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RISS 인기검색어
- 검색키워드
- 저자 : J. Alan Sullivan (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Effect of seeding depth on seedling growth and dry matter partitioning in American ginseng
Proctor, John T.A.,Sullivan, J. Alan The Korean Society of Ginseng 2013 Journal of Ginseng Research Vol.37 No.2
Greenhouse and field experiments with American ginseng (Panax quinquefolius L.) stratified seed sown at depths of 10 to 100 mm were carried out to determine effects of seeding depth on seedling emergence, growth and development and to calculate optimum seeding depth. The time to 50% seedling emergence ($E_{50}$) in the field increased linearly from 17 d at 20 mm seeding depth to 42.5 d at 80 mm. Seedling emergence and root weight (economic yield) at the end of the first year each increased quadratically with the increase of seeding depth. Maximum emergence and root yields were produced at sowing depths of 26.9 and 30.6 mm respectively. In a greenhouse pot experiment, increasing seeding depth from 10 to 100 mm increased partitioning of dry matter to leaves from 23.6% to 26.1%, to stems from 6.9% to 14.2%, and decreased dry matter to roots from 69.5% to 59.7%. Optimum seeding depth was 31.1 mm for a corresponding maximum root weight of 119.9 mg. A predictor equation [X (seeding depth, mm)=Y (seed weight, mg)/9.1+20.96] for seeding depth for ginseng, based on data for ten vegetable crops, their seed weights and suggested seeding depths, predicted a seeding depth of 28.3 mm for ginseng similar to that reported above for most pot and field experiments.
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Morphological and Ginsenoside Differences among North American Ginseng Leaves
John T. A. Proctor,Alan J. Sullivan,Vasantha P. V. Rupasinghe,Chung-Ja C. Jackson 고려인삼학회 2011 Journal of Ginseng Research Vol.35 No.2
Leaf characteristics of mature 2, 3 and 4-year-old North American ginseng (Panax quinquefolius L.) leaves on fruiting and nonfruiting (NF) plants were studied. Leaflets of the 2-year-old plants had the lowest fresh and dry weight, area, volume and internal gas volume. Inflorescence removal in 3-year-old plants did not affect leaf characteristics or ginsenoside concentration but in 4-yearold plants it increased leaf fresh (38.6%) and dry (43.9%) weight, leaf area (29.1%), specific leaf mass (11.4%), leaf volume (43.1%), and leaf thickness (12.1%), and decreased leaf water content (6.2%). Cultivated ginseng, although an understorey plant, had the specific leaf mass, 35.6 g m?² (range, 36 to 39 g m?²) and a chlorophyll a/b ratio of 2.40 to 2.61, both suggesting the ability to perform like a sunny habitat plant. Also, specific leaf mass of 35.6 g m?² is similar to that reported for perennial plants, 36.8 g m?², rather than that for annuals, 30.9 g m?².
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Effect of seeding depth on seedling growth and dry matter partitioning in American ginseng
John T. A. Proctor,J. Alan Sullivan 고려인삼학회 2013 Journal of Ginseng Research Vol.37 No.2
Greenhouse and field experiments with American ginseng (Panax quinquefolius L.) stratified seed sown at depths of 10 to 100 mm were carried out to determine effects of seeding depth on seedling emergence, growth and development and to calculate optimum seeding depth. The time to 50% seedling emergence (E50) in the field increased linearly from 17 d at 20 mm seeding depth to 42.5 d at 80 mm. Seedling emergence and root weight (economic yield) at the end of the first year each increased quadratically with the increase of seeding depth. Maximum emergence and root yields were produced at sowing depths of 26.9 and 30.6 mm respectively. In a greenhouse pot experiment, increasing seeding depth from 10 to 100 mm increased partitioning of dry matter to leaves from 23.6% to 26.1%, to stems from 6.9% to 14.2%, and decreased dry matter to roots from 69.5% to 59.7%. Optimum seeding depth was 31.1 mm for a corresponding maximum root weight of 119.9 mg. A predictor equation [X (seeding depth, mm)=Y (seed weight, mg)/9.1+20.96] for seeding depth for ginseng, based on data for ten vegetable crops, their seed weights and suggested seeding depths, predicted a seeding depth of 28.3 mm for ginseng similar to that reported above for most pot and field experiments.
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Morphological and Ginsenoside Differences among North American Ginseng Leaves
Proctor, John T.A.,Sullivan, Alan J.,Rupasinghe, Vasantha P.V.,Jackson, Chung-Ja C. The Korean Society of Ginseng 2011 Journal of Ginseng Research Vol.35 No.2
Leaf characteristics of mature 2, 3 and 4-year-old North American ginseng (Panax quinquefolius L.) leaves on fruiting and non-fruiting(NF) plants were studied. Leaflets of the 2-year-old plants had the lowest fresh and dry weight, area, volume and internal gas volume. Inflorescence removal in 3-year-old plants did not affect leaf characteristics or ginsenoside concentration but in 4-year-old plants it increased leaf fresh (38.6%) and dry (43.9%) weight, leaf area (29.1%), specific leaf mass (11.4%), leaf volume (43.1%), and leaf thickness (12.1%), and decreased leaf water content (6.2%). Cultivated ginseng, although an understorey plant, had the specific leaf mass, 35.6 g $m^{-2}$ (range, 36 to 39 g $m^{-2}$) and a chlorophyll a/b ratio of 2.40 to 2.61, both suggesting the ability to perform like a sunny habitat plant. Also, specific leaf mass of 35.6 g $m^{-2}$ is similar to that reported for perennial plants, 36.8 g $m^{-2}$, rather than that for annuals, 30.9 g $m^{-2}$.
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Shanthanu Krishna Kumar,Tom Hern,David Liscombe,Gopinadhan Paliyath,J. Alan Sullivan,Jayasankar Subramanian 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.3
Postharvest technologies play a key role in enhancing shelf life and maintaining quality characteristics of tender fruits, suchas nectarines ( Prunus persica [L.] Batsch var. nectarina). This research investigated the eff ects of an enhanced freshnessformulation (EFF), containing hexanal as the key ingredient, in enhancing the shelf life of fi eld grown nectarines and itseff ects on the composition of volatile organic compounds (VOCs). ‘Fantasia’ nectarine fruits at two commercial orchards inthe Niagara region were subject to preharvest sprays of 2% EFF (15 and 7 days preharvest) and stored at ambient conditions(25 °C) with volatile analyses conducted at 0, 3, 5, 7, and 11 days postharvest. The volatile analysis study indicated for thefi rst time that hexanal is naturally present in nectarine fruit. This was confi rmed by GC–MS analysis and validated withstandards. GC–EIMS analyses of targeted VOCs validated with standards indicated reduced levels of VOCs associated withfruit ripening and fruity odor, such as lactones, in hexanal-treated fruit, and an increased level of C6 compounds associatedwith unripe fruit. Principal component analysis biplot with scores and loadings of the fruit VOCs and quality parametersindicated a tight association between TSS and lactones, which was inversely associated with fi rmness, ground color, acetates,and ester compounds. Pearson correlation coeffi cients also indicated a very high positive correlation between hexanal andlevels of VOCs, such as 1-hexanol, E-2-hexanal, 3-hexanal, hexen-1-ol, and other C6 acetates. These fi ndings may indicatea delay in the ripening process caused by hexanal formulation, which may be associated with modulated expression of keyripening-related volatile pathways, therefore enhancing the shelf life and quality of nectarines.
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