Cut Flower Productivity and Leaf Area Index of Photosynthesizing Shoots Evaluated by Image Analysis in "Arching" Roses

Shimomura, Nobuko; Inamoto, Katsuhiko; Doi, Motoaki; Sakai, Emiko; Imanishi, Hideo

doi:10.2503/jjshs.72.131

Cited by 11 publications

(6 citation statements)

References 7 publications

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“…One is to optimize the leaf area index (LAI) of the bent‐shoot canopies, and the others are to enhance the photosynthetic capacity of the assimilation shoots before shoot bending and to maintain a high photosynthetic capacity in the shoots after bending. For example, it is proposed that an LAI of 3.0 should be optimal for the production of the shoot‐bending technique (Shimomura et al . 2003).…”

Section: Introductionmentioning

confidence: 99%

Effects of temperature on photosynthesis and plant growth in the assimilation shoots of a rose

Ushio

Mae

Makino

2008

Soil Science and Plant Nutrition

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The effects of temperature on photosynthesis, ribulose-bisphosphate carboxylase (Rubisco) content and whole plant growth were investigated in the assimilation shoots of a rose (Rosa hybrida L.). Assimilation shoots were grown at two different day/night temperature regimes of 20/15°C (LT) and 30/25°C (HT) for 42 days after 1-month growth. Although LT initially suppressed the photosynthetic rate during the first 7 days, prolonged growth at LT enhanced potential photosynthesis. This was associated with increases in Rubisco and N contents at the level of a single leaf. Rubisco content and the photosynthetic rate at 25°C were 2.8-fold and 1.6-fold higher in the LT plants than in the HT plants at day 42, respectively. The relative growth rate at the level of the whole plant was lower in the LT plants during the first 28 days and the leaf area ratio was smaller in the LT plants throughout the experiment. However, enhanced photosynthesis during growth at LT led to increases in the net assimilation rate at the level of the whole plant, and final biomass at day 42 did not differ between the two temperature treatments. To enhance the photosynthetic capacity in assimilation shoots of a rose, cultivation at 20/15°C is better than cultivation at 30/25°C.

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Section: Introductionmentioning

confidence: 99%

Effects of temperature on photosynthesis and plant growth in the assimilation shoots of a rose

Ushio

Mae

Makino

2008

Soil Science and Plant Nutrition

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“…This result suggests that lower-layer shoots contribute to the productivity of cut flowers by exporting retained assimilates chiefly to upright shoots until their death, if they receive insufficient light due to interception by dense upperlayer shoots. Shimomura et al (2003) argued that artificial excision of bent shoots causes a striking imbalance in steady LAI and bending of short and thin basal shoots at random intervals favors maintaining LAI for high yield. The results of experiment 2 support this hypothesis and bent shoots should remain on plants until they completely die spontaneously.…”

Section: Discussionmentioning

confidence: 99%

“…New shoots sprouted from the crowns were grown upright and harvested when they reached commercial harvest maturity for cut flowers. The LAI of the canopy was estimated by image analysis (Shimomura et al, 2003). The date of harvest, stem length and fresh and dry weight of the cut flowers were recorded.…”

Section: Cultivation Of Rose Plantsmentioning

confidence: 99%

“…Nine plants were used for replications in each treatment. The LAI of the canopy was estimated by image analysis (Shimomura et al, 2003). New shoots sprouted from the crowns were grown upright and harvested when they reached commercial harvest maturity for cut flowers.…”

Section: Cultivation Of Rose Plantsmentioning

confidence: 99%

“…If the mass balance of the bent shoots between gain by photosynthesis and loss by respiration is negative, such shaded shoots should be excised. Previously, we proposed a non-destructive estimation of LAI by image analysis for a bent shoot canopy and found that an LAI of around 3.0 is optimum for the mass production of shoot-bending rose plants (Shimomura et al, 2003). To maximize the productivity based on LAI, understanding the characteristics of individual bentshoot layers in the canopy is essential for training plants.…”

Section: Introductionmentioning

confidence: 99%

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Contribution of Individual Bent Shoot Layers to Cut Flower Productivity in Shoot-bending ‘Asami·Red’ Roses

Doi

Shimomura

Inamoto

et al. 2009

J. Japan. Soc. Hort. Sci.

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We estimated the contribution of individual shoot layers in a multi-layered bent canopy to the cut flower productivity of roses ('Asami·Red'). A two-layered bent shoot canopy was established and upper-or lower-layer bent shoots were replaced with artificial replicas of shoots. Replacing upper-layer shoots with replicas facilitated leaf abscission of lower-layer shoots, resulting in severe reduction in the total dry weight of cut flowers (TDWF) compared with plants having two intact bent shoots. When lower-layer shoots were replaced with replicas, the leaf area of upper-layer shoots increased and consequently the excision of lower-layer shoots had little influence on the TDWF. In another experiment, when a three-layered bent shoot canopy was established and light interception by lower-layer shoots was restricted completely by placing a shading film between two of the three layers, the leaf area of the uppermost shoots increased to compensate for the decreased leaf area due to leaf abscission of lower-layer shoots. The excision of lower-layer shoots resulted in more severe reduction of the TDWF than shading. These results suggest that in a multi-layered bent shoot canopy of roses, upper-layer shoots contribute to cut flower yield of plants, primarily through their current photosynthesis with high light interception. However, lower-layer shoots also contribute to cut flower yield by exporting assimilates retained previously, and hence these shoots should remain on plants until they die spontaneously.

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Partitioning of photosynthates originating from bent shoots in the arching and high-rack culture systems of cut rose production

Kajihara

Itou

Katsutani

et al. 2009

Scientia Horticulturae

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Cut Flower Productivity and Leaf Area Index of Photosynthesizing Shoots Evaluated by Image Analysis in "Arching" Roses

Cited by 11 publications

References 7 publications

Effects of temperature on photosynthesis and plant growth in the assimilation shoots of a rose

Effects of temperature on photosynthesis and plant growth in the assimilation shoots of a rose

Contribution of Individual Bent Shoot Layers to Cut Flower Productivity in Shoot-bending ‘Asami·Red’ Roses

Partitioning of photosynthates originating from bent shoots in the arching and high-rack culture systems of cut rose production

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