DEVELOPMENTAL CHANGES IN CARBOHYDRATE CONTENT IN YOUNG ROSE SHOOTS (Rosa hybrida ‘FRISCO’)

Labeke, Marie-Christine Van; Dambre, P; Bodson, M.; Pien, Helga

doi:10.17660/actahortic.2001.547.23

Cited by 7 publications

(3 citation statements)

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“…In our study, daylength varied between all treatments, whereas DLI only differed for the 30% NB treatment; therefore, our results indicate that daylength is a more important factor for daily starch accumulation than DLI. An effect of DLI on starch accumulation in different plants has previously been reported (Mattson et al, 2008;van Labeke et al, 2001). However, in these studies, differences in DLI corresponded to differences in daylength, which was not the case in our study.…”

Section: Discussioncontrasting

confidence: 67%

Growth of Chrysanthemum in Response to Supplemental Light Provided by Irregular Light Breaks during the Night

Kjær¹,

Ottosen²

2011

J. Amer. Soc. Hort. Sci.

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Circadian rhythms are believed to be of great importance to plant growth and performance under fluctuating climate conditions. However, it is unclear how plants with a functioning circadian clock will respond to irregular light environments that disturb circadian-regulated parameters related to growth. Chrysanthemum (Chrysanthemum morifolium ‘Coral Charm’) was exposed to supplemental light provided as irregular light breaks during the night, achieved by controlling the light based on forecasted solar irradiance and electricity prices. Growth, in terms of carbon gain, was linearly correlated to both daylength and daily light integral. This response was observed irrespective of the irregularity of the light breaks and despite circadian-regulated processes of carbohydrate metabolism, chlorophyll fluorescence, and leaf chlorophyll content being affected. Leaf expansion and stem elongation occurred at a faster rate in plants grown in short days with irregular light breaks during the night period compared with plants grown in a climate with a consecutive long light period, showing that low average light intensity promoted expansion of the photosynthetic area of the plants. These results are important to gain an understanding of the relationship between circadian-regulated processes and plant growth. These results will also contribute to increased energy savings in the use of supplemental light in greenhouse production.

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Section: Discussioncontrasting

confidence: 67%

Growth of Chrysanthemum in Response to Supplemental Light Provided by Irregular Light Breaks during the Night

Kjær¹,

Ottosen²

2011

J. Amer. Soc. Hort. Sci.

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“…The young and in some cases partly unfolded leaves of a young primary shoot represent a sink rather than a source (Mor and Halevy, 1979). According to previous literature a young shoot, up to 10-20 cm long, can be considered as a net sink (Mor and Halevy, 1979;Van Labeke et al, 2001). Another major assumption is that roots start growing earlier than the axillary primary shoot.…”

Section: Major Assumptions and Parameters Of The Modelmentioning

confidence: 99%

“…It has been also reported for rose plants that the leaf underneath an outgrowing axillary bud is the main source of carbohydrates for the shoot (Mor and Halevy, 1979;Van Labeke et al, 2001) and that rose shoot growth is mainly dependent on the assimilate supply available during growth (Marcelis-Van Acker, 1994;Bredmose, 1998).…”

Section: Introductionmentioning

confidence: 96%

Modelling Growth of the Primary Shoot of Rose

Costa¹,

Heuvelink²

2004

Acta Hortic.

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In propagation of rose by leafy stem cuttings, the area of the original leaf is a visible quality determinant of cuttings because it influences rooting (number and dry weight of roots) and length and dry weight of the primary shoot. In this paper a simple photosynthesis-based model is presented to predict elongation of the primary shoot of rose planting material derived from single node leafy stem cuttings. The model describes shoot elongation in response to changes in the original leaf area of cuttings during the first 11 weeks following severance. The model reasonably predicted primary shoot elongation but underestimated shoot length when leaf area was reduced by about 70% or when the complete leaf was removed at 7, 14 or 21 days after severance. The model accurately predicted carbohydrate accumulation during the first 3 weeks after severance. Simulations support the hypothesis that post-severance photosynthesis rather than the initial carbohydrate reserve level is the major determinant of primary shoot growth of single node leafy stem cuttings of rose.

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PROPAGATION | Own-Rooted Cuttings

Costa

2003

Encyclopedia of Rose Science

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DEVELOPMENTAL CHANGES IN CARBOHYDRATE CONTENT IN YOUNG ROSE SHOOTS (Rosa hybrida ‘FRISCO’)

Cited by 7 publications

References 0 publications

Growth of Chrysanthemum in Response to Supplemental Light Provided by Irregular Light Breaks during the Night

Growth of Chrysanthemum in Response to Supplemental Light Provided by Irregular Light Breaks during the Night

Modelling Growth of the Primary Shoot of Rose

PROPAGATION | Own-Rooted Cuttings

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