Articles
GROWTH AND DEVELOPMENT OF CUT ROSE CLONES; INDIRECT SELECTION FOR YIELD
Article number
836_28
Pages
199 – 206
Language
English
Abstract
The shoot yield of 177 large-flowered own-rooted cut rose genotypes was recorded for 40 weeks in year # 1. These genotypes showed a normal distribution over 8 yield classes: 420 shoots per plant.
Forty genotypes, taken in equal numbers from each yield class, were subsequently propagated as cuttings and planted in the glasshouse early year # 2. The growth and development of these young plants were studied until each plant had 2 bottom-breaks (Bb). The mean number of days to the appearance of the 1st and the 2nd Bb, were 43.1 and 57.1 days after planting; days to flower of these shoots took 35.5 and 34.2 days from their appearance.
At flowering the shoot lengths were 77.5 and 83.4 cm; mean length increases were 23 and 26 mm.day-1. Highly significant negative correlation (r= -0.70+++) between the shoot yield in year # 1, and the number of days to appearance of the 1st Bb of the same genotypes in year # 2, shows unique possibilities to indirect selection for future yield of clonal plants.
The probable role of endogenous hormone action in the carbon partitioning in rose plants is discussed.
Forty genotypes, taken in equal numbers from each yield class, were subsequently propagated as cuttings and planted in the glasshouse early year # 2. The growth and development of these young plants were studied until each plant had 2 bottom-breaks (Bb). The mean number of days to the appearance of the 1st and the 2nd Bb, were 43.1 and 57.1 days after planting; days to flower of these shoots took 35.5 and 34.2 days from their appearance.
At flowering the shoot lengths were 77.5 and 83.4 cm; mean length increases were 23 and 26 mm.day-1. Highly significant negative correlation (r= -0.70+++) between the shoot yield in year # 1, and the number of days to appearance of the 1st Bb of the same genotypes in year # 2, shows unique possibilities to indirect selection for future yield of clonal plants.
The probable role of endogenous hormone action in the carbon partitioning in rose plants is discussed.
Publication
Authors
D.P. de Vries, L.A.M. Dubois
Keywords
auxin, axillary bud, bottom-break, bud-break, clonal plants, cytokinin, glasshouse, Hybrid Tea, Rosa, selection
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