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    Cell membrane integrity, callose accumulation, and root growth in aluminum-stressed sorghum seedlings

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    Biologia planturum-sept 2014.pdf (615.0Kb)
    Date
    2015-08-19
    Author
    Gudu, Samuel
    Onkware, Augustino
    Emily Jepkosgei Too
    Beatrice Ang’iyo Were
    Anders S. Carlsson
    Mulatu Geleta
    T. Bryngelsson
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    Abstract
    Aluminum stress usually reduces plant root growth due to the accumulation of Al in specific zones of the root apex. The objectives of this study were to determine the localization of Al in the root apex of Sorghum bicolor (L.) Moech. and its effects on membrane integrity, callose accumulation, and root growth in selected cultivars. Seedlings were grown in a nutrient solution containing 0, 27, or 39 μM Al3+ for 24, 48, and 120 h. The Al stress significantly reduced root growth, especially after 48 and 120 h of exposure. A higher Al accumulation, determined by fluorescence microscopy after staining with a Morin dye, occurred in the root extension zone of the sensitive cultivar than in the tolerant cultivar. The membrane damage and callose accumulation were also higher in the sensitive than resistant cultivar. It was concluded that the Al stress significantly reduced root growth through the accumulation of Al in the root extension zone, callose accumulation, and impairment of plasma membrane integrity.
    URI
    http://repository.rongovarsity.ac.ke/handle/123456789/428
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