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Ethylene Synthesis and Auxin Augmentation in Pistil Tissues are Important for Egg Cell Differentiation after Pollination in Maize

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    SYSNO ASEP0107467
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JOstatní články
    TitleEthylene Synthesis and Auxin Augmentation in Pistil Tissues are Important for Egg Cell Differentiation after Pollination in Maize
    TitleTvorba etylénu a zvýšení auxinu v pletivu jsou důležité pro diferenciaci vaječné buňky po opylení u kukuřice
    Author(s) Mól, R. (PL)
    Filek, M. (PL)
    Macháčková, Ivana (UEB-Q)
    Rochon, E. (FR)
    Source TitlePlant and Cell Physiology. - : Oxford University Press - ISSN 0032-0781
    Roč. 45, č. 10 (2004), s. 1396-1405
    Number of pages10 s.
    Languageeng - English
    CountryJP - Japan
    Keywordsegg cell maturation ; growth regulators ; Maize
    Subject RIVEB - Genetics ; Molecular Biology
    R&D ProjectsKSK5052113 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
    AnnotationThe role of ethylene and auxin in stigma-to-ovule signalling was investigated in maize (Zea mays L.). Maturation of the egg cells in an ear was stimulated before actual fertilization by the application of fresh pollen grains or quartz sand to fully receptive stigmas. Ethylene emission by maize ears increased in response to those treatments. Silks and ovaries were involved in ethylene synthesis after pollen or sand was shed over the silks. The content of ethylene precursor [1-aminocyclopropane-1-carboxylic acid (ACC)] increased in both pistil parts soon after pollination. ACC rise was delayed by 4 h in the ovaries, and by 8 h in the silks after mock-pollination with sand. The auxin level increased rapidly in the silks and ovaries after pollination, and it was very high in the pollinated silks due to the high indole-3-acetic acid (IAA) content of pollen grains. IAA rise also appeared in the silks and ovaries after treatment with sand but it was delayed by 8 h. Application of ACC (10 µM) or IAA (6 µM) solutions to non-pollinated silks stimulated maturation of the egg cells. Moreover, the response of the egg cells to pollination was cancelled by L--(2-aminoethoxyvinyl)-glycine, -aminoisobutyric acid or 2,3,5-triiodobenzoic acid applied to the silks before pollination. Thus ethylene synthesis and polar auxin transport in the silks pollinated with fresh pollen were necessary to evoke accelerated differentiation of the egg cells in maize ovules. Differences in pistil responses found between true- and mock-pollination suggest that signalling pathways are at least partially different for the reception of pollen grains and sand crystals on maize stigma.
    WorkplaceInstitute of Experimental Botany
    ContactDavid Klier, knihovna@ueb.cas.cz, Tel.: 220 390 469
    Year of Publishing2005
Number of the records: 1  

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