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Abnormal Seedlings Emerged during Embryo Rescue and Its Remedy for Seedless Grape Breeding
Ji, Wei,Li, Zhiqian,Yao, Wenkong,Gong, Peijie,Wang, Yuejin Korean Society of Horticultural Science 2013 원예과학기술지 Vol.31 No.4
The abnormal seedlings, a common physiological anomalies, emerged during embryo rescue severely restricted grape breeding. To enhance the efficiency of the seedless grape breeding by reducing the production of abnormal seedlings in the course of embryo rescue, we investigated the effects of genotype, media type, embryo style, pre-chilling on the deformity rate of the abnormal seedlings during embryo rescue. The abnormal seedlings were firstly classified into seven categories based on their morphology. Our results indicated that the emergence of abnormal seedlings was highly dependent on the female parent genotype. Polyembryony was advantageous to diminish the number of abnormal plantlets and the germination rate of embryo was 100%. We also found that pre-chilling treatment could reduce the number of abnormal plantlets and promote the embryo germination. The abnormal plantlets were reduced significantly by the addition of $ZnSO_4$ $10{\mu}mol{\cdot}L^{-1}$ or mashed-banana $500mg{\cdot}L^{-1}$ to either embryo development or germination media. Transferring the abnormal seedlings onto the suitable fresh media in 4 weeks after embryo germination provided an effective way to transform them into normal seedlings.
Jiwei Wen,Li Peng,Sing Kiong Nguang 제어·로봇·시스템학회 2014 International Journal of Control, Automation, and Vol.12 No.3
In this paper, the finite-time control problem is investigated for a class of discrete-time Markovian jump systems (MJLSs) with deterministic switching and time-delay. The considered systems are subject to a piecewise-constant transition probability (TP) matrix, which leads to both the deterministic switches and stochastic jumps. First, the stochastic finite-time boundedness (SFTB) and l2 gain analysis for the systems are studied by employing the average dwell time (ADT) approach. Note that a finite-time weighted l2 gain is obtained to measure the disturbance attenuation level. Then, the mode-dependent and variation-dependent controller is designed such that the resulting closed-loop systems are stochastically finite-time bounded and have a guaranteed disturbance attenuation level. Finally, a numerical example is given to verify the potential of the developed results.
Jiwei Ruan,이영훈,용영록 한국원예학회 2013 Horticulture, Environment, and Biotechnology Vol.54 No.2
This study was conducted to evaluate the flowering and fruiting of day-neutral (DN) and ever-bearing (EB)cultivars in high-elevation in Korea. Six DN and five EB cultivars were established in bench-top substrate culture system in high tunnel. Plug transplants were planted on 5 May, 2011 and complete nutrition was supplied during the whole experimentation. Fruit harvest started in early June, and lasted until middle November. Fruit yield was significantly different among DN and EB, and individual cultivars. Generally, summer flower came out earlier and resulted in more summer yield for EB cultivars than for the DN cultivars. However, DN cultivars produced higher autumn yield than EB cultivars. Fruits of DN cultivars showed harder firmness, bigger size, less malformed fruits, deeper surface colors than those of EB cultivars. Fruit surface colors significantly varied with the progressive seasons and an interactive effect between cultivars and harvest time on fruit surface colors was found. Among DN cultivars, ‘San Andreas’ not only showed some typical DN characters such as big fruit and hard firmness, but also showed high values of color parameters. Among EB cultivars, ‘Charlotte’ and ‘Goha’ combination can realize even fruit supply in summer and autumn. Combination of DN cultivar and EN cultivar not only can realize even fruit supply but also can fulfill both fresh consumption and processing purposes in summer and autumn season.
Jiwei Ruan,용영록,Kirk D. Larson 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.6
This study was conducted to evaluate the yield performance for University of California (UC) cultivars ‘Albion’ and ‘San Andreas’ during summer and fall fruiting season in the northeastern highlands of Korea at 750 meters elevation. We investigated the effects of cultivar, planting date and planting material on fruit productivity in a bench-top peat substrate system. For both cultivars, we compared the yield performance of frozen (-2.2℃) bare-root plants (FBR), potted frozen bare-root plants (PFBR), and potted fresh plants (PF) on four dates: 30 Apr., 15 May, 30 May, and 15 Jun., 2010. Fruit harvest commenced in early June and terminated on 2 Dec. For each cultivar and type of planting material, fruit were harvested twice a week and fruit weight and numbers of marketable and non-marketable fruits were determined for each harvest. Both cultivars performed well in summer and autumn production in high land, although marketable fruit yield for ‘San Andreas’ was significantly greater than that of ‘Albion’. Plants planted on 30 Apr. produced the earliest fruit and the greatest marketable yields, 521.0 and 487.0 g/plant, 24.1 and 23.3 ton/hectare for ‘Albion’ PFBR and FBR plants, respectively, and 618.3 and 529.6 g/plant, 28.6 and 24.5 ton/hectare for ‘San Andreas’ PFBR and FBR plants, respectively. Generally, PFBR had higher marketable fruit yield than FBR and PF had the lowest. PFBR is recommended especially for late planting and FBR is acceptable for early planting, while PF is not suitable for this production system. The relationship of fruit productivity and vegetative growth was significantly correlated.
Microbial Communities in Semi-consolidated Carbonate Sediments of the Southwest Indian Ridge
Jiwei Li,Xiaotong Peng,Huaiyang Zhou,Jiangtao Li,Zhilei Sun,Shun Chen 한국미생물학회 2014 The journal of microbiology Vol.52 No.2
White semi-consolidated carbonate sediments attached toblack ferromanganese oxide films were collected approximately50 km west of a newly discovered hydrothermal fieldnear the Southwest Indian Ridge (SWIR). The biodiversity ofthe prokaryotic communities within the field was examinedusing clone library-based culture-independent analysis ofthe exterior black oxides and the interior white carbonates. Subsequent 16S rRNA gene analysis suggested that Gammaproteobacteria,Acidobacteria, and Thaumarchaeota membersdominated the bacterial and archaeal clone libraries. To further characterize the metabolic processes within themicrobial community, analyses of the amoA (coding the alphasubunit of the ammonia monooxygenase for Archaea)and aprA (coding the alpha subunit of the dissimilatory adenosine-5 -phosphosulfate reductase for the sulfate-reducingand sulfur-oxidizing prokaryotes) functional genes wereconducted. The functional gene analysis results suggestedthat Thaumarchaeota and Alphaproteobacteria memberswere the potential players that participated in N and S cyclesin this marine carbonate sedimentary environment. Thispaper is the first to describe the microbial communities andtheir potential metabolic pathways within the semi-consolidatedcarbonate sediments of the SWIR.
Switching Predictive Control for Continuous-time Markovian Jump Delay Systems
Jiwei Wen,Li Peng 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.3
This paper is concerned with switching model predictive control (SMPC) for continuous-time Markovianjump delay systems (MJDSs). First, a piecewise constant switching predictive controller, which only depends onthe average dwell time (ADT) switching laws rather than the jumping modes, is obtained by employing the ADTapproach under the infinite-time predictive control design framework . Such a control strategy is proposed to make atrade-off between robustness and adaptivity when the design complexity of mode-independent and mode-dependentMPC is considered. It is revealed that the SMPC can deal with MJDSs with both time varying and time invariantjump rates and cover the mode-independent MPC as a special cease. Second, the feasibility of the SMPC schemeand the mean square stability of the closed-loop MJDS are discussed by using the stochastic invariance of theellipsoid set over each sampling period. A numerical example is given to illustrate the main results.