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Annals of Botany 88: 545-553, 2001
© 2001 Annals of Botany Company

Regulation of Chloroplast Gene Expression is Affected in ali, a Novel Tobacco Albino Mutant

Chang-Hyu Bae+, Tomoko Abe§, Tomoki Matsuyama, Nobuhisa Fukunishi, Noriko Nagata, Takeshi Nakano, Yasuko Kaneko, Kazumitsu Miyoshi, Hisashi Matsushima and Shigeo Yoshida

Plant Functions Lab., RIKEN (The Institute of Physical and Chemical Research), Wako 351-0198, Japan Beam Dynamics Division, RIKEN (The Institute of Physical and Chemical Research), Wako 351-0198, Japan Department of Regulation Biology, Faculty of Science, Saitama University, Urawa 338-8570, Japan Crop Science Lab., Faculty of Bioresource Sciences, Akita Pref. University, Akita 010-0146, Japan

Received: 13 February 2001 ; Returned for revision: 16 April 2001 . Accepted: 4 June 2001

An albino mutant designated ali was isolated from an M2population derived from a tobacco (Nicotiana tabacum L. ‘BY-4’) plant which had been irradiated with a14N-ion beam at an early stage of embryonic development. Leaf mesophyll cells of ali were devoid of developed chloroplasts, and no stacked thylakoid membranes could be detected in the plastids. The reduction of pigment and the arrest of chloroplast development in ali were associated with distinct alterations in gene expression. Expression of plastid-encoded genes for the photosynthesis system (rbcL, psbA) was greatly reduced in ali, but at the transcript level plastid-encoded genes for 23S rDNA and 16S rDNA expression were only slightly reduced. Transcription of the nuclear-encodedLhc and rbcS genes in the mutant was similar to that in the wild-type. There was no accumulation of Rubisco-L, Rubisco-S, and PSII-D1 polypeptides in the ali mutant. The number of chloroplasts per cell was similar in bothali and wild-type plants. These results suggest that ali is a novel albino mutant in which chloroplast gene expression is affected. Copyright 2001 Annals of Botany Company

Nicotiana tabacum L., albino, ion-beam, chloroplast gene, ultrastructure


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