Continuous secretion of organic acids is related to aluminium resistance during relatively long-term exposure to aluminium stress

Shao Jian Zheng, Jian Feng Ma, Hideaki Matsumoto

Research output: Contribution to journalArticle

82 Citations (Scopus)

Abstract

Secretion of organic acid has been suggested to be one of the mechanisms for Al resistance in short-term experiments. In the present study, relatively long-term response of roots to Al stress was investigated in terms of organic acid secretion. Eight plant cultivars belonging to 5 species that exhibited differential sensitivity to Al were used. Ten days of intermittent exposure to Al (one day in 0.5 mM CaCl2 containing 50 μM AlCl3 at pH 4.5, alternating with one day in nutrient solution without Al) inhibited root growth by 65% in an Al-sensitive cultivar of wheat (Triticum aestivum L. Scout 66) and by 25-50% in two cultivars of oilseed rape (Brassica napus L. 94008 and H166), two cultivars of oat (Arena sativa L. Tochiyutaka and Heoats), and an Al-tolerant cultivar of wheat (Atlas 66). However, root growth was hardly affected by the same treatment in buckwheat (Fagopyrum esculentum Moench Jianxi) and radish (Raphanus sativus L. Guangxi). Organic acids were monitored during the first 6 h of each day of Al treatment, and both the kind and amount of organic acids secreted were found to differ among different species. Roots of buckwheat secreted oxalic acid, those of wheat exuded malic acid, while those of rapeseed, oats, and radish secreted both citric and malic acids. Three different patterns in response to relatively long-term treatment of Al were found in terms of total amount of organic acids secreted: (1) the amount secreted was very low during the treatment (wheat cv. Scout 66, oat), (2) the amount gradually decreased with duration of treatment (wheat cv. Atlas 66, oilseed rape), and (3) the amount maintained at a high level during the whole period of Al treatment (buckwheat and radish). Combined with the results of growth inhibition, it is suggested that the continuous secretion of organic acids at a high level is related to high Al resistance.

Original languageEnglish
Pages (from-to)209-214
Number of pages6
JournalPhysiologia Plantarum
Volume103
Issue number2
DOIs
Publication statusPublished - 1998

Fingerprint

chronic exposure
Aluminum
Fagopyrum
Triticum
organic acids and salts
aluminum
Raphanus
secretion
Acids
buckwheat
radishes
wheat
Brassica napus
cultivars
oats
Atlases
malic acid
root growth
Growth
Oxalic Acid

Keywords

  • Aluminium stress
  • Organic acids
  • Plant species
  • Relatively long-term response
  • Resistance
  • Secretion

ASJC Scopus subject areas

  • Plant Science

Cite this

Continuous secretion of organic acids is related to aluminium resistance during relatively long-term exposure to aluminium stress. / Zheng, Shao Jian; Ma, Jian Feng; Matsumoto, Hideaki.

In: Physiologia Plantarum, Vol. 103, No. 2, 1998, p. 209-214.

Research output: Contribution to journalArticle

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abstract = "Secretion of organic acid has been suggested to be one of the mechanisms for Al resistance in short-term experiments. In the present study, relatively long-term response of roots to Al stress was investigated in terms of organic acid secretion. Eight plant cultivars belonging to 5 species that exhibited differential sensitivity to Al were used. Ten days of intermittent exposure to Al (one day in 0.5 mM CaCl2 containing 50 μM AlCl3 at pH 4.5, alternating with one day in nutrient solution without Al) inhibited root growth by 65{\%} in an Al-sensitive cultivar of wheat (Triticum aestivum L. Scout 66) and by 25-50{\%} in two cultivars of oilseed rape (Brassica napus L. 94008 and H166), two cultivars of oat (Arena sativa L. Tochiyutaka and Heoats), and an Al-tolerant cultivar of wheat (Atlas 66). However, root growth was hardly affected by the same treatment in buckwheat (Fagopyrum esculentum Moench Jianxi) and radish (Raphanus sativus L. Guangxi). Organic acids were monitored during the first 6 h of each day of Al treatment, and both the kind and amount of organic acids secreted were found to differ among different species. Roots of buckwheat secreted oxalic acid, those of wheat exuded malic acid, while those of rapeseed, oats, and radish secreted both citric and malic acids. Three different patterns in response to relatively long-term treatment of Al were found in terms of total amount of organic acids secreted: (1) the amount secreted was very low during the treatment (wheat cv. Scout 66, oat), (2) the amount gradually decreased with duration of treatment (wheat cv. Atlas 66, oilseed rape), and (3) the amount maintained at a high level during the whole period of Al treatment (buckwheat and radish). Combined with the results of growth inhibition, it is suggested that the continuous secretion of organic acids at a high level is related to high Al resistance.",
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