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AOBPreview published online on July 15, 2006
Annals of Botany, 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
Received April 15, 2006
Revised May 9, 2006
Accepted May 30, 2006

Article

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

CAIXI ZHANG 1, KENJI TANABE 2 *, SHIPING WANG 3, FUMIO TAMURA 2, AKIRA YOSHIDA 4, and KAZUHIRO MATSUMOTO 2

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

* To whom correspondence should be addressed.
KENJI TANABE, E-mail: tanabe{at}muses.tottori-u.ac.jp


  Abstract

• 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.

Keywords: Cell division, cell enlargement, fruit size, domestication, Pyrus pyrifolia, pear.
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