Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Characterization of Toxicity Symptom and Determination of Tissue Threshold Levels of Boron for Diagnostic Criteria in Domestically Bred Strawberries

국내육성 주요 딸기 품종에서 발생하는 붕소 과잉 증상 및 영양진단을 위한 식물체 내 한계농도

  • Choi, Jong-Myung (Department of Horticulture, Chungnam National University) ;
  • Nam, Min-Ho (Department of Horticulture, Chungnam National University) ;
  • Kim, Dae-Young (Vegetable Research Division, National Institute of Horticultural & Herbal Science)
  • 최종명 (충남대학교 농업생명과학대학 원예학과) ;
  • 남민호 (충남대학교 농업생명과학대학 원예학과) ;
  • 김대영 (국립원예특작과학원 채소과)
  • Received : 2011.09.04
  • Accepted : 2012.01.04
  • Published : 2012.04.30
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Abstract

Diagnosis of nutrient disorders in cultivating crops is based on the visual symptoms and results of soil and plant analysis. This study was carried out to investigate the influence of B concentrations in fertilizer solution on the growth of and nutrient uptake by domestically bred strawberries. Tissue analysis based on the dry weight were also conducted to determine the threshold levels in plants when toxicity developed in boron. The growth was seriously restricted in the three strawberry cultivars as the B concentrations in fertilizer solution were elevated. The fresh and dry weights were heavier and crown diameters were thicker in the 0.25 mM boron treatment than the other treatments tested. The toxicity symptoms of boron appeared on the older leaves of three strawberry cultivars while interveinal chlorosis symptoms appeared on the young leaves of 'Keumhyang' and 'Seolhyang' strawberries. The toxicity symptoms in lower leaves were developed when B concentrations in fertilizer solution were higher than 2 mM in 'Keumhyang' and 0.5 mM in 'Maehyang' and 'Seolhyang' strawberries. The elevated boron concentrations in fertilizer solution did not influence the tissue K, Ca, and Mg contents, but influenced the phosphorus contents with decreasing tendency. The tissue Fe and Zn contents decreased and increased, respectively, as the B concentrations in fertilizer solution were elevated. When the concentration of boron at which the growth of a plant is retarded by 10% is regarded as a upper threshold level, the boron contents based on dry weight of above ground plant tissue should be lower than 25.1, 44.2, and 62.5 $mg{\cdot}kg^{-1}$ in 'Keumhyang', 'Maehyang', and 'Seolhyang' strawberries, respectively.

미량원소인 붕소(B)의 시비농도를 인위적으로 조절한 관비용액으로 '금향', '매향' 및 '설향' 딸기를 재배하면서 시비수준이 생육에 미치는 영향, 생육을 우수하게 유지할 수 있는 식물체의 한계농도, 그리고 B 과잉시비로 유발되는 생리장해의 특징을 구명하기 위하여 본 연구를 수행하였다. 0.25mM B 시비구에서 세 종류 딸기 품종의 생체중 및 건물 중이 가장 무거웠고 관부직경도 가장 굵었지만 B 시비농도가 높아짐에 지상부 생장량이 급격하게 감소하였다. B가 과다하게 시비되면 신생엽에서는 황화현상, 중간에 위치한 잎들에서는 잎 가장자리의 갈변 및 괴사현상, 그리고 하위엽들이 괴사하면서 안쪽으로 말리는 증상이 나타났다. 하위엽에서 나타나는 증상은 '금향'의 경우 2mM 이상의 처리구, '매향'과 '설향'은 0.5mM 이상의 시비구에서 잎 선단부의 갈변 및 괴사, 그리고 잎 내부에 갈변 및 괴사현상이 나타났다. B 시비농도가 증가하여도 다량원소중 양이온인 K, Ca 및 Mg 함량에는 차이가 나타나지 않았으며, 음이온인 인산 함량이 감소하는 경향을 나타냈다. B 시비농도가 증가할 때 '금향'과 '설향' 딸기에서 Fe 함량이 감소하였으며, Zn 함량이 증가하는 경향을 보였다. 건물중에 기초한 지상부 생장량의 90%와 이 때의 B 함량을 정상생육을 위한 최대한계점으로 간주할 때 '금향', '매향' 및 '설향' 딸기에서 식물체내 B 함량이 각각 25.1, 44.2 및 $62.5mg{\cdot}kg^{-1}$ 이하를 유지하도록 B 시비농도를 조절하여야 과잉피해를 방지할 수 있다고 판단하였다.

Keywords

References

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