Proper period and temperature for transportation of cucumber and tomato transplants

With an increased demand for high-quality transplants, vegetable growers have begun to purchase grafted transplants from specialized propagators. These are often shipped over long distances, but improper transport conditions can deteriorate transplant quality. To determine the appropriate period and temperature for transporting grafted transplants, we stored cucumber and tomato transplants in darkness at 6, 9, 12, 15, and 18 o C for 3, 6, 9, 12, and 15 days, and subsequently cultivated these in a greenhouse for 15 days. We investigated the changes in plant height and SPAD value during storage, as well as the early growth of the stored transplants during subsequent cultivation. Increasing temperature during storage promoted stem elongation in both transplant species, with cucumber transplants showing greater stem elongation than tomato transplants. SPAD values of cucumber and tomato transplants tended to decrease with increasing storage temperature, declining even further with extended storage period. The cucumber transplants stored for 3 days and the tomato transplants stored for 6 days, showed no decrease in percent survival and no delay of growth after transplanting compared with non-stored transplants. From these results, we suggest that the appropriate temperature for transporting cucumber and tomato transplants in darkness is 6A degrees C, and the appropriate period of storage in darkness are 3 and 6 days for cucumber and tomato transplants, respectively. Controlling transportation conditions can avoid the deterioration of transplant quality during transport and the delay of early growth after transplanting.OAIID:RECH_ACHV_DSTSH_NO:T201615743RECH_ACHV_FG:RR00200001ADJUST_YN:EMP_ID:A075898CITE_RATE:.662FILENAME:2016-12_HEB_오이토마토묘저장(곽유리나).pdfDEPT_NM:식물생산과학부EMAIL:[email protected]_YN:YFILEURL:https://srnd.snu.ac.kr/eXrepEIR/fws/file/02187ae3-7bcb-4830-af7a-3bfad7f36954/linkCONFIRM:

Antimicrobial Activity of Thinned Strawberry Fruits at Different Maturation Stages

Among the phenolic compounds that is generally present in strawberry fruits, five simple phenolics, three flavonoids, and a stilbene were tested for their antimicrobial activity against seven fungi and one oomycete. trans-Cinnamic acid showed strong antimicrobial activity, and the antimicrobial effect of the simple phenolics decreased with an increase in the number of hydroxyl groups. Phytophthora capsici was the most susceptible to the phenolic compounds tested in this study. trans-Cinnamic acid, p-hydroxybenzoic acid, and kaempferol were mainly detected in 'Seolhyang' strawberry fruits, and the total phenolic contents of the fruits decreased during their development. Extracts of the green #1-10% red color# and red #above 90% red color# strawberry fruits reduced the mycelial growth and zoospore germination rate of P. capsici, and the extract of red strawberry fruit showed strong antimicrobial activity against the zoospore germination of P. capsici. These results indicate that strawberry fruits contain antimicrobial phenolic compounds and that strawberry fruit extract can be used as a natural fungistat.OAIID:oai:osos.snu.ac.kr:snu2012-01/102/0000027607/6SEQ:6PERF_CD:SNU2012-01EVAL_ITEM_CD:102USER_ID:0000027607ADJUST_YN:YEMP_ID:A075898DEPT_CD:517CITE_RATE:.237FILENAME:2012-12-kjhst-딸기미식용과-항균활성-김동섭.pdfDEPT_NM:식물생산과학부EMAIL:[email protected]_YN:NCONFIRM:

Growth of Runner Plants Grown in a Plant Factory as Affected by Light Intensity and Container Volume

Transplant production in a plant factory with artificial lighting provides several benefits; (1) rapid and uniform transplant production, (2) high production rate per unit area, and (3) production of disease free transplants production. To improve the growth of runner plants when strawberry transplants are produced in a plant factory, we conducted two experiments to investigate (1) the effect of different light intensity for stock and runner plants on the growth of runner plants, and (2) the effect of different container volume for runner plants on their growth. When the stock and runner plants were grown under nine different light conditions composed of three different light intensities (100, 200, and 400 mu mol.m(-2) .s(-1) PPF) for each stock and runner plants, increasing the light intensity for stock plants promoted the growth of runner plants, however, the growth of runner plants was not enhanced by increasing the light intensity for runner plants under same light intensity condition for stock plants. We also cultivated runner plants using plug trays with four different container volumes (21, 34, 73, and 150 mL) for 20 days after placing the stock plants, and found that using plug trays with lager container volume did not enhance the growth of runner plants. These results indicate that providing optimal condition for stock plants, rather than the runner plants, is more important for increasing the growth of the runner plants and that the efficiency of strawberry transplant production in a plant factory can be improved by decreasing light intensity or container volume for runner plants.N

Growth and Quality of Baby Leaf Vegetables Hydroponically Grown in a Plant Factory with Artificial Lighting as Affected by Composition of Nutrient Solution

The objective of this study was to investigate the effects of composition of nutrient solution on the growth and quality of baby leaf vegetables (tah tsai, romaine lettuce, beet, and red radish) hydroponically cultivated in a plant factory with artificial lighting (PFAL). Seeds of the four vegetable crops were sown in urethane sponges and cultivated for 14 days in a PFAL. Light intensity and photoperiod were 110 μmol･m -2･s -1 and 16 h･d -1 , respectively; and air temperature in photo-/dark periods was maintained at 25/20°C. Tap water was suppied for seven days after sowing, and then tap water (TW) and the nutrient solutions of Korea wonshi (KRWS), Japan enshi (JPES), and Yamazaki solution for lettuce (YMAK) were supplied for seven days. Fourteen days after sowing, the fresh weight of tah tsai and romaine lettuce was greatest in YMZK treatment, while there was no significant difference among nutrient solutions in beet and red radish. When we compared leaf color using Hunters a value, KRWS and JPES increased green color in baby leaf vegetables, while YMZK increased red color. Total phenolic content of romaine lettuce was greatest in KRWS treatment, but that in tah tsai, beet, and red radish showed no significant difference among nutrient solutions. Results suggest that KRWS enhances the growth and quality of romaine lettuce, while YMZK is appropriate for enhancing the growth and red color of beet and red radish hydroponically grown in a PFAL.OAIID:oai:osos.snu.ac.kr:snu2015-01/104/0000027607/5ADJUST_YN:NEMP_ID:A075898DEPT_CD:517CITE_RATE:0FILENAME:(곽유리나)growth_and_quality_of_baby_leaf_vegetables_hydroponically_grown_in_a_plant_factory_with_artificial··.pdfDEPT_NM:식물생산과학부CONFIRM:

Growth of Cucumber Scions, Rootstocks, and Grafted Seedlings as Affected by Different Irrigation Regimes during Cultivation of ‘Joenbaekdadagi’ and ‘Heukjong’ Seedlings in a Plant Factory with Artificial Lighting

Irrigation scheduling and programming are very effective tools for efficient water use in a plant factory with artificial lighting (PFAL). In order to confirm optimal irrigation schemes for the production of cucumber scions and rootstocks in a PFAL, in this study, four different start points of irrigation were applied by measuring the weight of the plug tray to compare the growth of cucumber scions and rootstocks cultivated in a PFAL. Additionally, the growth characteristics of cucumber seedlings grafted with scions and rootstocks cultivated between in a greenhouse and in a PFAL were investigated. Although the growth of cucumber scions and rootstocks was highest when irrigation was conducted at 70% of water content in a medium, the growth of grafted cucumber seedlings before and after transplanting was not significantly different among the irrigation treatments in a PFAL. However, water use efficiency (WUE) during cucumber scions and rootstock production in a PFAL was higher at 60% than at 70%. Considering seedling growth and the efficiency of irrigation such as WUE and irrigation schedule, the optimal start point of irrigation during the production of cucumber scions and rootstocks in a PFAL was determined as 60% of water content in a medium. When the optimal irrigation regime was applied to the production of cucumber scions and rootstocks in a PFAL, the morphological characteristics of cucumber scions and rootstocks cultivated in a PFAL were more suitable for grafting compared with that of the cucumber scions and rootstocks cultivated conventionally in a greenhouse. The favorable environmental conditions during the cultivation of cucumber scions and rootstocks in a PFAL also positively affected the flowering response of cucumber grafted seedlings after transplanting

Root-zone cooling affects growth and development of paprika transplants grown in rockwool cubes

The possibility of improving the efficiency of transplant production during a summer season was studied by applying partial cooling of the root-zone during the cultivation of paprika transplants in a greenhouse. Paprika seedlings produced in a closed transplant production system were transferred to rockwool cubes, and cool-water circulation systems using plastic and stainless pipes were tested in a greenhouse during a summer season. The root-zone temperature of rockwool cubes and growth and development of paprika transplants as affected by root-zone cooling were investigated. When plastic pipes were used, the cooling efficacy by circulation of cool water (17A degrees C) was the greatest and the temperature of rockwool cubes decreased by 3.6A degrees C during the day time on a sunny day. Partial cooling of the root-zone enhanced root growth and increased number of flowers as compared with the transplants grown on uncooled rockwool cubes. The results indicate that partial cooling of the root-zone can alleviate damages to transplants commonly caused under high air temperature conditions, which could efficiently improve the paprika transplant production efficiency in greenhouses during the summer season.OAIID:oai:osos.snu.ac.kr:snu2014-01/102/0000027607/1SEQ:1PERF_CD:SNU2014-01EVAL_ITEM_CD:102USER_ID:0000027607ADJUST_YN:YEMP_ID:A075898DEPT_CD:517CITE_RATE:.491FILENAME:2014-02-heb-파프리카 근권냉방-곽유리나_김동섭.pdfDEPT_NM:식물생산과학부SCOPUS_YN:NCONFIRM:

Growth and quality of sprouts of six vegetables cultivated under different light intensity and quality

Vegetable sprouts (alfalfa, broccoli, clover, kohlrabi, radish, and red radish) were cultivated under three monochromatic light regimes (red, green, and blue) with five different light intensities (0, 12.5, 25, 50, and 100 µmol·m-2·s-1) to investigate the effects of light intensity and quality on the growth and total phenolic content of the vegetable sprouts. The light quality and intensity had a direct effect on hypocotyl elongation in vegetable sprouts. Increasing blue light intensity enhanced suppression of hypocotyl elongation in all of the vegetable sprouts. Red light also reduced hypocotyl length in alfalfa and clover sprouts comparing those grown in darkness. The fresh weight of broccoli and radish sprouts markedly increased when red light intensity was 100 µmol·m-2·s-1; however, light use efficiency (LUE) decreased with increasing light intensity. Total phenolic content was reduced by increasing red light intensity in alfalfa and red radish sprouts.OAIID:oai:osos.snu.ac.kr:snu2015-01/102/0000027607/4ADJUST_YN:YEMP_ID:A075898DEPT_CD:517CITE_RATE:.725FILENAME:2015-08-heb-새싹_광질_광량-곽유리나_김경구.pdfDEPT_NM:식물생산과학부SCOPUS_YN:YCONFIRM:

Simulation of the number of strawberry transplants produced by an autotrophic transplant production method in a plant factory with artificial lighting

To verify the productivity of the autotrophic transplant production method (ATPM), a novel propagation method in a plant factory with artificial lighting for transplant production (T-PFAL), strawberry transplants were produced by the ATPM for 365 days. A total of 3497 transplants were produced by the ATPM over 365 days with nine propagules in a cultivation area of 3.6 m(2) in the T-PFAL. When the simulated results were fit with the measured results, the propagation cycle timescales from planting propagules to producing the first, second, and third runner plants were 15, 27, and 43 days, respectively. The cumulative number of transplants (CNT) produced from 5, 10, and 20 initial propagules in a cultivation area of 36 m(2) over 365 days was simulated by the verified program along with the propagation cycles, and these values were 27,970, 30,010, and 31,900, respectively. The simulated CNTs from nine initial propagules in 18 and 72 m(2) over 365 days were 15,950 and 55,940, respectively. These results indicate that the ATPM is an appropriate propagation method to produce transplants rapidly in a T-PFAL, especially when the number of propagules or propagules is limited.Y

Simulation of the Number of Strawberry Transplants Produced by an Autotrophic Transplant Production Method in a Plant Factory with Artificial Lighting

To verify the productivity of the autotrophic transplant production method (ATPM), a novel propagation method in a plant factory with artificial lighting for transplant production (T-PFAL), strawberry transplants were produced by the ATPM for 365 days. A total of 3497 transplants were produced by the ATPM over 365 days with nine propagules in a cultivation area of 3.6 m2 in the T-PFAL. When the simulated results were fit with the measured results, the propagation cycle timescales from planting propagules to producing the first, second, and third runner plants were 15, 27, and 43 days, respectively. The cumulative number of transplants (CNT) produced from 5, 10, and 20 initial propagules in a cultivation area of 36 m2 over 365 days was simulated by the verified program along with the propagation cycles, and these values were 27,970, 30,010, and 31,900, respectively. The simulated CNTs from nine initial propagules in 18 and 72 m2 over 365 days were 15,950 and 55,940, respectively. These results indicate that the ATPM is an appropriate propagation method to produce transplants rapidly in a T-PFAL, especially when the number of propagules or propagules is limited

Antimicrobial Activity of Various Parts of Tomato Plants Varied with Different Solvent Extracts

The antimicrobial activity of acetone, hexane, dichloromethane, and methanol extracts from leaves, stems, immature green fruits, and red fruits of tomato plants was examined against six phytopathogens. The minimum inhibitory concentration (MIC) of the acetonic extracts from these four plant parts was lower than that of the other solvents. Among the acetonic extracts, tomato leaves had a lower MIC than the other tomato parts. The acetonic extract from tomato leaves was therefore selected as a source of antimicrobial substances. The acetonic extract from tomato leaves inhibited mycelial growth of Fusarium oxysporum f. sp. lycopersici, Glomerella cingulata, and Rhizoctonia solani. Mycelial growth of R. solani treated with acetone extract from leaves showed more susceptibility than the other phytopathogens. Using 0.31 mg/ml of the acetonic extract from leaves, mycelial growth of R. solani on days 1, 2, and 3 decreased by 50.0, 52.1, and 64.0%, respectively, compared with acetone solvent treatment. The antimicrobial compounds effective against R. solani were identified as linolenic acid and caffeic acid by bioautography and GC-MS. These two compounds were used to treat six phytopathogens to confirm their antimicrobial activities. Linolenic acid inhibited mycelial growth of R. solani, while caffeic acid showed only slight antimicrobial activity. Results : indicated that we propose extracts from tomato leaves which included antimicrobial compounds may provide a new lead in the pursuit of new biological sources of agrochemical candidates