Aspects of Carbohydrate Balance During Floret Opening in Freesia

Meeteren, U. van; Gelder, H. van; Peppel, Arjen C. van de

doi:10.17660/actahortic.1995.405.14

Cited by 8 publications

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“…Also a longer vase life of Freesia with longer stems, as found in this research, was found previously and explained to be due to the larger carbohydrate pool (Sytsema-Kalkman, PPO Glasshouse Horticulture, unpublished). In contrast to these results, van Meeteren et al (1995) showed a large effect of stem length on the dry weight and carbohydrate content of Freesia buds, but this did not result in better flower opening, it only resulted in a larger flower size.…”

Section: Discussioncontrasting

confidence: 90%

“…In line with these results, we found a high correlation between bud opening and vase life. However, van Meeteren et al (1995) observed no good correlation between sugar content and bud opening in Freesia, indicating that other factors also play a role. It is known that inclusion of sugars in the vase water results in a longer vase life in Freesia (Sytsema, 1964;Woodson, 1987).…”

Section: Discussionmentioning

confidence: 78%

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Effects of Greenhouse Conditions on the Quality and Vase Life of Freesia 'Yvonne'. A Nursery Comparison

Slootweg¹

2005

Acta Hortic.

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Postharvest trials showed marked differences in the length of vase life and in bud opening of Freesia stems of the same cultivar, obtained at a similar time from various nurseries. The factors that cause these differences in vase life and bud opening are yet unknown. We therefore made a detailed comparative investigation on the effect of greenhouse conditions. Corms of Freesia 'Yvonne' from the same stock were delivered to 29 nurseries. Various factors in the greenhouse that may influence vase life and bud opening were monitored. The vase life and bud opening of both the main and the lateral stems were examined with and without transport simulation. Using multivariate statistical techniques, the measured greenhouse conditions were related with the variance in vase life and bud opening. The main factors affecting vase life and bud opening were temperature, light level, CO 2 level, and relative humidity. The values of these factors during the last two weeks of production explained about half of the variance in bud opening and vase life. The results provide useful advise for growers on how to optimise greenhouse conditions in order to get the best possible postharvest quality of their product. INTRODUCTIONCut Freesia stems, even those of the same cultivar, show large differences in vase life and bud opening (van der Pluijm, 1993).This makes it hard for Freesia growers to guarantee the quality of their product. Sytsema-Kalkman (PPO Glasshouse Horticulture, unpublished) showed that the origin of the corms resulted in only small differences in vase life, and she concluded that the major differences were due to greenhouse conditions. In cut roses a similar situation exists, and here a comparison between nurseries proved to be a good tool to determine the correlation between quality and greenhouse conditions (Marissen and Benninga, 2001).

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Section: Discussioncontrasting

confidence: 90%

Section: Discussionmentioning

confidence: 78%

Effects of Greenhouse Conditions on the Quality and Vase Life of Freesia 'Yvonne'. A Nursery Comparison

Slootweg¹

2005

Acta Hortic.

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“…Besides petals, also leaves and stems of cut roses are important sources from which carbohydrates are transported to the flowers (Marissen and La Brijn, 1995;Ichimura et al, 1999). Decreasing the stem length of cut freesia inflorescence greatly reduced the increase in dry weight and in total carbohydrates of the flower buds (Van Meeteren et al, 1995), confirming the role of the stem as store of carbohydrates.…”

Section: Introductionmentioning

confidence: 65%

“…The remaining carbohydrates are partitioned among a hypothetical short-term substrate pool used for the formation of new structural biomass and an 'osmotic pool', which is believed to play an important role as driving force for cell elongation, hence affecting the size of the floret. Flowers accumulate sugars in their petals in accordance to their development stage, even under limited supply of carbohydrates (Van Meeteren et al, 1995). So, this accumulation is not the result of a surplus in the supply of carbohydrates.…”

Section: Carbohydrate Flow In a Floretmentioning

confidence: 99%

Docis: A Model to Simulate Carbohydrate Balance and Development of Inflorescence During Vase Life

Meeteren¹,

Peppel²,

Gelder³

2001

Acta Hortic.

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The concept of a dynamic and deterministic model (DOCIS) was developed to simulate post harvest development of an inflorescence during vase life based on carbohydrate content at harvest. The model was partly parameterized using lily 'Enchantment'. The inflorescence as a system was defined by the state variables: the carbohydrate pool, structural biomass and development stage of each floret in the inflorescence and the carbohydrate pool in the stem. An additional auxiliary state variable was used to describe whether a floret is alive or dead due to shortage of carbohydrate supply. The model is temperature driven. It is assumed that the available carbohydrates are distributed among the floret(bud)s proportional to their total sink strengths. An osmotic pool of the petal cells is included which is treated as an independent sink. By priority, carbohydrates imported by a floret are used for maintenance respiration. Distribution of available carbohydrates among the osmotic and the non-osmotic (substrate available for structural biomass production) pool was assumed to be proportional to the sink strengths of both pools. Sink strength was defined as the capacity to accumulate carbohydrates under conditions of non-limiting carbohydrate supply. Available carbohydrates did not influence osmotic potential of petal juice (vacuolar solution) at a certain development stage. The resulting concept of constant osmotic potential makes it possible to predict floret fresh weight (size), an important aspect of decorative value.

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“…In Euphorbia fulgens ethylene reduces flower opening, while STS or gibberellins promote it (van Leeuwen, 1985). Also, in Lilium and freesia STS promotes the development and opening of flower buds (van Meeteren and De Proft, 1982;van Meeteren et al, 1995).…”

Section: Introductionmentioning

confidence: 99%

NAA and STS effects on potted bougainvillea: Early flower death allows delayed bract abscission

Gago

Monteiro

2012

Postharvest Biology and Technology

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The effects of Silver Thiosulphate (STS) and Naphtalene Acetic Acid (NAA) (0,45%NAA+1,2% NAA-amide at 500 mg.l -1 ) on flowering bud development, anthesis duration, bract longevity and bract photosynthetic rate were studied in Bougainvillea spectabilis 'Killie Campbell' plants, under interior conditions. The relationships between bract longevity and the above parameters were also investigated.NAA induced longer bract longevities, shorter flower anthesis duration and lower percentage of flowers reaching anthesis. STS alone increased duration of flower anthesis but did not affect CD (completely developed) bract abscission, as compared to the water treatment. Depending on the experiment, adding STS to NAA delayed or had no effect on bract abscission. Longer bract longevities were related to shorter flower anthesis and lower percentage of flowers reaching anthesis. Manual removal of flowers from the bract+flower unit increased bract longevity. Despite the low level of irradiance, bracts photosynthesized and plants treated with NAA (alone or with STS) had lower bract photosynthetic rates. Bract photosynthetic activity, although with relevant rates (similar to leaves and most probably capable of covering respiration expenditure) did not seem important as an energy source for bract longevity since bracts that lasted longer had lower photosynthetic rates. In the water control, percentage of flowers reaching anthesis positively correlated with bract photosynthetic rates.In potted bougainvillea under low light conditions, flower senescence and bract abscission are under different types of control. In addition to the classical effect of auxin reducing ethylene production, and/or sensitivity of the abscission zone to ethylene, NAA delays bougainvillea bract abscission via early interruption of flower development.

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Aspects of Carbohydrate Balance During Floret Opening in Freesia

Cited by 8 publications

References 0 publications

Effects of Greenhouse Conditions on the Quality and Vase Life of Freesia 'Yvonne'. A Nursery Comparison

Effects of Greenhouse Conditions on the Quality and Vase Life of Freesia 'Yvonne'. A Nursery Comparison

Docis: A Model to Simulate Carbohydrate Balance and Development of Inflorescence During Vase Life

NAA and STS effects on potted bougainvillea: Early flower death allows delayed bract abscission

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