Articles
DEVELOPMENT OF THE ABSCISSION ZONE AND MORPHOLOGICAL CHANGES OF ABSCISSION CELLS IN THE ABSCISSION PROCESS OF PERSIMMON FRUIT
Article number
601_10
Pages
85 – 87
Language
English
Abstract
Development of the abscission zone in fruit and the relationship between fruit abscission and morphological changes in cells of the abscission zone were investigated using the Japanese persimmon cv.
Hiratanenashi.
Cells of the abscission zone between the calyx and peduncle were differentiated at 5 or 6 weeks before full bloom.
The aggregate of the small cells formed a zone like structure 4 weeks before full bloom.
The abscission zone with 7 or 8 layers was clearly formed 1 week before full bloom.
The cells of the juncture tissue between fruit and peduncle were not uniform, and did not form clear abscission layers like the tissue between the calyx and peduncle.
In abscission, the juncture tissue between fruit and peduncle was softened, while the juncture tissue between calyx and peduncle was smooth and hard.
Fruits were detached from the tree 1 week after full bloom and placed with their peduncle into water at 20 degree C. Abscission began 48 hours after detachment, and had occurred in 72.5% of fruit after 96 hours.
In the abscission zone between the peduncle and calyx, scattered cells with condensed nuclei were observed 24 hours after detachment, and their number increased with time.
From the results, it is suggested that the mechanism of cell separation differed in the juncture tissues between the calyx and peduncle, and between the fruit and peduncle.
It was also suggested that the cell separation of the abscission zone between the calyx and peduncle depended on the process of apoptosis, this process being triggered about 24 hours before fruit abscission occurred.
Hiratanenashi.
Cells of the abscission zone between the calyx and peduncle were differentiated at 5 or 6 weeks before full bloom.
The aggregate of the small cells formed a zone like structure 4 weeks before full bloom.
The abscission zone with 7 or 8 layers was clearly formed 1 week before full bloom.
The cells of the juncture tissue between fruit and peduncle were not uniform, and did not form clear abscission layers like the tissue between the calyx and peduncle.
In abscission, the juncture tissue between fruit and peduncle was softened, while the juncture tissue between calyx and peduncle was smooth and hard.
Fruits were detached from the tree 1 week after full bloom and placed with their peduncle into water at 20 degree C. Abscission began 48 hours after detachment, and had occurred in 72.5% of fruit after 96 hours.
In the abscission zone between the peduncle and calyx, scattered cells with condensed nuclei were observed 24 hours after detachment, and their number increased with time.
From the results, it is suggested that the mechanism of cell separation differed in the juncture tissues between the calyx and peduncle, and between the fruit and peduncle.
It was also suggested that the cell separation of the abscission zone between the calyx and peduncle depended on the process of apoptosis, this process being triggered about 24 hours before fruit abscission occurred.
Publication
Authors
A. Kitajima, K. Sasagawa, K. Hasegawa
Keywords
apoptosis, Diospyros kaki
Online Articles (34)