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Published on July 27, 2007; 10.1104/pp.107.102095

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Received May 9, 2007
Accepted July 16, 2007

A Sepal Expressed ADP-Glucose Pyrophosphorylase Gene (NtAGP) Is Required for Petal Expansion Growth in Nicotiana tabacum cv. Xanthi

Man Sup Kwak , Sung Ran Min , Si-Myung Lee , Kyung-Nam Kim , Jang Ryol Liu , Kyung-Hee Paek , Jeong Sheop Shin , and Jung Myung Bae *

School of Life Sciences and Biotechnology, Korea University, Seoul 136-701, Korea; Plant Genome Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 305-806, Korea; Biosafety Division, National Institute of Agricultural Biotechnology (NIAB), Rural Developmental Administration (RDA), Suwon 441-707, Korea; Department of Molecular Biology, Sejong University, Seoul, 136-747, Korea

* Corresponding author; email: jmbae{at}korea.ac.kr.

In this study, a tobacco (Nicotiana tabacum cv. ‘Xanthi’) ADP-glucose pyrophosphorylase (AGPase) cDNA (NtAGP) was isolated from a flower bud cDNA library and the role of NtAGP in the growth of the floral organ was characterized. The expression of NtAGP was high in the sepal, moderate in the carpel and stamen, and low in the petal tissues. NtAGP-antisense plants produced flowers with abnormal petal limbs due to the early termination of the expansion growth of the petal limbs between the corolla lobes. Microscopic observation of the limb region revealed that cell expansion was limited in NtAGP-antisense plants but that cell numbers remained unchanged. mRNA levels of NtAGP, AGPase activity, and starch content in the sepal tissues of NtAGP-antisense plants were reduced, resulting in significantly lower levels of sugars (sucrose, glucose, and fructose) in the petal limbs. The feeding of these sugars to flower buds of the NtAGP-antisense plants restored the expansion growth in the limb area between the corolla lobes. Expansion growth of the petal limb between the corolla lobes was severely arrested in ‘Xanthi’ flowers from which sepals were removed, indicating that sepal carbohydrates are essential for petal limb expansion growth. These results demonstrate that NtAGP plays a crucial role in the morphogenesis of petal limbs in ‘Xanthi’ through the synthesis of starch, which is the main carbohydrate source for expansion growth of petal limbs, in sepal tissues.






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