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Published on June 18, 2008; 10.1104/pp.108.118778

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Received March 6, 2008
Accepted June 10, 2008

Mutation of the Rice NARROW LEAF1 Gene, Which Encodes a Novel Protein, Affects Vein Patterning and Polar Auxin Transport

Jing Qi , Qian Qian , Qingyun Bu , Shuyu Li , Qian Chen , Jiaqiang Sun , Wenxing Liang , Yihua Zhou , Chengcai Chu , Xugang Li , Fugang Ren , Klaus Palme , Bingran Zhao , Jinfeng Chen , Mingsheng Chen , and Chuanyou Li *

State Key Laboratory of Plant Genomics, National Centre for Plant Gene Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Datun Road, Beijing 100101, China; State Key Laboratory of Rice Biology, China National Rice Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou 310006, China; Graduate School of Chinese Academy of Sciences, Beijing, China; Institut fur Biologie II und Zentrum fur Angewandte Biowissenschaften, Universitat Freiburg, D-79104 Freiburg, Germany; China National Hybrid Rice R & D Center, Changsha 410125, China

* Corresponding author; email: cyli{at}genetics.ac.cn.

The size and shape of plant leaf is an important agronomic trait. In order to understand the molecular mechanism governing plant leaf shape, we characterized a classic rice (Oryza sativa) dwarf mutant named narrow leaf1 (nal1), which exhibits a characteristic phenotype of narrow leaves. In accordance with reduced leaf blade width, leaves of nal1 contain decreased number of longitudinal veins. Anatomical investigations revealed that the culms of nal1 also show defective vascular system, in which the number and distribution pattern of vascular bundles are altered. Map-based cloning and genetic complementation analyses demonstrated that Nal1 encodes a plant specific protein with unknown biochemical function. We provided evidence showing that Nal1 is richly expressed in vascular tissues and that mutation of this gene leads to significantly reduced polar auxin transport capacity. These results indicated that Nal1 affects polar auxin transport as well as vascular patterns of rice plants and plays an important role in the control of lateral leaf growth.






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