Effects of Light on Growth and Flowering of Rosa hybrids `Mercedes'

Maas, F.M.; Bakx, Edwin J.

doi:10.21273/jashs.120.4.571

Cited by 33 publications

(15 citation statements)

References 24 publications

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“…So far, very few attempts have been made to modulate rose architecture through qualitative light treatments. In the miniature rose (Rosa hybrida), assays to reduce plant height using far-red light-absorbing filters failed (Cerny et al 2003), while some success was achieved in increasing stem length and dry weight of Rosa hybrida 'Mercedes' shoots by reducing the amount of blue light in the white fluorescent light (Maas & Bakx 1995).…”

Section: Introductionmentioning

confidence: 99%

Blue light effects on rose photosynthesis and photomorphogenesis

et al. 2012

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Through its impact on photosynthesis and morphogenesis, light is the environmental factor that most affects plant architecture. Using light rather than chemicals to manage plant architecture could reduce the impact on the environment. However, the understanding of how light modulates plant architecture is still poor and further research is needed. To address this question, we examined the development of two rose cultivars, Rosa hybrida'Radrazz' and Rosa chinensis'Old Blush', cultivated under two light qualities. Plants were grown from one-node cuttings for 6 weeks under white or blue light at equal photosynthetic efficiencies. While plant development was totally inhibited in darkness, blue light could sustain full development from bud burst until flowering. Blue light reduced the net CO(2) assimilation rate of fully expanded leaves in both cultivars, despite increasing stomatal conductance and intercellular CO(2) concentrations. In 'Radrazz', the reduction in CO(2) assimilation under blue light was related to a decrease in photosynthetic pigment content, while in both cultivars, the chl a/b ratio increased. Surprisingly, blue light could induce the same organogenetic activity of the shoot apical meristem, growth of the metamers and flower development as white light. The normal development of rose plants under blue light reveals the strong adaptive properties of rose plants to their light environment. It also indicates that photomorphogenetic processes can all be triggered by blue wavelengths and that despite a lower assimilation rate, blue light can provide sufficient energy via photosynthesis to sustain normal growth and development in roses.

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Section: Introductionmentioning

confidence: 99%

Blue light effects on rose photosynthesis and photomorphogenesis

et al. 2012

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“…As in many species, organ size in rose is influenced by environmental factors, such as water (Demotes-Mainard et al, 2013), or nitrogen (Ashok and Rengasamy, 2000; Huché-Thélier et al, 2011) availability, light quality (Rajapakse and Kelly, 1994; Maas and Bakx, 1995) and intensity (Hopper and Hammer, 1991; Bredmose, 1993; Maas and Bakx, 1995), mechanical stimulation (Morel et al, 2012), and genotype (Morel et al, 2009). Current knowledge of the effects of environmental factors is not sufficient to predict internode or leaf size in a range of environments.…”

Section: Introductionmentioning

confidence: 99%

Rose bush leaf and internode expansion dynamics: analysis and development of a model capturing interplant variability

et al. 2013

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Rose bush architecture, among other factors, such as plant health, determines plant visual quality. The commercial product is the individual plant and interplant variability may be high within a crop. Thus, both mean plant architecture and interplant variability should be studied. Expansion is an important feature of architecture, but it has been little studied at the level of individual organs in rose bushes. We investigated the expansion kinetics of primary shoot organs, to develop a model reproducing the organ expansion of real crops from non-destructive input variables. We took interplant variability in expansion kinetics and the model's ability to simulate this variability into account. Changes in leaflet and internode dimensions over thermal time were recorded for primary shoot expansion, on 83 plants from three crops grown in different climatic conditions and densities. An empirical model was developed, to reproduce organ expansion kinetics for individual plants of a real crop of rose bush primary shoots. Leaflet or internode length was simulated as a logistic function of thermal time. The model was evaluated by cross-validation. We found that differences in leaflet or internode expansion kinetics between phytomer positions and between plants at a given phytomer position were due mostly to large differences in time of organ expansion and expansion rate, rather than differences in expansion duration. Thus, in the model, the parameters linked to expansion duration were predicted by values common to all plants, whereas variability in final size and organ expansion time was captured by input data. The model accurately simulated leaflet and internode expansion for individual plants (RMSEP = 7.3 and 10.2% of final length, respectively). Thus, this study defines the measurements required to simulate expansion and provides the first model simulating organ expansion in rosebush to capture interplant variability.

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“…At a DLI less than 5 mol·m -2 ·d -1 , flowering is inhibited or delayed for african violets (Saintpaulia ionantha) (Faust and Heins, 1994), roses (Maas and Bakx, 1995), and geranium (Armitage et al, 1981b). Increasing the DLI from 5 to 10 mol·m -2 ·d -1 has been shown to decrease the number of days to flower for geranium (Armitage et al, 1981b;Kaczperski et al, 1991); however, further increasing the DLI above 10 mol·m -2 ·d -1 did not significantly effect the time to flower (Armitage et al, 1990(Armitage et al, , 1981bWhite and Warrington, 1984).…”

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confidence: 99%

Mapping Monthly Distribution of Daily Light Integrals across the Contiguous United States

Korczynski¹,

Logan²,

Faust³

2002

horttech

116

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The daily light integral (DLI) is a measurement of the total amount of photosynthetically active radiation delivered over a 24-hour period and is an important factor influencing plant growth over weeks and months. Contour maps were developed to demonstrate the mean DLI for each month of the year across the contiguous United States. The maps are based on 30 years of solar radiation data for 216 sites compiled and reported by the National Renewable Energy Lab in radiometric units (watt-hours per m-2·d-1, from 300 to 3,000 nm) that we converted to quantum units (mol·m-2·d-1, 400 to 700 nm). The mean DLI ranges from 5 to 10 mol·m-2·d-1 across the northern U.S. in December to 55 to 60 mol·m-2·d-1 in the southwestern U.S. in May through July. From October through February, the differences in DLI primarily occur between the northern and southern U.S., while from May through August the differences in DLI primarily occur between the eastern and western U.S. The DLI changes rapidly during the months before and after the vernal and autumnal equinoxes, e.g., increasing by more than 60% from February to April in many locations. The contour maps provide a means of estimating the typical DLI received across the U.S. throughout the year.

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Effects of Light on Growth and Flowering of Rosa hybrids `Mercedes'

Cited by 33 publications

References 24 publications

Blue light effects on rose photosynthesis and photomorphogenesis

Blue light effects on rose photosynthesis and photomorphogenesis

Rose bush leaf and internode expansion dynamics: analysis and development of a model capturing interplant variability

Mapping Monthly Distribution of Daily Light Integrals across the Contiguous United States

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