• Title/Summary/Keyword: young seedlings

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The Assessment of Photochemical Index of Nursery Seedlings of Cucumber and Tomato under Drought Stress (건조스트레스에 의한 오이와 토마토 공정육묘의 광화학적 지표 해석)

  • Ham, Hyun Don;Kim, Tae Seong;Lee, Mi Hyun;Park, Ki Bae;An, Jae-Ho;Kang, Dong Hyeon;Kim, Tae Wan
    • Korean Journal of Environmental Biology
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    • v.36 no.4
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    • pp.479-487
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    • 2018

  • The purpose of this study is to analyze photochemical activity of nursery seedlings under drought stress, using chlorophyll fluorescence reaction analysis. Young nursery seedlings of tomato (Lycopersicon esculentum Mill.) and cucumber (Cucumis sativa L.), were grown under drought stress for 8 days. Analysis of chlorophyll fluorescence reaction (OJIP) and parameters, were performed to evaluate photochemical fluctuation in nursery seedlings under drought stress. Chlorophyll fluorescence reaction analysis showed maximal recorded fluorescence (P) decreased from the 5 day after treatment in tomato seedlings, while an amount of chlorophyll fluorescence increased at the J-I step. Thus, physiological activity was reduced. In cucumber seedlings, maximal recorded fluorescence (P) and maximal variable fluorescence ($F_V$) lowered from the 4 day after treatment, and chlorophyll fluorescence intensity of J-I step increased. Chlorophyll fluorescence parameter analysis showed electron transfer efficiency of PSII and PSI were significantly inhibited with decreasing $ET2_O/RC$ and $RE1_O/RC$ from the 5 day after treatment, in tomato seedlings and from the 4 day after treatment, in cucumber seedlings. $ET2_O/RC$ and $PI_{ABS}$ significantly changed. In conclusion, 6 indices such as $F_V/F_M$, $DI_O/RC$, $ET2_O/RC$, $RE1_O/RC$, $PI_{ABS}$ and $PI_{TOTAL}ABS$ were selected for determining drought stress in nursery seedlings. Drought stress factor index (DFI) was used to evaluate whether the crop was healthy or not, under drought stress. Cucumber seedlings were less resistant to drought stress than tomato seedlings, in the process of drought stress.

  • https://doi.org/10.11626/KJEB.2018.36.4.479 인용 PDF KSCI

Effect of Water Content in the Substrate of the Scion and Rootstock during Pre- and Post-Grafting Period on the Survival Rate and Quality of Tomato Plug Seedlings (접목 전후 대목과 접수의 상토 내 수분함량이 토마토 플러그묘의 접목 활착율과 묘소질에 미치는 영향)

  • Vu, Ngoc-Thang;Choi, Ki Young;Kim, Il-Seop
    • Journal of Bio-Environment Control
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    • v.23 no.3
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    • pp.199-204
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    • 2014

  • This study evaluated the effect of water content in the substrate during pre- and post-grafting period on the survival rate and quality of tomato plug seedlings. Nine combinations of three water levels (high, medium, and low) were set up in the substrate of both scion and rootstock. The water content in the substrate of the scion did not affect the survival rate of grafted tomato seedlings, while the survival rate was statically different among the various water contents in the substrate of the rootstock. The maximum survival rates (100%) were observed in seedlings treated with high water levels in the substrate of the rootstock, and the survival rates declined with decreasing water content in the rootstock substrate. The growth characteristics were not significantly affected by different water content in the scion substrate, while they were statically different among the seedlings treated with various water contents in the rootstock substrate. The growth characteristics decreased with decreasing water content in the rootstock substrate. The highest value of compactness was observed in grafted seedlings, which combined medium water level in the scion and high water level in the rootstock substrate treatment. The root morphology of tomato seedlings was also affected by water content in the rootstock substrate. The total root surface area, total root length, and number of root tips decreased with deceasing water content in the rootstock substrate.

  • https://doi.org/10.12791/KSBEC.2014.23.3.199 인용 PDF KSCI

Effects of Seed Soaking Treatment of Diniconazol on the Inhibition of Stretching of Tomato and Cucumber Seedlings (Diniconazol의 종자침지 처리가 토마토와 오이 플러그묘의 도장억제에 미치는 영향)

  • Sun, Eun-Sun;Kang, Ho-Min;Kim, Young-Shik;Kim, Il-Seop
    • Journal of Bio-Environment Control
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    • v.19 no.1
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    • pp.55-62
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    • 2010

  • This study was conducted to find out the effect of diniconazole treatment by seed soaking on the stretching of tomato and cucumber seedlings. The emergence rate of tomato and cucumber seed was decreased as diniconazole concentration was higher and soaking period was longer. The emergence rate of tomato seedlings was lower as the soaking period was longer in $1mg{\cdot}L^{-1}$ concentration treatments, although there was no significant difference. The other concentration treatment (10, 50, and $100mg{\cdot}L^{-1}$) reduced emergence rate of tomato seedlings outstandingly in higher concentration and longer treated period, but 90% of treated seeds emerged at 10 days after sowing. As the concentration of diniconazol was higher and soaking period was longer, plant height and growth rate of seedlings were retarded. There covery of internodes growth was faster in lower concentration and shorter soaking period. The top and root fresh weight and dry weight of tomato and cucumber seedlings was not influenced by $1mg{\cdot}L^{-1}$ concentration, but these growth characteristics were reduced in higher concentration and longer soaking period. The dwarfed cucumber seedlings treated by diniconazol showed normal growth rate after planting and their male and female flower was set normally. These results suggest that the proper concentration and soaking period of diniconazol may be $10mg{\cdot}L^{-1}$ concentration for 12 hours in tomato seed, and $1mg{\cdot}L^{-1}$ concentration for 24 hours in cucumber seed.

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