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Title of Journal: Plant Soil

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Abbravation: Plant and Soil

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Springer Netherlands

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DOI

10.1016/0362-546x(86)90134-3

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1573-5036

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Aluminum distribution and reactive oxygen species

Authors: Ko Tahara Takashi Yamanoshita Mariko Norisada Isao Hasegawa Hiroyuki Kashima Satohiko Sasaki Katsumi Kojima
Publish Date: 2008/04/12
Volume: 307, Issue: 1-2, Pages: 167-178
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Abstract

To elucidate the mechanism of the high aluminum Al resistance of a Myrtaceae tree Melaleuca cajuputi Powell we investigated the responses of root tips to Al and compared them with those of an Alsensitive species M bracteata F Muell Roots of seedlings of both species were treated with a calcium solution pH 40 containing 0 or 1 mM AlCl3 After 3 h of Al treatment inhibition of root elongation and deposition of callose and lignin in root tips typical signs of Al injury were induced in M bracteata but not in M cajuputi yet Al accumulation in root tips was similar in both species These results indicate that internal Al tolerance mechanisms not Al exclusion mechanisms are responsible for the Al resistance of M cajuputi After 3 h of Al treatment amount of Al tightly bound to root tips Al remaining after washing with a desorbing solution was less in M cajuputi than in M bracteata In M bracteata 6 h of Al treatment triggered the accumulation of hydrogen peroxide H2O2 in root tips despite the upregulation of antioxidant mechanisms activity of peroxidase and concentration of reduced glutathione In M cajuputi 6 h of Al treatment did not affect the concentration of H2O2 but decreased activity of peroxidase and increased concentration of reduced glutathione in root tips These results suggest that the less Al tightly bound to root tips is involved in the suppressing the H2O2 accumulation and the internal Al tolerance in M cajuputi and that the H2O2 accumulation or changes in cellular environment that bring about H2O2 accumulation despite the upregulation of antioxidant mechanisms results in Alinduced inhibition of root elongation in M bracteataThis study was supported by a GrantinAid for Scientific Research and a 21st Century Center of Excellence Program from the Ministry of Education Culture Sports Science and Technology of Japan and by the Global Environment Research Fund from the Ministry of the Environment of Japan

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