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 mu M 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.

Keywords

aluminum tolerance; root extension zone

Published in

Biologia Plantarum
2014, Volume: 58, number: 4, pages: 768-772

SLU Authors

• Carlsson, Anders

  • Department of Plant Breeding, Swedish University of Agricultural Sciences
    

• Dida, Mulatu Geleta

  • Department of Plant Breeding, Swedish University of Agricultural Sciences
    

• Bryngelsson, Tomas

  • Department of Plant Breeding, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Soil Science
Other Biological Topics


Publication identifier

DOI: https://doi.org/10.1007/s10535-014-0455-0

Permanent link to this page (URI)

https://res.slu.se/id/publ/66242