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Effect of LED Light Intensity on Seedling Quality and Tuber Production of Potato Stem Cuttings Grown in a Closed-Type Plant Production System

폐쇄형식물생산시스템을 이용한 감자 경삽묘 육묘시 묘소질과 괴경 생산에 대한 LED 광도의 영향

  • Jo, Man Hyun (Seed Management Office, Chungcheongnam-do Agricultural Research and Extension Services) ;
  • Ham, In Ki (Horticulture Research Division, Chungcheongnam-do Agricultural Research and Extension Services) ;
  • Park, Kwon Seo (Seed Management Office, Chungcheongnam-do Agricultural Research and Extension Services) ;
  • Cho, Ji Hong (Highland Agriculture Research Institute, National Institute of Crop Science, Rural Development Administration)
  • 조만현 (충청남도농업기술원 종자관리소) ;
  • 함인기 (충청남도농업기술원 원예연구과) ;
  • 박권서 (충청남도농업기술원 종자관리소) ;
  • 조지홍 (농촌진흥청 국립식량과학원 고령지농업연구소)
  • Received : 2020.06.04
  • Accepted : 2020.09.21
  • Published : 2020.12.01

Abstract

This study was performed to establish light intensity conditions for producing stem cuttings for aeroponic systems suitable for seed potato production using a closed-type plant production system. Shoot tip cultured plantlets of 'Sumi' and 'Chubaek' potato (Solanum tuberosum L.) were acclimatized, cuttings were collected, and stem cuttings were planted. The seedlings were raised for 40 days at different LED light intensities (60, 120, 180, and 240 μmol·m-2·s-1), and were cultivated in an aeroponic system for 80 days. When stem cuttings were raised at 60 μmol·m-2·s-1 LED light intensity, the plant height was the longest, at 17.3 cm for 'Sumi' and 16.1 cm for 'Chubaek', and the number of nodes was the highest in both cultivars. The higher light intensities, produced smaller plants with fewer nodes. The leaf areas, SPAD values, and Fv/Fm values differed slightly between cultivars. The fresh weight of stem cuttings, and the production rate of healthy stem cuttings were the highest at 60 μmol·m-2·s-1. In the aeroponic system, seedlings raised at 60 μmol·m-2·s-1 with LED light intensity showed a difference between the cultivars, but the fresh weight of stems and leaves above the planting plate was the heaviest. In addition, below the planting plate the stem cuttings were longest and the root weight was heaviest at 60 μmol·m-2·s-1 LED light intensity. The number of stolons also differed between cultivars, but was greatest for seedlings raised at 60 μmol·m-2·s-1 LED light intensity, at 4.2/plant for 'Sumi' and 7.7/plant for 'Chubaek'. At 60 μmol·m-2·s-1 LED light intensity, the tuber number and total tuber weight were the best, but the higher the light intensity, the smaller the total tuber number and total tuber weight for both cultivars. In conclusion, when producing potato stem cuttings for aeroponic systems using a closed-type plant production system, the most suitable LED light intensity for raising seedlings was found to be 60 μmol·m-2·s-1.

본 연구는 씨감자 생산에 적합한 분무경재배용 경삽묘를 폐쇄형식물생산시스템을 이용하여 생산하기 위한 광도조건을 설정하기 위하여 수행하였다. 감자(Solanum tuberosum L.) '수미'와 '추백'의 경정배양묘를 순화한 다음 삽수를 채취하여 경삽하였다. 서로 다른 LED 광도(60, 120, 180, 그리고 240 μmol·m-2·s-1)에서 40일간 육묘하고, 80일간 분무경재배하였다. 1. LED 광도 60 μmol·m-2·s-1에서 경삽묘를 육묘하였을 경우 '수미' 17.3 cm, '추백' 16.1 cm로 두 품종 모두 초장이 가장 길었고, 마디수도 많았다. 광도가 높을수록 초장은 작고 마디수도 적었다. 2. 품종에 따라 엽면적이나 SPAD 값, Fv/Fm 값은 육묘기의 광도에 따라 약간의 차이를 보였다. 경삽묘의 생체중은 60 μmol·m-2·s-1 광도에서 가장 무거웠으며, 건전묘 생산율도 두 품종 모두 60 μmol·m-2·s-1 광도에서 가장 높았다. 3. 분무경재배에서 LED 광도 60 μmol·m-2·s-1에서 육묘한 경삽묘가 품종간 차이를 보이기는 하지만 지상부 경엽중이 가장 무거웠고, 정식판 아래 경삽묘장이 가장 길고 뿌리 무게도 가장 무거웠으며, 광도가 높을수록 가벼웠다. 4. 복지수에 있어서도 품종간 차이는 있으나 60 μmol·m-2·s-1 광도에서 육묘한 경우 '수미' 4.2개/주, '추백' 7.7개/주로 가장 많았다. 또한 60 μmol·m-2·s-1 광도에서 괴경수 및 총괴경중이 가장 좋았는데 광도가 높을수록 두 품종의 총괴경수와 총괴경중이 적어지는 경향이었다. 이상의 연구결과를 종합해 보면 폐쇄형식물생산시스템을 이용하여 분무경재배용 경삽묘를 생산할 경우, 육묘에 적합한 LED 광도는 60 μmol·m-2·s-1라고 판단되었다.

Keywords

References

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