Papers 9069
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#1Bartosz J. Płachno (Jagiellonian University)H-Index: 15
#2Małgorzata Stpiczyńska (University of Warsaw)H-Index: 16
Last.Vitor F. O. Miranda (UNESP: Sao Paulo State University)H-Index: 8
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Utricularia (Lentibulariaceae) is a genus comprising around 240 species of herbaceous, carnivorous plants. Utricularia is usually viewed as an insect-pollinated genus, with the exception of a few bird-pollinated species. The bladderworts Utricularia multifida and U. tenella are interesting species because they represent an early evolutionary Utricularia branch and have some unusual morphological characters in their traps and calyx. Thus, our aims were to (i) determine whether the nectar sugar co...
1 CitationsSource
#1Ying Miao (NWAFU: Northwest A&F University)H-Index: 1
#2Bing-Peng Liu (NWAFU: Northwest A&F University)H-Index: 1
Last.Bao-Zhen Hua (NWAFU: Northwest A&F University)H-Index: 1
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The structure of spermatozoa is able to provide valuable characters in resolving phylogenic relationships in Metazoa, especially in insects. Such data, however, are greatly deficient in Mecoptera. Here, we studied the spermiogenesis and ultrastructure of sperm in the hangingfly Terrobittacus implicatus (Huang and Hua) using transmission electron microscopy. The results show that the spermatogenesis of T. implicatus occurs within sperm cysts, following a pattern commonly found in insects. The mic...
1 CitationsSource
#1Alexey Eremin (Otto-von-Guericke University Magdeburg)H-Index: 21
#2Alexander A. Bulychev (MSU: Moscow State University)H-Index: 22
Last.Ilse Foissner (University of Salzburg)H-Index: 15
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Characean internodal cells develop alternating patterns of acid and alkaline zones along their surface in order to facilitate uptake of carbon required for photosynthesis. In this study, we used a pH-indicating membrane dye, 4-heptadecylumbiliferone, to study the kinetics of alkaline band formation and decomposition. The differences in growth/decay kinetics suggested that growth occurred as an active, autocatalytic process, whereas decomposition was due to diffusion. We further investigated mutu...
#1Isabella Veríssimo Nader Haddad (UFRJ: Federal University of Rio de Janeiro)H-Index: 2
#2Bárbara de Sá-Haiad (UFRJ: Federal University of Rio de Janeiro)H-Index: 3
Last.Silvia Rodrigues Machado (UNESP: Sao Paulo State University)H-Index: 20
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Reproduction in flowering plants is closely related to the megagametophyte, since the megagametophyte is involved in pollen tube reception and contains the two female gametes—egg cell and central cell. Previous conventional light microscopy methods have shown that female sterility in perfect flowers of Maytenus obtusifolia is associated with the occurrence of sterile ovules whose megagametophytes have hypertrophied synergids. Here, using transmission electron microscopy and cytochemical methods,...
#1Sérgio Heitor Sousa Felipe (UFV: Universidade Federal de Viçosa)H-Index: 3
Last.Wagner Campos Otoni (UFV: Universidade Federal de Viçosa)H-Index: 28
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Ultraviolet-B (UV-B) radiation is an elicitor of secondary metabolites in plant tissue culture, but the effects on 20-hydroxyecdysone (20E) are still unclear. The 20E may show biotechnological, pharmacological, medical, and agrochemical applicability. Here, we use Pfaffia glomerata, a medically important species, to understand the impacts of UV-B radiation on their physiological performance, the expression of key genes involved in the 20E biosynthesis, and the 20E content. Two accessions (A22 an...
#1Rosa Angelica Elias (UFSC: Universidade Federal de Santa Catarina)
#2Ana Paula Lando (UFSC: Universidade Federal de Santa Catarina)H-Index: 2
Last.Neusa Steiner (UFSC: Universidade Federal de Santa Catarina)H-Index: 13
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This is the first study to describe in a timescale morphohistological and ultrastructural characteristics of fruit (cypsela) and seed development in Trichocline catharinensis, which was completed 21 days after anthesis (DAA). At anthesis, we identified an ovary with three differentiated regions, including the inner epidermis, inner part, and outer epidermis. The mature ovule showed an integument with the outer epidermis, integumentary parenchyma, and endothelium. Cells around the endothelium for...
#1Ye Guo (UMN: University of Minnesota)H-Index: 1
#2Xiang Li (UMN: University of Minnesota)H-Index: 1
Last.Yingyue Li (UMN: University of Minnesota)H-Index: 1
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Jujube (Ziziphus jujuba Mill.) is an important fruit tree species in China. In this study, we studied the megasporogenesis, microsporogenesis, and female and male gametophyte development of two major jujube cultivars, “Dongzao” and “Mayazao,” using the squash technique, improved paraffin section technology, and optical microscopy. Our investigation revealed that both “Dongzao” and “Mayazao” have bilocular ovaries, basal placenta, and anatropous, bitegmic, crassinucellate ovules. The tetrads form...
1 CitationsSource
#1Mariusz K. Jaglarz (Jagiellonian University)H-Index: 11
#2Waclaw Tworzydlo (Jagiellonian University)H-Index: 11
Last.Szczepan M. Bilinski (Jagiellonian University)H-Index: 24
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Earwigs (Dermaptera) use different strategies to increase their reproductive success. Most species lay eggs; however, viviparity of the matrotrophic type has been reported in two groups: Hemimeridae and Arixeniidae. In Arixeniidae, offspring develop in two separate places: inside an ovary (the intraovarian phase) and within a uterus (the intrauterine phase). Both morphological and physiological aspects of viviparity in Arixeniidae have begun to be unraveled only recently. Here, we characterize h...
1 CitationsSource
#1Anna Michalik (Jagiellonian University)H-Index: 11
#2Katarzyna Michalik (Jagiellonian University)H-Index: 3
Last.Teresa Szklarzewicz (Jagiellonian University)H-Index: 16
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Mealybugs (Hemiptera, Coccomorpha: Pseudococcidae) are plant sap-sucking insects which require close association with nutritional microorganisms for their proper development and reproduction. Here, we present the results of histological, ultrastructural, and molecular analyses of symbiotic systems of six mealybugs belonging to the Phenacoccinae subfamily: Phenacoccus aceris, Rhodania porifera, Coccura comari, Mirococcus clarus, Peliococcus calluneti, and Ceroputo pilosellae. Molecular analyses b...
#1Marcelo P. Hernández (UNLP: National University of La Plata)H-Index: 4
#2Liliana Katinas (UNLP: National University of La Plata)H-Index: 4
The histochemical studies that search for osmophores differ in the protocol they follow for fixation and discoloration of the samples, and also in the type and number of stains utilized. Despite these differences, all the studies have one point in common: the use of fresh material either collected directly in the field or cultivated in botanical gardens and greenhouses. This is an obvious limitation for the studies of osmophores. Flower parts of herbarium specimens of different dates of collecti...
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Cell biology