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Liyun Shi,Songlin He,Zheng Wang,Wan Soon Kim 한국원예학회 2021 원예과학기술지 Vol.39 No.1
Preharvest conditions, including photoperiod and irrigation regime, affect the keeping quality of long stem roses (Rosa x hybrida). Rose plants of the cultivar ‘Charming Black’ were subjected to four different treatments to investigate how nocturnal supplemental lighting and different irrigation regimes influence post-harvest performance. Vase life, ornamental quality, water balance, petal color, vacuolar pH, soluble sugar content, and soluble protein content were investigated in this study. Treatment with nocturnal supplemental lighting extended the vase life and increased the daily ornamental value in cut roses. In addition, flowers grown under nocturnal supplemental lighting and without irrigation had significantly improved flower color and ornamental value and the highest values for soluble sugar content and soluble protein content. Withholding irrigation under supplemental lighting promoted maintenance of the water balance, which prolonged the vase life of the cut flowers. This study illustrates that supplemental lighting is helpful in extending the vase life of cut roses and that a non-irrigation regime under supplemental lighting results in the most promising physiological and biochemical responses.
Liyun Shi,김완순 한국원예학회 2014 Horticulture, Environment, and Biotechnology Vol.55 No.2
Cut rose ‘Charming Black’ was subjected to three treatments to investigate whether a no-irrigation regimecauses drought stress during nocturnal supplemental lighting, and to investigate the effect of drought stress on the growthand quality of the cut flower. During the experiment, shoot length, quality of flower, photosynthetic rate, and chlorophylland carotenoid contents were measured. Supplemental lighting treatment group grew faster and decreased the percentageof blind shoot; however, several physiological disorders were appeared under different environment conditions. Insupplemental lighting (90 μmol·m-2·s-1 PPFD) treatment group, the shoot grew well and flowered early with irrigation onceper hour, but drought stress and a decrease in biomass occurred without irrigation. Water deficit in the no-irrigationregime under supplemental lighting affected the plant growth and caused malformation of the flower. Drought stressalso had a negative effect on the photosynthetic machinery with a reduction in carotenoid and chlorophyll contents. As a result the photosynthetic rate was also decreased.
Liyun Shi,Zheng Wang,김완순 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.1
To investigate the responses of the cut rose ‘Charming Black’ to drought stress at diff erent growth stages, we defi ned fi vestages of fl owering and shoot development defi ned from initiation of the axillary bud to full complement of the fl oral parts. Drought stress was applied from earliest bud break (stage 1) to fl oral bud appearance (stage 5). After the stage of treatment,irrigation was restored to normal levels. Results showed that rose plant growth was not only infl uenced by the environmentbut also by diff erent stages of fl oral bud appearance. The stem length as well as the time it took to reach diff erent stages ofrose development was infl uenced by the applied irrigation and supplemental lighting conditions. Drought stress did not havenegative eff ects on the quality of the fl ower at stage 1. Drought stress reduced the vegetative growth phase and promotedfl owering in the early stages (2–3), and signifi cantly decreased shoot length, shoot weight and leaf area. However, at thestage prior to fl ower appearance (stage 5) drought stress was more severe. The most damage was accompanied by malformedfl oral buds that had shorter petal length and distorted petals. Furthermore, photosynthesis was negatively aff ected by droughtstress at stage 5, even after re-irrigation, for which this negative eff ect could not be compensated.
Liyun Shi,Zheng Wang,김완순 한국원예학회 2019 Horticulture, Environment, and Biotechnology Vol.60 No.3
The critical water content in slab, and eff ects of drought on shoot growth and gas exchange characteristics of the cut rose‘Charming Black’ were investigated. Four diff erent irrigation regimes were applied to rose plants during supplementallighting (90 μmol m −2 s −1 PAR). Water content in slab was controlled as 80%, 60%, 40%, and 20% in T1, T2, T3, and T4,respectively. No signifi cant diff erence between T1 and T2 was found when water content in slab was above 60%. However,reduction in water use effi ciency has been observed with the decline of water content in slab. When the water content droppedbelow 60% in slab, the shoot growth rate decreased, and a signifi cant reduction of 30% and 38% in shoot growth, 44% and51% in shoot weight, and 34% and 56% in leaf area have been observed under T3 and T4 respectively. Also, petal lengthand diameter of fl oral buds were hampered due to the water defi cit. Lowest net CO 2 assimilation rate occurred at the lowestwater content in slab (20%). Besides, T3 (40%) also caused a signifi cant reduction (63%) in photosynthesis. Sigmoid functionwas simulated to fi nd the fraction of total available water that crop can extract from root zone without suff ering fromdrought stress: the fraction is 0.42. Meanwhile, critical water content was calculated as 46.6%. This study showed that whenthe water content in slab was below the critical water content, drought stress occurred.
Zhang, Liyun,Ding, Yuxiao,Koh, Yoobin Esther,Mun, Bongjin Simon,Wu, Kuang-Hsu,Niu, Yiming,Shi, Wen,Zhang, Bingsen Elsevier 2020 Carbon Vol.156 No.-
<P><B>Abstract</B></P> <P>Tuning the fine structure of carbon support is crucial for modifying the metal-support interface (MSI) in order to harvest a high-performance catalysis. Herein, a core–shell sp<SUP>3</SUP>@sp<SUP>2</SUP> nanocarbon (nanodiamond@graphene, ND@G) and a pure sp<SUP>2</SUP> carbon derivative (onion-like carbon, OLC) were applied to support Pd nanoparticles. We found that Pd/ND@G displayed a superior catalytic activity for CO oxidation reaction with a TOF of 2.9 times higher than that of Pd/OLC at 46 °C. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and ambient pressure X-ray photoelectron spectroscopy (AP-XPS) revealed that, different with the Pd/OLC system, a unique interface microstructure was formed in Pd/ND@G, which not only provides a high exposure of active sites, but also enhances the Pd surface reactivity toward oxygen species, thus leading to a superior catalytic activity of Pd/ND@G. Moreover, the temperature-programmed surface reaction (TPSR) results showed that CO oxidation on Pd/ND@G undergoes an unusual termolecular Eley–Rideal (TER) mechanism, which has a lower energy barrier as compared to the traditional Langmuir-Hinshelwood (LH) and ER mechanism.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>