Studies on the Mechanism of Aluminum Tolerance in Pea (Pisum sativum L.) Using Aluminum-Tolerant Cultivar 'Alaska' and Aluminum-Sensitive Cultivar 'Hyogo'(Plant Nutrition)

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概要

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• The mechanism of aluminum (Al) tolerance was investigated in an Al-tolerant cultivar (Alaska) and an Al-sensitive cultivar (Hyogo) of pea (Pisum sativum L.) seedlings. Al sensitivity was evaluated as the degree of root elongation inhibition in a calcium solution. Fifty percent inhibition of the elongation was observed after 24-h treatment with 5 μм Al in Alaska and with less than 2.5 μм Al in Hyogo. At 10 μм Al, both cultivars exhibited more than 70% inhibition. At 2.5 μм and 5 μм, Al triggered citrate secretion in both cultivars to the same extent, and the levels of Al accumulation in root apices were similar in both cultivars, indicating that the difference in Al tolerance observed in these cultivars was not related to the exclusion of Al with organic acid. Al treatment enhanced the production of reactive oxygen species (ROS) specifically in the elongation zone in both cultivars. Al dose and time course experiments indicated the existence of a strong positive correlation between the root elongation inhibition and ROS production in both cultivars. At 10 μм, Al inhibited the respiration rate in the root apex by 20% in Alaska and 30% in Hyogo but not significantly at lower concentrations. In the absence of Al, the ATP content in the root apex was 2 times higher in Alaska than in Hyogo. With the increase in Al concentration, the ATP content in Alaska decreased and reached the same level in Hyogo at 5 μм Al, while the ATP content in Hyogo did not change. These findings suggest that Al-triggered ROS production is a key factor for the root elongation inhibition in both cultivars, and the possible involvement of high ATP content in Alaska in the protection mechanism against ROS production and root elongation inhibition under Al stress.

• 社団法人日本土壌肥料学会の論文

著者

• Yamamoto Yoko

  Research Institute for Bioresources, Okayama University

• 山本 幸男

  Faculty Of Agriculture Kochi University

• 山本 幸男

  Research Institute For Bioresources Okayama University

• Yamamoto Y

  Okayama Univ.

• Yamamoto Yoko

  Research Institute For Bioresources Okayama University

• MATSUMOTO Hideaki

  Research Institute for Bioresources, Okayama University

• Yamamoto Y

  Department Of Biological Production Faculty Of Bioresource Sciences Akita Prefectural University

• Matsumoto Hideaki

  Res. Inst. Bioresources Okayama Univ.

• Matsumoto Hideaki

  Research Institute For Bioresources Okayama University

• Yamamoto Y

  Faculty Of Agriculture Kochi University

• Kobayashi Yukiko

  Research Institute for Bioresources, Okayama University

• Yamamoto Yoshinori

  Kochi Univ. Kochi Jpn

• Kobayashi Yukiko

  Research Institute For Bioresources Okayama University

• Matsumoto Hideaki

  Res. Inst. For Bioresources Okayama Univ.

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