, РЕМИЗОВА (2019) ALISMATALES (ЧАСТУХОЦВЕТНЫЕ) родственные отношения и основные признаки • 14 семейств, 166 родов, около 4800 видов • топология дерева по Ross TG et al. (2015) • длина ветвей произвольная, не отражает реальный уровень дивергенции таксонов • числа родов/видов (даны серым) приблизительные. Список литературы: Kubitzki (199...

COLE, SOKOLOFF, REMIZOWA (2019) ALISMATALES – Relationships and Features • an educational A4-size handout • phylogeny and characters of the member families of the order • 14 families, 166 genera, ca. 4800 spp. • tree topology based on Ross TG et al. (2015)

Reports on whether typical apertures occur in pollen of Althenia (Potamogetonaceae) are controversial. The question is of interest because relatively few submerged aquatic angiosperms possess localised apertures, and the phylogenetic placement of Potamogetonaceae suggests an ancestral nature for the inaperturate condition in this family. Pollen gra...

В работе рассмотрены систематика, молекулярная филогенетика, морфолого-анатомическое строение и развитие репродуктивных органов и палинология видов рода Althenia в объеме мировой флоры.

Anarthria, Lyginia and Hopkinsia, endemic to south-western Western Australia, differ from the rest of Restionaceae sensu APG IV in the presence of dithecal rather than monothecal anthers. Dithecal and monothecal Restionaceae form two well-supported sister clades in molecular phylogenetic trees, but shared morphological features of Anarthria, Lygini...

The flora of the southwestern Australian biodiversity hotspot is rich in endemic species, many of which remain to be discovered or properly described; estimates of species diversity and levels of endemism should take into account the possible occurrence of cryptic species. Here we explore taxonomic diversity in a Western Australian lineage belongin...

Floral symmetry is widely known as one of the most important structural traits of reproductive organs in angiosperms. It is tightly related to the shape and arrangement of floral parts, and at the same time, it plays a key role in general appearance (visual gestalt) of a flower, which is especially important for the interactions of zoophilous flowe...

Contort petal aestivation is common in several groups of eudicots. Two mirror-shaped types of contort aestivation can be recognized. In some eudicots (mostly asterids), handedness of the contort corolla is fixed at the level of species. In other species (mostly rosids), its handedness is not fixed, and both left- and right-contort corolla is then p...

Floral and fruit morphology of the early eudicot Ranunculaecarpus quinquecarpellatus Samyl. is described based on details from sectioning and microscopy of the permineralized type material from the Albian Buor-Kemyus Formation of the Zyryanka coal basin. Serial sections confirmed most of the originally described characters but revealed additional i...

A quick look through changes in angiosperm taxonomy proposed during the last decades creates an impression of sandwich-like pattern of distribution of inconsistencies between morphological and molecular phylogenetic data across taxonomic ranks. Indeed, the traditional concept of monocots and dicots is generally well-supported, but currently accepte...

Fusion between floral organs or their parts is believed to have played key roles in the origin and subsequent diversification of angiosperms. Two types of fusion can be recognized: postgenital and congenital. Postgenital fusion is readily observable during flower development: primary morphological surfaces of contacting structures meet and join dur...

The late Eocene ambers provide plethora of animal and plant fossils including well-preserved angiosperm flowers from the Baltic amber. The Rovno amber from NW Ukraine resembles in many aspects the Baltic amber; however, only fossilized animals and some bryophytes have yet been studied from the Rovno amber. We provide the first detailed description...

Transitions in corolla symmetry are an important aspect of angiosperm floral evolution. Contort petal aestivation is common in several groups of eudicots. In rosids, the direction of overlap between adjacent petals (handedness) of the contort corolla is often labile among flowers in a single inflorescence, but in asterids, handedness is usually sta...

The presence of a gynoecium composed of carpels is a key feature of angiosperms. The carpel is often regarded as a homologue of the gymnosperm megasporophyll (that is, an ovule-bearing leaf), but higher complexity of the morphological nature of carpel cannot be ruled out. Angiosperm carpels can fuse to form a syncarpous gynoecium. A syncarpous gyno...

The complete plastid genome of New Zealand endemic species Carmichaelia australis was assembled de novo from Next-Generation Sequencing data using CLC Genomics Workbench v.5.5. The plastome is 122,805 bp in length and lacks an inverted repeat (IR) region. The plastid genome of Carmichaelia contains 110 unique genes including 30 tRNA, 4 rRNA, and 76...

During recent decades, Althenia with two species in Eurasia and Africa was accepted as one of four genera of submerged aquatics comprising the family Zannichelliaceae. Molecular phylogenetic data confirmed monophyly of Zannichelliaceae in its traditional circumscription but placed the clade together with Potamogeton and its segregate genera, so tha...

The presence of a gynoecium composed by carpels is a key feature of angiosperms. The carpel is often viewed as homologous to megasporophyll of gymnosperms (i.e., a leaf bearing ovules), but it is possible that its morphological nature is more complex. Carpels of angiosperms can unite to form a syncarpous gynoecium. Most syncarpous gynoecia possess...

The book summarizes current ideas on structural diversity and evolution of the family Araliaceae. Special attention is paid to comparative morphology, systematics and evolution of Schefflera, the largest traditionally recognized genus of the family. A critical review of studies on classification of the order Apiales and family Araliaceae and on rec...

PREMISE OF THE STUDY: Revealing the relative roles of gradual and abrupt transformations of morphological characters is an important topic of evolutionary biology. Gynoecia apparently consisting of one carpel have evolved from pluricarpellate syncarpous gynoecia in several angiosperm clades. The process of reduction can involve intermediate stages,...

Lotus comprises ca. 130 species of herbs, semishrubs and shrubs native to the Old World, including important pasture crops and a model legume, L. japonicus. Earlier nrITS-based phylogenies were incongruent with all taxonomic classifications of the genus. In particular, members of the former genus Dorycnium were unexpectedly placed near species of L...

Collateral bundles with external position of the phloem characterize the stem vasculature of most seed plants. An earlier study highlighted the occurrence of inverted peripheral bundles in the leafless inflorescence peduncle of the rare Australian aquatic Maundia triglochinoides. This unusual feature and other morphological and molecular data suppo...

Scheuchzeria palustris, the only member of Scheuchzeriaceae, is unique among Alismatales in several characters, including flower-subtending bracts with conspicuous laminas and pollen dispersed in permanent dyads. Earlier studies revealed unidirectional flower development in some monocots with massive flower-subtending bracts, but not in Scheuchzeri...

The recently described species Lotus antiochianus İlçim & Behçet is a later synonym of Hammatolobium lotoides Fenzl (Leguminosae: Loteae). Three species-poor genera (Hammatolobium, Tripodion, Cytisopsis) are closely related to the species-rich genus Lotus. The possibility of adopting a wider generic concept in the tribe Loteae is discussed, and it...

The angiosperm gynoecium consists of elementary units called carpels. These can be free (apocarpy) or united (coenocarpy, or syncarpy in a wide sense). One of the most complicated problems of evolutionary morphology of angiosperms is distinguishing monomerous and pseudomonomerous gynoecia. The former are assumed to be derived by the reduction of th...

In most seed plants, cotyledons formed within the seed act as haustorial organs, as well as playing a key role in releasing the shoot apex from the seed coat on germination. Emergence of the shoot apex often results from asymmetric intercalary growth of the cotyledon bases. This process avoids the principal spatial constraint on germination in seed...

Female flower and fruit anatomy, including vasculature, are studied for the first time in Tetroncium (Juncaginaceae: Alismatales). Other members of Juncaginaceae (and the relatively close Maundiaceae) possess a peculiar type of gynoecium with pronounced carpel fusion via the floral centre. Their carpels are supplied by individual vascular traces an...