Idioblast
Mostrando 1-11 de 11 artigos, teses e dissertações.
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1. Floral glands in asclepiads: structure, diversity and evolution
ABSTRACT Species of Apocynaceae stand out among angiosperms in having very complex flowers, especially those of asclepiads, which belong to the most derived subfamily (Asclepiadoideae). These flowers are known to represent the highest degree of floral synorganization of the eudicots, and are comparable only to orchids. This morphological complexity may also
Acta Bot. Bras.. Publicado em: 2017-09
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2. Características anatômicas, histoquímica das estruturas secretoras e ontogenia de idioblastos da folha de Pothomorphe umbellata (L.) Miq. (Piperaceae) / Anatomical characteristics, histochemistry of the secretory structures and ontogeny of idioblasts on the leaf of Pothomorphe umbellata (L.) Miq. (Piperaceae)
Pothomorphe umbellata, commonly known as pariparoba or capeba, occurs in humid environments and is used in almost entire Brazil due to its medicinal properties. The goals of this work were to understand the leaf anatomy of P. umbellata, to perform the histochemical characterization of the secretory structures present, and to describe the ontogeny of its secr
Publicado em: 2008
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3. Biosynthesis of l-Ascorbic Acid and Conversion of Carbons 1 and 2 of l-Ascorbic Acid to Oxalic Acid Occurs within Individual Calcium Oxalate Crystal Idioblasts1
l-Ascorbic acid (AsA) and its metabolic precursors give rise to oxalic acid (OxA) found in calcium oxalate crystals in specialized crystal idioblast cells in plants; however, it is not known if AsA and OxA are synthesized within the crystal idioblast cell or transported in from surrounding mesophyll cells. Isolated developing crystal idioblasts from Pis
American Society of Plant Physiologists.
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4. Calsequestrinlike calcium-binding protein is expressed in calcium-accumulating cells of Pistia stratiotes.
To contend with high calcium (Ca) levels in the environment, many plant species contain crystal idioblasts, specialized cells which accumulate large amounts of Ca as oxalate crystals. The biochemical processes involved in the accumulation of Ca in crystal idioblasts are unknown, as these cells constitute only a minor proportion of the total plant tissue. To
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5. Guard Cell- and Phloem Idioblast-Specific Expression of Thioglucoside Glucohydrolase 1 (Myrosinase) in Arabidopsis1
Thioglucoside glucohydrolase 1 (TGG1) is one of two known functional myrosinase enzymes in Arabidopsis. The enzyme catalyzes the hydrolysis of glucosinolates into compounds that are toxic to various microbes and herbivores. Transgenic Arabidopsis plants carrying β-glucuronidase and green fluorescent protein reporter genes fused to 0.5 or 2.5 kb of the TGG1
American Society of Plant Physiologists.
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6. Differential targeting of the tobacco PR-1 pathogenesis-related proteins to the extracellular space and vacuoles of crystal idioblasts.
Several biochemical and localization studies have shown that the acidic isoforms of the tobacco pathogenesis-related (PR) proteins, PR-1a, -1b and -1c are secreted to the extracellular spaces of leaves in response to pathogen infection or chemical treatment. Here we report the differential accumulation of these proteins within the vacuoles of specialized cel
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7. Differential Expression and Turnover of the Tomato Polyphenol Oxidase Gene Family during Vegetative and Reproductive Development.
Polyphenol oxidases (PPOs) are encoded by a highly conserved, seven-member gene family clustered within a 165-kb locus on chromosome 8 of tomato (Lycopersicon esculentum). Using gene-specific probes capable of differentiating between PPO A/C, PPO B, PPO D, and PPO E/F, we examined the spatial and temporal expression of this gene family during vegetative and
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8. Multicellular compartmentation of catharanthus roseus alkaloid biosynthesis predicts intercellular translocation of a pathway intermediate
In situ RNA hybridization and immunocytochemistry were used to establish the cellular distribution of monoterpenoid indole alkaloid biosynthesis in Madagascar periwinkle (Catharanthus roseus). Tryptophan decarboxylase (TDC) and strictosidine synthase (STR1), which are involved in the biosynthesis of the central intermediate strictosidine, and desacetoxyvindo
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9. Different Myrosinase and Idioblast Distribution in Arabidopsis and Brassica napus1
Myrosinase (EC 3.2.3.1) is a glucosinolate-degrading enzyme mainly found in special idioblasts, myrosin cells, in Brassicaceae. This two-component system of secondary products and degradative enzymes is important in plant-insect interactions. Immunocytochemical analysis of Arabidopsis localized myrosinase exclusively to myrosin cells in the phloem parenchyma
American Society of Plant Physiologists.
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10. Processes Modulating Calcium Distribution in Citrus Leaves. An Investigation Using X-Ray Microanalysis with Strontium as a Tracer
Citrus leaves accumulate large amounts of calcium that must be compartmented effectively to prevent stomatal closure by extracellular Ca2+ and interference with Ca2+-based cell signaling pathways. Using x-ray microanalysis, the distribution of calcium between vacuoles in different cell types of leaves of rough lemon (Citrus jambhiri Lush.) was investigated.
American Society of Plant Biologists.
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11. Molecular and Biochemical Analysis of a Madagascar Periwinkle Root-Specific Minovincinine-19-Hydroxy-O-Acetyltransferase1
The terminal steps in the biosynthesis of the monoterpenoid indole alkaloids vindoline and minovincinine are catalyzed by separate acetyl coenzyme A-dependent O-acetyltransferases in Madagascar periwinkle (Catharanthus roseus G. Don). Two genes were isolated that had 63% nucleic acid identity and whose deduced amino acid sequences were 78% identical. Ac
American Society of Plant Physiologists.