Seed storage period reduces aluminum tolerance in rice (Oryza sativa)
In order to investigate the relationship between seed storage period and aluminum (Al) tolerance, two seed lots of an Al-tolerant rice cultivar (Caiapó), the first stored for 3 years and the second newly harvest, were exposed to AlCl3 solutions. The following parameters were analyzed: germination, relative root elongation (RRE) and Al accumulation in root and seed tissue using hematoxylin staining. The germination of the stored seed was inhibited and their seedlings showed a greater RRE inhibition and, also, a more intense Al concentration of the roots at Al 80μ M than those of newly harvested seeds. When exposed to 160μ M Al, no distinction was observed between seedlings from the seeds of different ages. After imbibition, Al was found on the seeds surface and in the inner tissues of the old rice seeds for all Al concentrations. In the new seeds, this fact was observed only at 160μ M Al, demonstrating that Al had permeated the seed coat into the outer endosperm, probably due to seed coat damage during storage. Seeds of both ages kept the same viability but this characteristic does not appear to be related to the Al-tolerance, since the Al tolerance limit was greater in the newly harvested seeds.
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Document Type: Research Article
Publication date: October 1, 2007
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