• Journal of Plant Biology
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• v.38 no.3
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• pp.235-242
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• 1995

Effects of methyl jasmonate (MeJA) on ethylene production in tomato(Lycopersicon esculentum Mill.) hypocotyl segments and fruits were studied. Ethylene production in tomato hypocotyl segments was inhibited by the increasing concentratons of MeJA, and 450 $\mu$M of MeJA showed 50% inhibitory effect. Time course data indicate that this inhibitory effect of MeJA appeared after 3 h of incubation period and continued until 24 h. Inhibition of ethylene producton by MeJA was due to the decrease in 1-aminocyclopropane-1-carboxylic acid(ACC) synthase activity. However, MeJA treatment had no effect on ACC oxidase activity and the accumulaton of ACC oxidase mRNAs. MeJA also inhibited auxin-induced ethylene production by decreasing in ACC synthase activity. In contrast, MeJA stimulated ethylene production in tomato fruits. When 30 $\mu$L/mL MeJA was treated in a gaseous state, ethylene production doubled and this stimulating effect continued until 4 days. To investigate the mechanisms of MeJA on ethylene production, ACC synthase and ACC oxidase activities were examined after MeJA treatment. MeJA increased the activities of both ACC synthase and ACC oxidase, and induced ACC oxidase mRNA accumulation. These data suggest that MeJA plays distinct roles in the ethylene production in different tomato tissues. It is possible that MeJA affects differently the mechanisms of signal transuction leading to the ethylene biosynthesis.

• Journal of Plant Biotechnology
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• v.50
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• pp.239-247
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• 2023

This study aimed to investigate the efficiency of arbuscular mycorrhizal fungi (AMF) in enhancing plant performance and bioactive compound concentrations in tomatoes (Lycopersicon esculentum Mill.). This factorial pot experiment included nine replications over 120 days of cultivation. Three AMF species (Rhizophagus prolifer, Claroideoglomus etunicatum, and Acaulospora mellea) were utilized as inoculum, while non-mycorrhizal controls with or without synthetic NPK fertilizer were compared. Interestingly, C. etunicatum KS-02 inoculations effectuated the best fruit growth and weight, which were statistically higher than those of the control without AMF. However, only fruit fresh weight was higher in plants inoculated with C. etunicatum KS-02 than those treated with the synthetic NPK fertilizer. In addition, C. etunicatum KS-02 inoculations induced a ≥ 11% increase in DDPH (1,1-diphenyl-2-picrylhydrazyl) activity, lycopene content, and carotenoid content compared to the control. This study is the first to report Claroideoglomus species' effectiveness in promoting growth, fruit yield, and bioactive compound production in L. esculentum Mill. These findings substantiate the significant potential of C. etunicatum KS-02 for tomato cultivation without the adverse effects of excessive synthetic fertilizer use.

• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.212.2-212
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• 1999

No Abstract, See Full Text

• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.205.1-205
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• 1999

No Abstract, See Full Text

• Research in Plant Disease
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• v.19 no.1
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• pp.25-30
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• 2013

Root-knot nematodes (Meloidogyne spp.) are among the main pathogens of greenhouse crops worldwide. Plant resistance is currently the method of choice for controlling these pests. To select resistant tomato against two common species of root-knot nematodes, M. incognita and M. arenaria, 36 commercial tomato (Lycopersicon esculentum Mill.) cultivars were screened. Seventeen tomato cultivars were resistant to both root-knot nematodes: six in cherry tomato, 'Tenten', 'Cadillac', 'Cutti', 'Sweet', 'Ppotto', 'Lycopin-9', eight in globe tomato, 'Lovely 240', 'Dotaerang Dia', 'Cupirang', 'Dotaerang Master', 'Super Dotaerang', 'Dotaerang Season', 'Miroku', 'Hoyong', and three in root stock, 'Special', 'Fighting', and 'Magnet'.

• Proceedings of the Zoological Society Korea Conference
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• 1999.10b
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• pp.218.1-218
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• 1999

No Abstract, See Full Text

• Korean Journal of Plant Tissue Culture
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• v.24 no.1
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• pp.57-61
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• 1997

We investigated changes in the superoxide dismutase (SOD) activity and SOD isoenzyme pattern in suspension cultures of tomato (Lycopersicon esculentum), which were compared with those of intact tomato plants. two grams (fr wt) of cells subcultured at 15-day intervals were inoculated into 50 mL MS medium containing l mg/L 2,4-D and 30 g/L sucrose in a 300 mL flask and maintained at $25^{\circ}C$ in the dark (100 rpm). The cell growth reached a maximum at 20 days after subculture (DAS), followed by a rapid decrease with further cultures. The cell colour changed from white to black from 23 DAS. The intracellular SOD activity (units/g cell dry wt) was significantly increased from 23 DAS and reached a maximum at 28 DAS (52,400 units), followed by a decrease with further cultures, whereas the extracellular SOD activity showed a maximum at 25 DAS (27,800 units/50 mL medium). The total SOD activity per flask showed a maximum at 25 DAS (35,700 units), in which the extracellular SOD activity occupied about 75%. The tomato cultured cells had four SOD isoenzymes and their patterns were well correlated with SOD activity without a qualitative change during the cell cultures. The intact tomato plants had an additional CuZnSOD isoenzyme, showing the different isoenzyme patterns from cultured cells.

• Korean Journal of Environmental Agriculture
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• v.9 no.2
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• pp.143-151
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• 1990

This study was carried out to investigate the influence of different types of nutrient solutions and culture media on the growth and quality of cucumber(Cucumis sativus L.) and tomato(Lycopersicon esculentum Mill.). The results are summarized as follows : 1. The growth and yield of cucumber and tomato were best in rockwool culture with Cooper solution. 2. In sand-sack culture, growth and yield of cucumber and tomato were higher with compound fertillzer solution. 3. Growth and yield of cucumber and tomato were more effective in rockwool culture than in soil culture in early growth stages, and vice versa in later growth stages. 4. Vitamin C contents of cucumber and tomato showed no differences between soil cultures and hydroponics, except rockwool culture with compound fertilizer solution. 5. The dry weight, total-N, and mineral content of cucumber and tomato showed no differences among all types of hydroponics.

• Proceedings of the Korean Society for Bio-Environment Control Conference
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• 2002.04a
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• pp.1-2
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• 2002

토마토의 품질을 향상시키기 위한 처리들이 대부분 수량감소를 동반하는데 수량감소를 최소화하면서 품질을 개선할 수 있는 방법을 구명하기 위하여 해수를 처리하여 토마토의 품질을 향상시킬 수 있는 가능성을 검토하였다. 해수에는 Na와 Cl 이온이 80% 이상을 차지하고, EC가 높기 때문에 NaCl을 대체할 수 있을 뿐만 아니라 근권에 EC를 효과적으로 높일 수 있을 것으로 판단되어 수행하였다. (중략)

• Korean Journal of Food Science and Technology
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• v.18 no.5
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• pp.335-338
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• 1986

A simple spectrophotometric technique using sequential extraction of pigments was attempted to perform color evaluation of raw 'Taimuri' tomato (Lycopersicon esculentum Mill.) fruits. The difference between summed absorbance of 80% acetone and chloroform extract at 480 nm and 660 nm reflected the maturity of rawtomato fruits. The measurement system presented was regarded as a simple and reliable method for objective color evaluation of tomato fruits. It seems possible to predict the degree of puffiness by weight per volume w/v ratio of tomato fruits during various stages of maturity.