callose/ضمور

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Cell number, cell growth, antheridiogenesis, and callose amount is reduced and atrophy induced by deoxyglucose in Anemia phyllitidis gametophytes.

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Fluorescence staining and morphometrical measurements revealed that callose was a component of newly formed cell plates of symmetrically dividing cells and asymmetrically dividing antheridial mother cells during gibberellic acid-induced antheridiogenesis as well as in walls of young growing cells of

Altered callose deposition during embryo sac formation of multi-pistil mutant (mp1) in Medicago sativa.

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Whether callose deposition is the cause or result of ovule sterility in Medicago sativa remains controversial, because it is unclear when and where changes in callose deposition and dissolution occur during fertile and sterile embryo sac formation. Here, alfalfa spontaneous multi-pistil mutant (mp1)

Relationship between male sterility and β-1,3-glucanase activity and callose deposition-related gene expression in wheat (Triticum aestivum L.).

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In previous studies, we first isolated one different protein β-1,3-glucanase using two-dimensional electrophoresis and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry from normal wheat (Triticum aestivum L.) and chemical hybridization agent-induced male sterility (CIMS)

Rice UDP-glucose pyrophosphorylase1 is essential for pollen callose deposition and its cosuppression results in a new type of thermosensitive genic male sterility.

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UDP-glucose pyrophosphorylase (UGPase) catalyzes the reversible production of glucose-1-phosphate and UTP to UDP-glucose and pyrophosphate. The rice (Oryza sativa) genome contains two homologous UGPase genes, Ugp1 and Ugp2. We report a functional characterization of rice Ugp1, which is expressed

Post-pollination callose development in ovules of Rhododendron and Ledum (Ericaceae): zygote special wall.

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In Rhododendron spp. and Ledum groenlandicum a callose wall is laid down around the zygote in the first 2 days after fertilization. The periodic acid/Schiff-positive, aniline blue-fluorescence-positive callosic wall is initiated adjacent to the degenerating synergid, extends to cover the entire

Callose in cell walls during megasporogenesis in angiosperms.

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Callose was detected by fluorescence microscopy in megasporogenesis in all investigated species with mono- and bisporic embryo-sac development. Callose occurs first in the meiotic prophase in the chalazal part of the megasporocyte wall and by the first meiotic metaphase the whole cell is enveloped

Callose (beta-1,3 glucan) is essential for Arabidopsis pollen wall patterning, but not tube growth.

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BACKGROUND Callose (beta-1,3 glucan) separates developing pollen grains, preventing their underlying walls (exine) from fusing. The pollen tubes that transport sperm to female gametes also contain callose, both in their walls as well as in the plugs that segment growing tubes. Mutations in CalS5,

Callose synthase (CalS5) is required for exine formation during microgametogenesis and for pollen viability in Arabidopsis.

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Callose (beta-1,3-glucan) is produced at different locations in response to biotic and abiotic cues. Arabidopsis contains 12 genes encoding callose synthase (CalS). We demonstrate that one of these genes, CalS5, encodes a callose synthase which is responsible for the synthesis of callose deposited

A rice β-1,3-glucanase gene Osg1 is required for callose degradation in pollen development.

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Plant β-1,3-glucanases are involved in plant defense and development. In rice (Oryza sativa), 14 genes encoding putative β-1,3-glucanases have been isolated and sequenced. However, only limited information is available on the function of these β-1,3-glucanase genes. In this study, we report a

Transcription factor AtMYB103 is required for anther development by regulating tapetum development, callose dissolution and exine formation in Arabidopsis.

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Downregulation of the transcription factor AtMYB103 using transgenic technology results in early tapetal degeneration and pollen aberration during anther development in Arabidopsis thaliana. This paper describes the functional analysis of the AtMYB103 gene in three knock-out mutants. Two male

The Arabidopsis CALLOSE DEFECTIVE MICROSPORE1 gene is required for male fertility through regulating callose metabolism during microsporogenesis.

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During angiosperm microsporogenesis, callose serves as a temporary wall to separate microsporocytes and newly formed microspores in the tetrad. Abnormal callose deposition and dissolution can lead to degeneration of developing microspores. However, genes and their regulation in callose metabolism

An original mutation in soybean (Glycine max (L.) Merrill) involving degeneration of the generative cell and causing male sterility.

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A spontaneous mutation causing male sterility has been detected in line BR97-17739 from the soybean breeding program conducted by Embrapa-National Soybean Research Center. Meiotic division and male gametophyte development were analyzed in 10 male-sterile, female-fertile plants. Meiotic process had

Time relationships of sporopollenin synthesis associated with tapetum and microspores in Lilium.

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The development of the sporopollenin orbicules (Ubisch bodies) on the tapetal cells of Lilium begins while the spores are still enclosed in the meiotic tetrads. Spherosome-like structures, the pro-orbicular bodies, accumulate in the vicinity of the plasmalemma early in the tetrad period, and are

Death of female flower microsporocytes progresses independently of meiosis-like process and can be accelerated by specific transcripts in Asparagus officinalis.

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Asparagus officinalis (garden asparagus) is a dioecious perennial crop, and the dioecy (i.e., sex) of A. officinalis can affect its productivity. In A. officinalis, flower anthers in female plants fail to accumulate callose around microsporocytes, fail to complete meiosis, and degenerate due to cell

Physiological, anatomical and biomass partitioning responses to ozone in the Mediterranean endemic plant Lamottea dianae.

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Ozone effects on the perennial forb Lamottea dianae were studied in an open-top chamber experiment. Ozone was found to induce reductions in CO₂ assimilation and water use efficiency in the leaves of this species. These reductions were mainly related to a decline in the in vivo CO₂ fixation capacity

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