Journal of Experimental Botany, Vol 50, 1593-1597, Copyright © 1999 by Oxford University Press
K Higashi, K Hosoya and H Ezura
A major issue in plant development in higher plants is the determination of
fruit size. In order to address the mechanism, the histological observation
of cells during fruit development between two melon (Cucumis
melo L. reticulatus) genotypes, Fuyu A and
Natsu 4, was used. Although the two genotypes have nearly identical
backgrounds, the fruit of Fuyu A is larger than that of Natsu 4 when grown
under the same conditions. The microscopic observation of pericarp cells in
several developmental stages showed that there were clear differences in
cell size between the two genotypes. In spite of its smaller fruit size,
the cell size of Natsu 4 was somewhat larger than that of Fuyu A. the cell
proliferation period of Fuyu A was longer than that of Natsu 4, which may
account for the difference in the cell number between both genotypes.
Surprisingly, the difference in fruit size could also be defined by the
number of the cells when each genotype was cultivated in different
temperatures. These results suggest that fruit size is determined by the
amount of cell proliferation in the early stage of fruit development and
that the factor which regulates the amount of cell proliferation is
affected by temperature.Keywords: Cucumis
melo, cell proliferation, fruit development.
ARTICLES
Histological analysis of fruit development between two melon (Cucumis melo L. reticulatus) genotypes setting a different size of fruit
Plant Biotechnology Institute, Ibaraki Agricultural Center, Ago 3165-1, Iwama, Nishi Ibaraki, Ibaraki 319-0292, Japan; Present address: Gene Experiment Center, University of Tsukuba, Tsukuba, Ibaraki 305-8572, Japan; Corresponding author; Fax: +81 299 45 8351; E-mail: ezura@nocs.tsukuba-noc.affrc.go.jp
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