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Plant and Cell Physiology, 2000, Vol. 41, No. 11 1193-1199
© 2000 Oxford University Press

An Agravitropic Mutant of Arabidopsis, endodermal-amyloplast less 1, That Lacks Amyloplasts in Hypocotyl Endodermal Cell Layer

Kenichiro Fujihira1, Tetsuya Kurata1,3, Masaaki K. Watahiki1,4, Ichirou Karahara2 and Kotaro T. Yamamoto1,5

1 Division of Biological Science, Graduate School of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810 Japan 2 Department of Biology, Faculty of Science, Toyama University, Toyama, 930-8555 Japan

We have isolated a new recessive mutant of Arabidopsis thaliana for gravitropism, endodermal-amyloplast less1 (eal1). eal1 shows reduced gravitropism in hypocotyl, and completely lacks gravitropism in inflorescence stems; root gravitropism is not affected. Starch staining with I-KI solution reveals almost no amyloplasts in eal1 hypocotyls when grown on a sucrose-free medium, though the root columella cells contain as many amyloplasts as wild type. On a medium containing 1% sucrose, eal1 hypocotyls contain as many starch granules as those of wild type, suggesting that starch synthesis is not affected in eal1. The endodermal cell layer which is thought to function as statocytes in hypocotyls is present in eal1. These results suggest that differentiation or development of gravity-responsive amyloplasts are affected in eal1 hypocotyls.

3 Present address: Division of Biological Science, Graduate School of Science, Hokkaido University, Sapporo, 060-0810 Japan.

4 Present address: The University of Edinburgh, Division of Biological Sciences, Institute of Cell and Molecular Biology, Daniel Rutherford Building, Mayfield Road, Edinburgh EH9 3JH, U.K.

5 Corresponding author: E-mail, kty@ees.hokudai.ac.jp; Fax, +81-11-706-2253.


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