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Plant Physiol, August 2000, Vol. 123, pp. 1537-1544
Pattern of Aluminum-Induced Secretion of Organic Acids Differs
between Rye and Wheat1
Xiao Feng
Li,
Jian Feng
Ma, and
Hideaki
Matsumoto*
Research Institute for Bioresources, Okayama University, Chuo
2-20-1, Kurashiki 710-0046, Japan (X.F.L., H.M.); Faculty
of Agriculture, Kagawa University, Ikenobe 2393, Miki-cho, Kita-gun,
Kagawa 761-0795, Japan (J.F.M.); and Agriculture College,
Guangxi University, Xixingtang 10, Nangning, Guangxi 530005, People's
Republic of China (X.F.L.)
Al-Induced secretion of organic acids from the roots has been
considered as a mechanism of Al tolerance, but the processes leading to
the secretion of organic acids are still unknown. In this study, the
secretion pattern and alteration in the metabolism of organic acids
under Al stress were examined in rye (Secale cereale L. cv King) and wheat (Triticum aestivum L. cv Atlas 66). Al induced rapid secretion of malate in the wheat, but a lag (6 and
10 h for malic and citric acids, respectively) between the exposure to Al and the secretion of organic acids was observed in the
rye. The activities of isocitrate dehydrogenase,
phosphoenolpyruvate carboxylase, and malate
dehydrogenase were not affected by Al in either plant. The activity of
citrate synthase was increased by the exposure to Al in the rye, but
not in the wheat. The secretion of malate was not suppressed at low
temperature in the wheat, but that of citrate was stopped in the rye.
The Al-induced secretion of citrate from roots of the rye was inhibited
by the inhibitors of a citrate carrier, which transports citrate from
the mitochondria to the cytoplasm. All of these results suggest that
alteration in the metabolism of organic acids is involved in the
Al-induced secretion of organic acids in rye, but only activation of an
anion channel seems to be responsible for the rapid secretion of malate in the wheat.
1
This study was supported in part by the Program
for Promotion of Basic Research Activities for Innovative Bioresources,
by a Grant-in-Aid for Encouragement of Young Scientists (grant no. 09760058 to J.F.M.) from the Ministry of Education, Science, Sports and
Culture of Japan, by the Agriculture Science and Education Foundation,
by Grants-in-Aid for General Scientific Research (A and B) (nos.
09460038 and 11306006) from the Ministry of Education, Science, Sports
and Culture of Japan, by the Joint Research Project Program under the
Japan-Korea, Basic Scientific Cooperation Program, by the Research for
the Future Program from Japan Society for the Promotion of Science, and
by the Ohara Foundation for Agricultural Science.
*
Corresponding author; e-mail hmatsumo{at}rib.okayama-u.ac.jp; fax
81-86-434-1210.
© 2000 American Society of Plant Physiologists
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