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Fanourakis D.,Greek National Agricultural Research Foundation | Fanourakis D.,Technological Educational Institute of Crete | Giday H.,University of Aarhus | Li T.,Chinese Academy of Sciences | And 9 more authors.
Postharvest Biology and Technology | Year: 2016

The vase life sensitivity to mild desiccation (12% weight loss) was addressed in rose, together with alleviation possibilities. The postharvest longevity upon arrival or following mild desiccation was determined on eight cultivars, combined with several morpho-physiological traits. Mild desiccation significantly decreased (10-39%) the vase life of six cultivars (termed sensitive), whereas it did not affect the vase life of two (thus tolerant). More severe desiccation (>12% weight loss) shortened the vase life of a tolerant cultivar. Stomatal control of water loss explained a large part of vase life variation following mild desiccation, whereas cut flower ability to rehydrate or pedicel rigidity (strength, wood density) did not significantly contribute to this variation. Four potentially-mitigating treatments were further tested on the three most sensitive to mild-desiccation cultivars. Antitranspirant treatments [SNP (elicitor of NO) or acetylsalicylic acid in vase water or darkening] decreased the cut flower water loss during the postharvest phase and alleviated the mild-desiccation-induced reduction in vase life. In contrast, Tween 20 (wetting agent) in the vase water shortened vase life. It is concluded that the vase life of previously desiccated cut roses can be extended by employing treatments that reduce the postharvest water loss. © 2016 Elsevier B.V.


Zhou W.L.,Chinese Academy of Agricultural Sciences | Liu W.K.,Chinese Academy of Agricultural Sciences | Liu W.K.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures | Yang Q.C.,Chinese Academy of Agricultural Sciences | Yang Q.C.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures
Journal of Horticultural Science and Biotechnology | Year: 2012

The effect of pre-harvest light intensity on the quality of hydroponically-grown lettuce (Lactuca sativa var. capitata L.) was studied by growing lettuce under 48 h of continuous illumination delivered by red- or blue-light-emitting diodes (LEDs) with a red:blue ratio of 4.0. Four light intensity treatments (50, 100, 150, or 200 μmol m-2 s-1) were applied.The results showed that the nitrate concentrations in lettuce shoots decreased significantly after treatment with 48 h of continuous light, while the contents of soluble sugars and vitamin C increased substantially. It was observed that the effect of pre-harvest short-duration continuous light (PSCL) on improving lettuce quality was significantly influenced by the intensity of the light. The decrease in nitrate concentration and the increases in soluble sugars and vitamin C contents were relatively low at a light intensity of 50 μmol m-2 s-1, but increased gradually as the light intensity increased from 50 μmol m-2 s-1 to 200 μmol m-2 s-1. However, the marginal benefit of increased light intensity in lowering nitrate concentration and increaseing vitamin C content declined rapidly when the light intensity increased beyond 100 μmol m-2 s-1. In conclusion, PSCL offers an effective method by which to improve the quality of lettuce, and a light intensity of between 100 μmol m-2 s-1 - 150 μmol m-2 s-1 is the economic optimum.


Qiu Z.,Chinese Academy of Agricultural Sciences | Qiu Z.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures | Yang Q.,Chinese Academy of Agricultural Sciences | Yang Q.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures | And 2 more authors.
Water, Air, and Soil Pollution | Year: 2013

The photocatalytic degradation effectiveness of six selected typical phytotoxic substances (ferulic, benzoic, gallic, salicylic, tannic, and acetic acid) by two levels of 10 nm TiO2 (11 and 22 g/m2) immobilized on tiles under 254 nm of UV light irradiation was investigated. The results showed that the immobilized nano-TiO2 significantly degraded all phytotoxic substances dissolved in distilled water, and the cumulative degradation rates of ferulic, benzoic, gallic, salicylic, tannic, and acetic acid reached 22.2, 33.6, 48.2, 56.9, 57.5, and 76.0 % after 6 h of treatment, respectively. Furthermore, the cumulative degradation rates of six phytotoxic substances by immobilized nano-TiO2 were different remarkably, i.e.; salicylic acid > benzoic acid, gallic acid > ferulic acid, acetic acid > tannic acid. The maximal photocatalytic degradation efficiencies of all phytotoxic substances appeared at the first 2 h in the three experiments. During the 6-h treatment period, the photocatalytic degradation efficiency of all phytotoxic substances decreased gradually. There was no significant difference in the photocatalytic degradation of benzoic acid and ferulic acid between the two levels of immobilized nano-TiO2 treatments, whereas a significant difference was found in the photocatalytic degradation of salicylic acid, gallic acid, tannic acid, and acetic acid. In a word, nano-TiO2 photocatalysis is an effective method to degrade phytotoxic substances. And the photocatalytic degradation effectiveness of six typical phytotoxic substances may be related to their structures. © 2013 Springer Science+Business Media Dordrecht.


Li K.,Chinese Academy of Agricultural Sciences | Li K.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures | Li Z.,Chinese Academy of Agricultural Sciences | Li Z.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures | And 2 more authors.
Frontiers in Plant Science | Year: 2016

The high energy consumption of a plant factory is the biggest issue in its rapid expansion, especially for lighting electricity, which has been solved to a large extent by light-emitting diodes (LED). However, the remarkable potential for further energy savings remains to be further investigated. In this study, an optical system applied just below the LED was designed. The effects of the system on the growth and photosynthesis of butterhead lettuce (Lactuca sativa var. capitata) were examined, and the performance of the optical improvement in energy savings was evaluated by comparison with the traditional LED illumination mode. The irradiation patterns used were LED with zoom lenses (Z-LED) and conventional non-lenses LED (C-LED). The seedlings in both treatments were exposed to the same light environment over the entire growth period. The improvement saved over half of the light source electricity, while prominently lowering the temperature. Influenced by this, the rate of photosynthesis sharply decreased, causing reductions in plant yield and nitrate content, while having no negative effects on morphological parameters and photosynthetic pigment contents. Nevertheless, the much higher light use efficiency of Z-LEDs makes this system a better approach to illumination in a plant factory with artificial lighting. © 2016 Li, Li and Yang.


Bian Z.H.,Chinese Academy of Agricultural Sciences | Bian Z.H.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures | Yang Q.C.,Chinese Academy of Agricultural Sciences | Yang Q.C.,Key Laboratory of Energy Conservation and Waste Management of Agricultural Structures | And 2 more authors.
Journal of the Science of Food and Agriculture | Year: 2015

Phytochemicals in vegetables are important for human health, and their biosynthesis, metabolism and accumulation are affected by environmental factors. Light condition (light quality, light intensity and photoperiod) is one of the most important environmental variables in regulating vegetable growth, development and phytochemical accumulation, particularly for vegetables produced in controlled environments. With the development of light-emitting diode (LED) technology, the regulation of light environments has become increasingly feasible for the provision of ideal light quality, intensity and photoperiod for protected facilities. In this review, the effects of light quality regulation on phytochemical accumulation in vegetables produced in controlled environments are identified, highlighting the research progress and advantages of LED technology as a light environment regulation tool for modifying phytochemical accumulation in vegetables. © 2014 Society of Chemical Industry.

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