EFFECT OF LIGHT-INTENSITY ON ABNORMAL SWELLING OF PEDUNCLE IN MUSCAT OF ALEXANDRIA GRAPE

Citation
G. Okamoto et al., EFFECT OF LIGHT-INTENSITY ON ABNORMAL SWELLING OF PEDUNCLE IN MUSCAT OF ALEXANDRIA GRAPE, Engei Gakkai Zasshi, 67(1), 1998, pp. 9-13
Citations number
17
Categorie Soggetti
Horticulture
Journal title
ISSN journal
00137626
Volume
67
Issue
1
Year of publication
1998
Pages
9 - 13
Database
ISI
SICI code
0013-7626(1998)67:1<9:EOLOAS>2.0.ZU;2-H
Abstract
'Muscat of Alexandria' grapevines, grown under heated greenhouses, sho w abnormal swelling on the peduncles and rachises during an early stag e of berry growth. The cause of this abnormality was investigated by c ontrolling the light intensity to the clusters. Complete shading bf th e peduncular nodes for 4 weeks after full bloom caused a noticeable sw elling in all the treated peduncles. Fifty % shading caused swelling i n half the number of the treated peduncles. The rate and the degree of swelling were reduced by the exposure of clusters to sunlight or by u sing a sunlight reflector film. In vitro culture of excised disks from swollen peduncles revealed active division of callus cells even on ho rmone-free MS medium. The division was stimulated when the cultures we re kept in the dark. These results suggest that accumulation of some l ight-decomposable factors at the peduncular nodes causes this abnormal ity.