TO THE QUESTION OF MORPHOLOGY OF MYRICA GALE L. GENERATIVE PLANTS

The distribution of Myrica gale on the coast of the Gulf of Finland is confined to regularly flooded coastal habitats, characterized by milder environmental conditions compared to the uplands and under the residual influence of the Gulf Stream. In Russia, M. gale is located on the northeastern border of the range. The study of the features of the species that contribute to the dispersal in the northern direction, and the properties of the environment that prevent such dispersal, is always of great interest. Growth in colder conditions in comparison with other members of the family, mainly inhabitants of the tropical and subtropical areas, affected the formation of such adaptations as deciduousness, changes in the structure of flowers and bark, as well as the presence of a large number of protective leaf organs. Their quantitative and qualitative analysis made it possible to establish the presence of 4 lignified parchment-like scales that do not fall completely and 6 membranous with partially lignified tops scales that stretch out while unfolding. An attempt was made for the first time to analyze the spatial structure of the shoots of the species. A sympodial growth of shoots and the phenomenon of acrotonia, as well as a spiral formation of lateral shoots, were established. In the structure of the mature generative branch of M. gale there were identified 3 types of shoots: long growth, medium and short, and also their leaf series were analyzed. Leaf series of short and medium shoots are characterized by significant asymmetry compared to leaf series of long shoots and are incomplete. The curves were constructed on the basis of such characteristics of leaf organs as their total number, length along the central vein, including the petioles (if they are presented), and internode lengths. A large number of rudiments of leaf organs determines the gradual formation of the buds, and the imperfection of the structure of the scales reflects the weak protective ability of these organs. Both features indicate the deep ancientness of the species and the difficulty in adapting to cold environmental conditions. Mature generative branches of M. gale are similar in habit to small trees, which is of particular interest in the context of modeling possible directions of adaptation during the spread of species of subtropical origin to more northern regions.

Discovery of a novel brown algal genus and species Setoutiphycus delamareoides (Phaeophyceae, Ectocarpales) from the Seto Inland Sea, Japan

We describe a new genus and species of brown algae from the Seto Inland Sea, Japan. This species is similar to Delamarea in gross morphology and anatomy, but distinctive in having longer thalli with rare branching and shorter cortical cells. In culture, pluri-zoids derived from plurilocular zoidangia on the erect thalli developed into filamentous gametophytes bearing ectocarpoid plurilocular zoidangia, but also formed parenchymatous erect thalli of sub-sympodial growth similar to Trachynema often having branches, and formed lateral and terminal plurilocular zoidangia. Molecular phylogenies using concatenated chloroplast and mitochondrial gene sequences showed the new alga nested in the clade composed of ectocarpalean genera with diffuse growth, parenchymatous thalli, and multiple chloroplasts, but this species is distinctive. Therefore, we propose Setoutiphycus delamareoides gen. & sp. nov. for this new alga, and provisionally place it in Chordariaceae, Ectocarpales. The Seto Inland Sea repeatedly dried during sea level regressions during glacial periods, and the present sea level recovered after the last glacial maximums (LGM), ca. 10,000 years ago. Therefore, it is unlikely that the species evolved within this area. Its distribution in the area may be explained as a remnant population that survived in refugia in southern Japan during the LGM.

Ontogeny of Dianthus andrzejowskianus (Zapal.) Kulcz. in the conditions of the Bashkir Pre-Ural

The article is devoted to the results of the introduction study of Dianthus andrzejowskianus (Zapal.) Kulcz. on the basis of the South-Ural Botanical Garden-Institute of Ufa Federal Research Centre of RAS. Data on the ontogenesis of this species are provided. Three age periods (latent, pregenerative and generative) and 6 ontogenetic states (seedlings, juvenile, immature, virginal, young and middle-aged generative states) are described. Indicator signs of age-related conditions are: for seedlings - the presence of a thin germ root, two oval-shaped cotyledons; for juvenile individuals - the appearance of the first true leaves; for immature individuals - the transition of plants to sympodial growth and the growth of the root system. In the virginal state, the vegetative sphere increases, the plant acquires the features of adults. Young generative plants have few reproductive shoots. The middle-aged generative state is characterized by the most powerfully developed vegetative and reproductive spheres.

A Sister of PIN1 gene in tomato (Solanum lycopersicum) defines organ initiation patterns by maintaining epidermal auxin flux

The spatiotemporal localization of the plant hormone auxin acts as a positional cue during early leaf and flower organogenesis. One of the main contributors to auxin localization is the auxin efflux carrier PIN-FORMED1 (PIN1). Phylogenetic analysis has revealed that PIN1 genes are split into two sister clades; PIN1 and the relatively uncharacterized Sister-Of-PIN1 (SoPIN1). In this paper we identify entire-2 as a loss-of-function SlSoPIN1a (Solyc10g078370) mutant in Solanum lycopersicum. The entire-2 plants are unable to specify proper leaf initiation leading to a frequent switch from the wild type spiral phyllotactic pattern to distichous and decussate patterns. Leaves in entire-2 are large and less complex and the leaflets display spatial deformities in lamina expansion, vascular development, and margin specification. During sympodial growth in entire-2 the specification of organ position and identity is greatly affected resulting in variable branching patterns on the main sympodial and inflorescence axes. To understand how SlSoPIN1a functions in establishing proper auxin maxima we used the auxin signaling reporter DR5::Venus to visualize differences in auxin localization between entire-2 and wild type. DR5::Venus visualization shows a widening of auxin localization which spreads to subepidermal tissue layers during early leaf and flower organogenesis, showing that SoPIN1 functions to focus auxin signaling to the epidermal layer. The striking spatial deformities observed in entire-2 help provide a mechanistic framework for explaining the function of the SoPIN1 clade in angiosperm species.

Filogenia del complejo Heterotaxis Lindl. (Maxillariinae): evolución de la arquitectura vegetativa y los síndromes de polinización

<div class="page" title="Page 1"><div class="layoutArea"><div class="column"><p><span>Heterotaxis </span><span>Lindl. comprises about 11 primarily epiphytic species ranging from the southeastern U.S.A. (Florida) and the Greater Antilles to Brazil, with most of the species occurring in Central and South America. This complex is characterized by a sympodial growth habit, with short rhizomes, lateral- ly compressed oblong pseudobulbs (unifoliate), and subtended by various leaf-bearing sheaths </span></p></div></div></div>

Taxonomy and conservation of the Brazilian extra-Amazonian species of Philodendron subg. Pteromischum (Araceae)

Philodendron subg. Pteromischum is one of the three Philodendron subgenera and most diverse within Amazonia. It can be recognised by anisophyllous sympodial growth, long sheaths, short petiole, gynoecia with broad shallow compitum, and numerous ovules per locule. The taxonomic revision for Brazilian extra-Amazonian species was based on the analysis of 590 herbaria specimens. Nine Brazilian extra-Amazonian Pteromischum species were recognized, five names previously recognised for the studied area were treated as synonyms. All the species were described and mapped. An identification key and comments on taxonomy, nomenclature, conservation, phenology were provided for each species. The concepts of leaf-sheath and petiole are also clarified.

Growth, fructification and plastochron index of different branches in the crown of the husk tomato (Physalis ixocarpa Brot.)

The husk tomato (<em>Physalis ixocarpa</em> Brot.) is commonly cultivated in Central Mexico for its fruits. The plants of cv. 'Rendidora' show sympodial growth after forming 3-5 internodes in the main axis. From there on, each internode is terminated with a node having one flower bud, one leaf and 2 branches (dichasium type of branching). With the exclusion of the first 3 bifurcations which initiate 4 equal apparent main branches of the plant, each subsequent bifurcation has unequal ramifications: a stronger one which prolongs the apparent main branch, and a weaker one which serves as the origin of an apparent lateral branch. The apparent lateral branches form smaller internodes but these internodes require more time for their growth which is the reason that the plastochron lasts longer in the apparent lateral branches. By forming a smaller number of internodes in the same period of time, the apparent lateral branches reach a lower value of the plastochron index. All apparent lateral branches of a plant produce a greater total number of fruits, but a large proportion of them abscise. Due to this, the harvested fruits come principally from the apparent main branches. The phenology of the husk tomato plant is described. Its short period of development makes possible its cultivation in regions with a limited vegetative period.

Shoot architecture in the VitaceaeThis article is one of a selection of papers presented at the symposium on Vitis at the XVII International Botanical Congress held in Vienna, Austria, in 2005.

This paper examines the question of how the unique shoot architectural pattern of the Vitaceae, typically with leaf-opposed tendrils or inflorescences in a three-node modular repetitive pattern, can be related to the traditional concepts of monopodial and sympodial shoot development. Based on complete comparative morphological developmental studies of 13 species in six genera, supplemented with observations of 21 other taxa, we have found five shoot architectural patterns in the family. The pattern of shoot architecture is consistent within a species, but there may be more than one pattern present within a genus. Species that lack tendrils, thus exhibiting pattern 1, show sympodial growth. Taxa exhibiting patterns 2, 3, and 4, with tendrils at two of three nodes and with progressively one, two, or three axillary buds within the three-node cycle, grow monopodially, and taxa that exhibit pattern 5, with both tendrils and axillary buds at every node, achieve the pattern via either monopodial or sympodial growth, depending on the species. Although rare in the Vitaceae, pattern 1 is the only one shared with the sister family Leeaceae. We conclude that this was the original shoot architectural pattern, and that the monopodial pattern present in most species today is derived, and unique to the Vitaceae.