Journal of the Japanese Society for Horticultural Science
Online ISSN : 1880-358X
Print ISSN : 0013-7626
ISSN-L : 0013-7626
Effects of Day-length and Temperature on Growth and Bunch Differentiation of Grapevines
Akira SUGIURANaoki UTSUNOMIYAAkira KOBAYASHI
Author information
JOURNALS FREE ACCESS

1975 Volume 43 Issue 4 Pages 387-392

Details
Abstract

The combination effects of day-length and temperature on the growth and bunch differentiation of grapes were observed with one-year-old grafted vines of Delaware (V. labruscana) and Muscat of Alexandria (V. vinifera) in natural light growth cabinets by treating as follows; i) 20°C-short day (8-hour), ii) 20°C-long day (16-hour), iii) 30°C-short day (8-hour), and iv) 30°C-long day (16-hour).
1) In Delaware, shoot growth and bunch differentiation were greatly retarded on short days regardless of temperature, while promoted remarkably on long days, the trend being more marked at 20°C than at 20°C. However, shoots elongated so rapidly on 30°C-long days that most of lateral buds at their basal part became barren.
2) In Muscat of Alexandria, shoot growth and bunch differentiation were less sensitive to day-length than to temperature. Shoot growth was considerably ensured at 30°C even on short days, though it was greatly retarded on 20°C-short days. Bunch differentiation was best on 30°C-long days, followed by 30°C-short days, 20°C -short days, and 20°C-long days in the order. Particularly no bunch differentiation occurred on 20°C-long days all along the shoot.
3) Therefore, to utilize fully the room space in the vine growing under glass or plastic film, 20°C-long days seem to be best condition for Delaware, and 30°C-long days for Muscat of Alexandria from the stand-points of shoot growth and bunch differentiation. It is, however, noticeable that root growth and wood maturity were generally better on short days than on long days in both cultivars.

Information related to the author
© Japanese Society for Horticultural Science
Previous article Next article
feedback
Top