Temat: flower development - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: MicroRNA-mediated regulation of flower development in grasses
Autorzy:: Smoczynska, Aleksandra
Szweykowska-Kulinska, Zofia
Tematy:: miRNA
grasses
flower development
ABCDE model; Pokaż więcej
Wydawca:: Polskie Towarzystwo Biochemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1038724.pdf Link otwiera się w nowym oknie
Opis:: Flower structure in grasses is very unique. There are no petals or sepals like in eudicots but instead flowers develop bract-like structures - palea and lemma. Reproductive organs are enclosed by round lodicule that not only protects reproductive organs but also plays an important role during flower opening. The first genetic model for floral organ development was proposed 25 years ago and it was based on the research on model eudicots. Since then, studies have been carried out to answer the question whether this model could be applicable in the case of monocots. Genes from all classes found in eudicots have been also identified in genomes of such monocots like rice, maize or barley. What's more, it seems that miRNA-mediated regulation of floral organ genes that was observed in the case of Arabidopsis thaliana also takes place in monocots. MiRNA172, miRNA159, miRNA171 and miRNA396 regulate expression of floral organ identity genes in barley, rice and maize, affecting various features of the flower structure, ranging from formation of lemma and palea to the development of reproductive organs. A model of floral development in grasses and its genetic regulation is not yet fully characterized. Further studies on both, the model eudicots and grasses, are needed to unravel this topic. This review provides general overview of genetic model of flower organ identity specification in monocots and it's miRNA-mediated regulation.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Micromorphology of nectaries of Rhododendron catawbiense Michx. at different flower development stages
Mikromorfologia nektarnikow Rhododendron catawbiense Michx. w roznych fazach rozwoju kwiatu
Autorzy:: Weryszko-Chmielewska, E
Chwil, M.
Michonska, M.
Tematy:: nectary size
different stage
epidermis
stoma
nectary
botany
development stage
Rhododendron catawbiense
micromorphology
flower development
cuticle; Pokaż więcej
Wydawca:: Polskie Towarzystwo Botaniczne
Powiązania:: https://bibliotekanauki.pl/articles/28637.pdf Link otwiera się w nowym oknie
Opis:: The analysis of the structure of floral nectaries of Rhododendron catawbiense Michx. was performed using stereoscopic, light and scanning electron microscopy. Nectaries were sampled at different development stages: closed bud, budburst and full bloom. The nectary gland exhibits clear ribbings corresponding to five small ribs of the ovary. In the top part of the gland, unicellular and multicellular non-glandular trichomes occur in great density. The upper surface of the nectary differs from its lateral surface by a stronger degree of cuticle development. Stomata are evenly distributed on the upper surface and in the higher regions of the lateral wall. The cuticle forms clear striae on the surface of stomatal cells. Stomata at different development stages were observed, as well as the beginning of nectar secretion which takes places already in the closed bud.
Analizy budowy nektarników kwiatowych Rhododendron catawbiense Michx. wykonano przy zastosowaniu mikroskopu: stereoskopowego, świetlnego i skaningowego elektronowego. Nektarniki pobierano w różnych fazach rozwoju: zamkniętego pąka, pękającego pąka i w pełni kwitnienia. Gruczoł nektarnikowy wykazuje wyraźne żebrowania odpowiadające pięciu niewielkim żebrom zalążni słupka. W szczytowej części gruczołu wyrastają jedno- i wielokomórkowe włoski mechaniczne występujące w dużym zagęszczeniu. Górna powierzchnia nektarnika różni się silniejszym stopniem rozwoju kutykuli od powierzchni bocznej. Aparaty szparkowe rozmieszczone są równomiernie na górnej powierzchni i w wyższych strefach bocznej ściany. Na powierzchni komórek szparkowych kutykula tworzy wyraźne prążki. Obserwowano aparaty szparkowe w różnych stadiach rozwoju oraz początek sekrecji nektaru, który odbywa się już w zamkniętym pąku.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of environmental factors on reproduction of polar vascular plants
Autorzy:: Kellmann-Sopyla, W.
Pastorczyk, M.
Gielwanowska, I.
Tematy:: environmental factor
plant reproduction
polar plant
vascular plant
climate change
generative reproduction
warming
flower development
seed formation
air temperature
ultraviolet radiation
reproductive phase
vegetation; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/11942.pdf Link otwiera się w nowym oknie
Opis:: In the last few decades, changes of reproductive pattern of polar vascular plants have been observed, for the benefit of generative propagation. The reasons for this phenomenon are attributed to intensively following climate change, whose effects may be various. Warming causes the production of the greater number of generative structures, with higher quality. Our macroscopic observations conducted on specimens of polar vascular plants, cultivated in University of Warmia and Mazury greenhouse, indicate that the effect of temperature increase on flower development and seed formation is inconsistent. On the other hand enhanced levels of UV-B radiation can negatively affect seedlings. The complexity of the climate change causes tremendous difficulties in defining a clear and unquestioned way of modifications during the reproductive phase of the described plants.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The correlation between size of Beta vulgaris L. flower buds and the stadium of pollen grains development
Autorzy:: Gapinska, M.
Glinska, S.
Michlewska, S.
Tematy:: conference
Beta vulgaris
flower bud
pollen grain
pollen development
androgenesis
inflorescence
light microscopy; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/81019.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Geometric parameters of the apical meristem and the quality of phyllotactic patterns in Magnolia flowers
Autorzy:: Wiss, D.
Zagorska-Marek, B.
Tematy:: geometrical parameter
apical meristem
quality
phyllotactic pattern
Magnolia
flower
phyllotaxis
plant development
primordium
meristem; Pokaż więcej
Wydawca:: Polskie Towarzystwo Botaniczne
Powiązania:: https://bibliotekanauki.pl/articles/56546.pdf Link otwiera się w nowym oknie
Opis:: The ratio of primordium size to the meristem size (P/M ratio) is regarded by some geometrical models of phyllotaxis as the parameter, which determines the quality of spiral and whorled patterns of lateral organ arrangement. This assumption was tested on floral meristems in four genets representing four Magnolia taxa: M. × salicifolia, M. stellata, M. denudata and M. acuminata. In successive zones of Magnolia flower, lateral organs are initiated in specific phyllotactic patterns and at specific values of the meristem and primordia sizes. The elements of perianth, usually positioned in three trimerous whorls, are initiated as large primordia on relatively small meristem. The switch in the identity of primordia, from tepals to stamens is accompanied by an abrupt increase in the size of the meristem and decrease in the primordia size. Small values of P/M ratio and frequent occurrence of qualitative transformations of phyllotaxis contribute to the exceptionally rich spectrum of spiral patterns in androecium zone. New spiral patterns emerge when bigger primordia of carpels are initiated on the meristem, which at the same time starts diminishing in size either abruptly (M. × salicifolia, M. stellata, M. acuminata) or slowly (M. denudata). Spiral patterns identified in gynoecia have lower numbers of parastichies than the patterns of androecia and occur in frequencies specific for the genet. Although noted ranges of the meristem and primordia sizes, justify the occurrence of phyllotactic patterns observed in successive zones of Magnolia flower, they do not explain genet-specific frequencies of the patterns observed in gynoecium zone. The lack of straightforward relationship between frequency of the patterns and P/M ratio in gynoecium suggests that more complex geometrical factors or factors of non-geometrical nature are engaged in determination of Magnolia floral phyllotaxis.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The structure of the ovule of Sida hermaphrodita (L.) Rusby after pollination
Struktura anatomiczna zalążka Sida hermaphrodita (L.) Rusby po zapyleniu
Autorzy:: Chudzik, B.
Szczuka, E.
Domaciuk, M.
Pavlov, D.
Tematy:: ovule
ovule structure
Sida hermaphrodita
pollination
flower
energetic plant
arabinogalactan protein
Malvaceae
protein distribution
development stage; Pokaż więcej
Wydawca:: Polskie Towarzystwo Botaniczne
Powiązania:: https://bibliotekanauki.pl/articles/26672.pdf Link otwiera się w nowym oknie
Opis:: The anatomical structure and the distribution of arabinogalactan proteins were investigated in the ovule of an energetic plant Sida hermaphrodita (L.) Rusby after pollination. Material was collected from an experimental field of the University of Life Sciences in Lublin (Felin). After embedding for immunoflurescence, semi-thin sections were stained with toluidine blue or incubated with JIM 13 or MAC 207 monoclonal antibodies for immunolabeling of arabinogalactan proteins. The structure of the ovule showed some differences in comparison to other representatives of the Malvaceae family. Conversely, the distribution of arabinogalactan proteins did not differ significantly from their distribution in the ovules of other angiosperms at the investigated stage of development.
Dostawca treści:: Biblioteka Nauki

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