THE LENGTH AND NUMBER OF EPIDERMAL CELLS IN LEAVES OF STRAWBERRY PLANTS AS INFLUENCED BY CHILLING TREATMENT DURING GROWTH AND RESTING PERIOD

T. Nishizawa
On 15 July, 1 October, and 22 November 1991, strawberry plants cv. Morioka 16 (a high chilling requiring cultivar for the breaking of the resting state) were kept at 5°C for 0, 15 and 30 days under 4-hr photoperiod (chilling treatment), and then transferred to a growth chamber controlled at 24/22°C under a 14-hr photoperiod (forcing treatment). When the plants received no chilling, both petiole length and leaf area increased gradually at higher leaf positions on account of the increase in the number of cells, irrespective of the dates of forcing treatment; the petiolar cell length and leaf cell area attained the peak in the 2nd or 3rd leaf to emerge under the forcing treatment, and then slightly decreased at higher leaf positions.

When the plants were chilled, both the petiole length and leaf area increased significantly more that those of the plants which received no chilling, especially in the 3rd to 5th leaves to emerge during the forcing conditions. The increase in both petiole length and leaf area was mainly attributed to the increase in the number of cells, when the plants were chilled from 15 July on. In the plants chilled from 1 October and 22 November on, however, the increase in the petiole length was mainly attributed to the increase in the petiolar cell length; concurrently, the increase in the leaf area was due mainly to the increase in the number of cells per leaf area. The rest period of the strawberry plants was not induced by chilling treatment alone.

Nishizawa, T. (1993). THE LENGTH AND NUMBER OF EPIDERMAL CELLS IN LEAVES OF STRAWBERRY PLANTS AS INFLUENCED BY CHILLING TREATMENT DURING GROWTH AND RESTING PERIOD. Acta Hortic. 348, 395-395
DOI: 10.17660/ActaHortic.1993.348.79
https://doi.org/10.17660/ActaHortic.1993.348.79

Acta Horticulturae