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AOBPreview originally published online on July 15, 2006
Annals of Botany 2006 98(3):537-543; doi:10.1093/aob/mcl144
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© The Author 2006. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

The Impact of Cell Division and Cell Enlargement on the Evolution of Fruit Size in Pyrus pyrifolia

CAIXI ZHANG1,2, KENJI TANABE2,*, SHIPING WANG1, FUMIO TAMURA2, AKIRA YOSHIDA3 and KAZUHIRO MATSUMOTO2

1 Department of Plant Science, College of Agriculture and Biology, Shanghai Jiaotong University, Shanghai 201101, China, 2 Laboratory of Horticultural Science, Faculty of Agriculture, Tottori University, Tottori 680-8533, Japan and 3 Tottori Horticultural Experiment Station, Tottori 689-2221, Japan

* For correspondence. E-mail tanabe{at}muses.tottori-u.ac.jp

Received: 15 April 2006    Returned for revision: 9 May 2006    Accepted: 30 May 2006    Published electronically: 15 July 2006

• Background and Aims Dramatic increases in fruit size have accompanied the domestication of Pyrus pyrifolia. To evaluate the contribution of cell division and cell enlargement in the evolution of fruit size, the following study was conducted.

• Methods Three wild Pyrus and 46 cultivated Pyrus pyrifolia cultivars were selected to examine cell number/size at time of pollination and at time of fruit harvest. The period of cell division was estimated by logarithmic curve of the increasing pattern of cell number, and its correlations with maturation period and final fruit size were analysed.

• Key Results Final fruit size is directly related to the number of cells produced in the period immediately following pollination. Late-maturing cultivars are larger than earlier-maturing cultivars and this is due to an extended period of cell division.

• Conclusions The evolution of fruit size in P. pyrifolia has mainly resulted from shifts in the ability of cells to divide rather than to enlarge.

Key words: Cell division, cell enlargement, fruit size, domestication, Pyrus pyrifolia, pear


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[Abstract] [Full Text] [PDF]


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