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Plant Physiol, October 1999, Vol. 121, pp. 399-410
The Starch-Debranching Enzymes Isoamylase and Pullulanase Are
Both Involved in Amylopectin Biosynthesis in Rice
Endosperm1
Akiko
Kubo,
Naoko
Fujita,2
Kyuya
Harada,
Toshiaki
Matsuda,
Hikaru
Satoh, and
Yasunori
Nakamura*
National Institute of Agrobiological Resources, Kannondai, Tsukuba,
Ibaraki 305-8602, Japan (A.K., N.F., Y.N.); Department of
Horticulture, Chiba University, Matsudo, Chiba 271-8510, Japan (A.K.,
K.H.); School of Agriculture, Ibaraki University, Ami, Tsuchiura,
Ibaraki 300-0393, Japan (T.M.); and Faculty of Agriculture, Kyushu
University, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan (H.S.)
The activities of the two types of
starch debranching enzymes, isoamylase and pullulanase, were greatly
reduced in endosperms of allelic sugary-1 mutants of
rice (Oryza sativa), with the decrease more pronounced
for isoamylase than for pullulanase. However, the decrease in
isoamylase activity was not related to the magnitude of the
sugary phenotype (the proportion of the phytoglycogen
region of the endosperm), as observed with pullulanase. In the
moderately mutated line EM-5, the pullulanase activity was markedly
lower in the phytoglycogen region than in the starch region, and
isoamylase activity was extremely low or completely lost in the whole
endosperm tissue. These results suggest that both debranching enzymes
are involved in amylopectin biosynthesis in rice endosperm. We presume that isoamylase plays a predominant role in amylopectin synthesis, but
pullulanase is also essential or can compensate for the role of
isoamylase in the construction of the amylopectin multiple-cluster structure. It is highly possible that isoamylase was modified in some
sugary-1 mutants such as EM-273 and EM-5, since it was present in significant and trace amounts, respectively, in these mutants but was apparently inactive. The results show that the Sugary-1 gene encodes the isoamylase gene of the rice genome.
1
This work was supported by grants from Special
Coordination Funds for Promoting Science and Technology, The
Enhancement of Center-of-Excellence Program, Japan, and from the
Ministry of Agriculture, Forestry and Fisheries, Japan.
2
Present address: Department of Bio-Production
Science, Akita Prefectural University, Akita, Akita 010-0146, Japan.
*
Corresponding author; e-mail nakayn{at}abr.affrc.go.jp; fax
81-298-38-8347.
© 1999 American Society of Plant Physiologists
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